JP2016073151A - Voltage regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage regulator which prevents a voltage of a distribution line from being deviated from a proper range by variations in a power generation amount supplied by a wind power generation device.SOLUTION: A voltage regulator 400 is configured to regulate a voltage of a distribution line system-interlocked with the wind power generation device by controlling a target voltage of a voltage outputted to a secondary side by a transformer for voltage regulation. The voltage regulator includes: a power generation amount prediction part 412 for calculating a prediction value of the power generation amount of the wind power generation device on the basis of a prediction value of a wind speed at an installation position of the wind power generation device and a power generation property indicating a relation between the wind speed and the power generation amount of the wind power generation device; a target voltage calculation part 413 for calculating the target voltage on the basis of the prediction value of the power generation amount of the wind power generation device and a voltage variation property indicating a relation between the power generation amount and a shift controlled variable of the transformer for voltage regulation; and an instruction part 414 for controlling the transformer for voltage regulation in such a manner that the voltage outputted to the secondary side becomes closer to the target voltage.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a voltage regulator.

  In recent years, the introduction of power generation systems using natural energy has progressed, and wind power generators and solar power generators have been built in various places. In a power generation system using natural energy, the amount of power generation changes rapidly in response to changes in natural phenomena, so the voltage of the distribution line in the distribution system must be maintained within an appropriate range (the voltage of the low-voltage distribution line is 101 ± 6 V). However, it has a problem that it is difficult. In particular, when a wind power generator or a solar power generator is installed in various places as a distributed power source, the amount of power generated from the distributed power source significantly affects the voltage increase and voltage drop of the distribution line. Under such circumstances, as a countermeasure for stabilizing the voltage of the distribution line, a method of measuring the voltage of the distribution line at various locations and adjusting the voltage is used (for example, see Patent Document 1).

JP 2004-056331 A

  Generally, in order to adjust the voltage of the distribution line, a voltage adjusting transformer (for example, a load tap changing transformer) is used, but in order for the voltage adjusting transformer to switch the tap, several tens of seconds are used. The voltage adjusting transformer has a problem that it cannot cope with a sudden voltage change. And since the wind speed and the wind direction used for wind power generation have a large fluctuation within a day, the method of measuring the voltage of the distribution line at each point as in Patent Document 1 follows the fluctuation speed of the power generation amount of wind power generation. There is a risk that the voltage of the distribution line may temporarily deviate from the appropriate range.

  Then, an object of this invention is to provide the voltage regulator which prevents the deviation from the appropriate range of the voltage of a distribution line resulting from the fluctuation | variation of the electric power generation amount supplied by a wind power generator.

  The main present invention that solves the above-mentioned problems is a voltage adjustment that adjusts the voltage of the distribution line that is connected to the wind power generator by controlling the target voltage of the voltage that the voltage adjustment transformer outputs to the secondary side. Calculate the predicted value of the power generation amount of the wind turbine generator based on the predicted value of the wind speed at the installation position of the wind turbine generator and the power generation characteristics indicating the relationship between the wind speed and the power generation amount of the wind turbine generator The target voltage for calculating the target voltage based on the power generation amount prediction unit, the predicted value of the power generation amount of the wind power generator, and the voltage fluctuation characteristic indicating the relationship between the power generation amount and the shift control amount of the voltage adjustment transformer A voltage adjustment device comprising: a calculation unit; and an instruction unit that controls the voltage adjustment transformer so that a voltage output to the secondary side approaches a target voltage. Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the voltage regulator according to the present invention, the target voltage of the voltage regulating transformer can be set in advance based on fluctuations in the amount of power generated by the wind turbine generator due to changes in wind speed. Thereby, the deviation from the appropriate range of the voltage of the distribution line due to the fluctuation of the power generation amount supplied by the wind turbine generator can be prevented.

It is a figure which shows the structure of the electric power grid | system in 1st Embodiment of this invention. It is a figure which shows the structure of the transformer for line voltage adjustment in 1st Embodiment of this invention. It is a figure which shows the structure of the voltage regulator in 1st Embodiment of this invention. It is a figure which shows the structure of the weather forecast data in 1st Embodiment of this invention. It is a figure which shows the electric power generation characteristic data in 1st Embodiment of this invention. It is a figure which shows the voltage fluctuation characteristic data in 1st Embodiment of this invention. It is a figure which shows the relationship between the electric power generation amount of the wind power generator in 1st Embodiment of this invention, a shift control amount, and a target voltage. It is a figure explaining the operation | movement flow of the voltage regulator in 1st Embodiment of this invention. It is a figure explaining the target voltage in 1st Embodiment of this invention. It is a figure which shows the structure of the voltage regulator in 2nd Embodiment of this invention. It is a figure which shows the structure of the electric power generation performance data in 2nd Embodiment of this invention. It is a figure which shows the structure of the weather forecast data (for the past) in 2nd Embodiment of this invention.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

<First Embodiment>
=== About power system configuration ===
In this embodiment, the voltage regulator predicts the power generation amount of the wind turbine generator based on the predicted value of the wind speed, and the voltage regulator is used to adjust the voltage of the distribution line connected to the wind turbine generator in advance. By calculating the target voltage, it is possible to deal with voltage fluctuations in the distribution line accompanying fluctuations in the amount of power generated by the wind turbine generator. The configuration of the voltage regulator and details of the operation by the voltage regulator will be described later.

  Hereinafter, an example of the configuration of the power system in the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 shows an example of a power system according to the present embodiment. The electric power system which concerns on this embodiment becomes a structure which transmits to the downstream consumers R1-R4 via the high voltage bus-line LL and the high voltage distribution line L1 from the system voltage adjustment transformer 100 of a connection substation. Yes. In addition, the power system according to the present embodiment is connected to the wind power generator G1 in the high voltage distribution line L1, and the voltage fluctuation of the high voltage distribution line L1 by the wind power generation apparatus G1 is controlled by the voltage regulator 400. The voltage adjustment transformer 100, the line voltage adjustment transformer 200, and the power capacitor 300 are used for adjustment (the dotted line in FIG. 1 represents a signal path). 1, points A, B, D, E, F, G are branched from the high-voltage distribution line L1 on the way from the upstream side to the downstream side near the system voltage adjusting transformer 100. Represents the point to be

  The system voltage adjusting transformer 100 is a device that is installed in the interconnection substation and that controls the transformation ratio by the voltage relay 110 and adjusts the overall voltage of the high-voltage distribution line on the downstream side. The system voltage adjusting transformer 100 is, for example, a transformer with a load tap changer, and a high-voltage (for example, 110 kV) electric power received from a generator or other substation (not shown). , 6.6 kV), and transmits power to the high-voltage wiring line L1 and other distribution lines (not shown) via the high-voltage bus LL. Then, the system voltage adjusting transformer 100 monitors the voltage output to the secondary side by the system voltage adjusting transformer 100 (hereinafter referred to as “the output voltage of the system voltage adjusting transformer 100”). In response to an instruction from, the downstream voltage is adjusted by changing the transformation ratio by tap switching.

  The voltage relay 110 (not shown) detects the output voltage of the system voltage adjusting transformer 100 via an instrument transformer (not shown), and the output voltage of the system voltage adjusting transformer 100 is detected. It is an apparatus for controlling the system voltage adjusting transformer 100 so as to approach the target voltage. The output voltage of the system voltage adjusting transformer 100 is adjusted by controlling the target voltage of the voltage relay 110 by the voltage adjusting device 400 (details will be described later).

  The high-voltage distribution line L1 is a downstream-side electric wire transmitted by the system voltage regulating transformer 100, and is extended by a steel tower in each region. The high-voltage distribution line L1 converts high-voltage (6.6 kV) power received from the interconnection substation into low-voltage (100 V) power via pole transformers Tr1 to Tr4. The power is transmitted to the consumers R1 to R4 in each region. The high-voltage distribution line L1 and the low-voltage distribution line are three-phase three-wire electric wires that transmit three-phase AC power.

  The pole transformers Tr1 to Tr4 have a high voltage distribution line L1 connected to the high voltage side and a low voltage distribution line connected to the low voltage side. For example, the high voltage of 6.6 kV and the low voltage of 100 V are mutually transformed. . The pole transformers Tr1 to Tr4 branch off from the points A, B, D, and G of the high-voltage distribution line L1 and supply power to the consumers R1 to R4.

  The consumers R1 to R4 have, for example, home appliances and induction motors as power loads, and use the power received by the low-voltage distribution lines via the pole transformers Tr1 to Tr4 for those power loads. In addition, the transformation ratio of the pole transformers Tr1 to Tr4 is fixed to a constant value, and when the voltage fluctuation occurs in the high voltage distribution line L1, the voltage of the low voltage distribution line used by the consumers R1 to R4 also fluctuates. It will adversely affect the home appliances and induction motors used. The transformation ratios of the pole transformers Tr1 to Tr4 are set so that the supply voltage to the low-voltage distribution line is in an appropriate range (101 ±±) in consideration of the voltage drop of the power transmitted from the system voltage adjustment transformer 100 in normal times. 6V).

  The power capacitor 300 is a phase adjusting facility that is connected to point E on the downstream side of the high-voltage distribution line L1 and adjusts the voltage of the high-voltage distribution line L1 by changing the input state. The power capacitor 300 supplies a reactive power delayed to the high voltage distribution line L1 by closing the switch between the high voltage distribution line L1 and the high voltage distribution line L1. Prevent voltage drop.

  The power capacitor 300 includes a control unit including a CPU and the like, a storage unit including a non-volatile memory and a volatile memory, and a communication unit including a communication controller and the like. Is possible. And according to the instruction | indication signal from the voltage regulator 400, the switch between high voltage distribution lines L1 is controlled, and the insertion state of a capacitor | condenser is changed.

  The wind power generator G1 is a device that generates power using wind power and transmits the generated power toward the point F of the high-voltage distribution line L1. Specifically, the wind power generator G1 changes the force of the wind blown to the position where the wind power generator G1 is installed to the rotational force of the propeller, and rotates the bearing around which the conductive wire is wound in a magnetic field, thereby Generates electromotive force in the conductor and generates electricity. And wind power generator G1 converts the generated electric power into alternating current power of a predetermined frequency (for example, 60 Hz) with a power conditioner, and transmits it toward F point of high voltage distribution line L1. The wind power generator G1 is configured to be capable of generating power regardless of the wind direction because yaw control is performed to follow the direction of the propeller to the wind direction.

  FIG. 2 shows an example of a line voltage adjusting transformer 200 according to this embodiment. The line voltage adjusting transformer 200 is a device that is installed at the point C of the high-voltage distribution line L1 and that controls the voltage transformation ratio by the voltage relay 210 and adjusts the voltage on the downstream side thereof. The line voltage adjusting transformer 200 is, for example, a transformer with a load tap changer, receives high-voltage (for example, 6.5 kV) power from the upstream side of the high-voltage distribution line L1, and the downstream voltage is appropriate. The voltage is transformed so as to maintain a value (for example, 6.6 kV), and is transmitted downstream. In FIG. 2, only a single-phase transformer for one phase of the three-phase distribution lines is shown, but the line voltage adjusting transformer 200 has a primary side and a secondary side for the three-phase wires. Each is composed of a Y-connection, and each of the three phases is provided with a single transformer, and the three-phase taps are collectively switched so that each phase has the same level.

  The voltage relay 210 is, for example, a digital voltage relay, and the voltage output to the secondary side by the line voltage adjusting transformer 200 via the instrument transformer PT (hereinafter referred to as “the output of the line voltage adjusting transformer 200”). This is a device that controls the line voltage adjusting transformer 200 so that the output voltage of the line voltage adjusting transformer 200 approaches the target voltage. In addition, the voltage relay 210 is configured to perform data communication with the voltage regulator 400 so that a reference target voltage is controlled by the voltage regulator 400.

The voltage relay 210 includes a control unit configured by a CPU, a storage unit configured by a nonvolatile memory, a volatile memory, and the like, and a communication unit configured by a communication controller, and the control unit executes a predetermined program. In this way, various functions are realized. Specifically, the voltage relay 210 converts the voltage detected via the instrument transformer PT into an appropriate voltage via the input signal conversion circuit, and acquires it as digital information via the A / D conversion circuit. And a reference voltage (target voltage +0.5 V (upper limit value), target voltage -0.5 V (lower limit value)). When the detected voltage is larger than the upper limit value of the target voltage, an instruction signal for one tap reduction is output to the line voltage adjusting transformer 200, and the detected voltage is lower than the lower limit value of the target voltage. When the output voltage is small, the line voltage adjusting transformer 200 outputs a one-tap instruction signal to the line voltage adjusting transformer 200 so that the output voltage of the line voltage adjusting transformer 200 approaches the target voltage. 200 is controlled.

  At this time, the voltage relay 210 performs data communication with the voltage regulator 400 and sets the target voltage according to the adjustment instruction. In other words, the voltage adjustment device 400 controls the reference target voltage, thereby enabling voltage adjustment according to the predicted value of the wind speed, that is, according to the predicted value of the power generation amount of the wind power generator G1.

  In the present embodiment, the voltage adjustment of the line voltage adjusting transformer 200 will be mainly described in order to adjust the voltage at the point G where the voltage fluctuation is large. However, the voltage relay 110 has the same configuration as the voltage relay 210. The output voltage of the system voltage adjusting transformer 100 can be adjusted by the control of the voltage adjusting device 400.

  Based on the predicted value of the wind speed, the voltage regulator 400 calculates the target voltage of the line voltage regulator 200, the target voltage of the system voltage regulator 100, and the input plan of the power capacitor 300, based on these. The device controls each device (details of the configuration and operation of the voltage regulator 400 will be described later). Thereby, the line voltage adjusting transformer 200 and the system voltage adjusting transformer 100 can perform the tap switching before the voltage fluctuation caused by the fluctuation of the power generation amount of the wind power generator G1 occurs.

=== Configuration of voltage regulator ===
Hereinafter, with reference to FIGS. 3 to 6, the configuration of the voltage regulator in the present embodiment will be described.

  FIG. 3 shows an example of the configuration of the voltage regulator 400 according to the present embodiment. The voltage adjustment device 400 is a computer including a control unit 410, a storage unit 420, a communication unit 430, an input unit 440, and a display unit 450.

The control unit 410 performs data communication with the hardware configuring the storage unit 420, the communication unit 430, the input unit 440, and the display unit 450 via a bus (not shown) and controls their operation. Further, the control unit 410 calculates the predicted value of the power generation amount of the wind power generator G1 and functions as a function for calculating the target voltage for adjusting the voltage of the high-voltage distribution line L1, as an acquisition unit 411, a power generation amount prediction unit. 412 and functions of a target voltage calculation unit 413 and an instruction unit 414 (details will be described later). The control unit 410 is realized, for example, when the CPU executes a computer program stored in the storage unit 420.
The storage unit 420 has an area for storing weather forecast data 421, power generation characteristic data 422, voltage fluctuation characteristic data 423, power system data 424, a computer program 425, and intermediate data of arithmetic processing (details will be described later). The storage unit 420 includes, for example, a nonvolatile memory (magnetic disk, flash memory, ROM), and volatile memory (RAM).

  The communication unit 430 is connected to the voltage relay 210 (for the line voltage adjustment transformer 200), the voltage relay 110 (for the system voltage adjustment transformer 100), the power capacitor 300, and the weather information providing apparatus 500 via the communication line 600. Data communication with. The communication unit 430 is configured by, for example, a communication controller, and performs data communication with these devices via a LAN (communication line 600).

  When the user of the voltage adjustment device 400 inputs data, the input unit 440 causes the storage unit 420 to store the input content. The input unit 440 is configured by a keyboard, for example.

  The display unit 450 displays the result of the arithmetic processing by the control unit 410 such as the predicted value of the power generation amount so that it can be identified to the user of the voltage regulator 400. The display unit 450 is configured by a liquid crystal display, for example.

= Data structure of the storage unit =
Here, weather forecast data 421, power generation characteristic data 422, voltage fluctuation characteristic data 423, and power system data 424 included in the storage unit 420 of the voltage regulator 400 will be described.

  The weather forecast data 421 is data relating to wind speed prediction values stored in association with date / time information. FIG. 4 shows an example of the configuration of the weather forecast data 421 according to the present embodiment. The weather forecast data 421 stores hourly predicted values related to wind speed, wind direction, atmospheric pressure, temperature, and humidity at a position where the wind power generator G1 is installed in a table format in association with date / time information. .

  As the weather prediction data 421, for example, meso numerical prediction model GPV (Grid Point Value) data (hereinafter referred to as “GPV data”), which is one of numerical prediction data provided by the Japan Meteorological Agency, can be used. The GPV data used in this embodiment divides the latitude between 22.4 ° and 47.6 ° north by 0.05 ° intervals (505 grids) and 0.0625 between 120 ° and 150 ° east longitude. GPV data on the ground surface (10 m altitude) was numerically calculated based on meteorological satellite data, etc. for each grid point on a mesh of about 5 km per side formed by dividing at an angle interval (481 grid). Is. The Japan Meteorological Agency creates GPV data up to 33 hours ahead at an interval of one hour and stores it in the weather information providing apparatus 500. The weather information providing apparatus 500 is a computer that transmits weather prediction data in response to a request from the voltage adjustment apparatus 400, for example.

  The voltage adjusting device 400 receives GPV data 24 hours ahead from the weather information providing device 500 via the communication line 600 and stores it as weather forecast data 421.

In addition, the predicted value of the wind speed of the GPV data stored in the weather forecast data 421 is a vector value of the component W _{X in} the east-west direction (positive in the east direction) and the component W _{Y in the} north-south direction (positive in the north direction) of 10 m above the ground. It is. Therefore, the control unit 420 performs various arithmetic processes by converting the wind speed of the GPV data into the height of the nacelle of the wind power generator G1 by the following formulas (1A) and (1B).

（但し、Ｗ₁₀は地上高１０ｍにおける風速、Ｗ_nはナセルの高さにおける風速、Ｚ_nは地表面からナセル中心までの高さ、Ｚ₁₀は基準高度である１０ｍ、Ｂは周囲環境によって定まる定数（例えば森林の場合Ｂ＝５、海の場合Ｂ＝７）を表す）
ここで、式（１Ａ）は、ＧＰＶデータの風速の予測値の東西方向の成分Ｗ_Xと南北方向の成分Ｗ_Yのベクトルから、スカラー値としての風速（Ｗ₁₀）を算出する式である。又、式（１Ｂ）は、地上１０ｍ風速（Ｗ₁₀）から、風力発電装置Ｇ１のナセルの高さＺ_nにおける風速Ｗ_nに変換する式である。

(W ₁₀ is the wind speed at a height of 10 m above ground, W _n is the wind speed at the height of the nacelle, Z _n is the height from the ground surface to the center of the nacelle, Z ₁₀ is the reference altitude 10 m, and B is determined by the surrounding environment. Constant (for example, B = 5 for forest, B = 7 for sea)
Here, the expression (1A) is an expression for calculating the wind speed (W ₁₀ ) as a scalar value from the vector of the east-west direction component W _X and the north-south direction component W _Y of the predicted wind speed value of the GPV data. The equation (1B) is an equation for converting the wind speed (W ₁₀ ) 10 m above the ground into the wind velocity W _n at the height Z _n of the nacelle of the wind power generator G1.

  The power generation characteristic data 422 is data relating to the power generation characteristics serving as a reference for the wind turbine generator G1. FIG. 5 shows an example of the relationship (power generation characteristics) between the wind speed and the amount of power generated by the wind turbine generator. Here, the horizontal axis of FIG. 5 represents the wind speed (m / s) of the wind toward the propeller at the height of the nacelle of the wind power generator G1, and the vertical axis represents the power generation amount of the wind power generator G1. The power generation amount of the wind power generator G1 means output power (kW) or a product of output power (kW) and power generation time (kW · s) (hereinafter the same).

In the power generation characteristic data 422, when the wind speed is equal to or lower than the cut-in wind speed (3 m / s in the drawing), the propeller is locked, and the power generation amount (power generation output) by the wind power generator G1 is almost zero. When the wind speed is equal to or higher than the cut-in wind speed (3 m / s in the drawing), the power generation of the wind power generator G1 is started, and the power generation amount of the wind power generator G1 gradually increases as the wind speed increases. When the wind speed becomes equal to or higher than a certain value (13 m / s in the figure), the wind power generator G1 shifts to the rated output operation for stabilizing the power generation amount.
When there are a plurality of wind power generators, the power generation characteristic data 422 is preferably stored for each type of wind power generator or for each wind power generator. This is because the power generation characteristics of the wind turbine generator differ depending on the type of propeller type, Darrieus type, etc., and also differ depending on the design standard such as the propeller size. The power generation characteristic data 422 may be stored in any format. For example, the power generation output by wind power generation corresponding to every 0.1 m / s between 0 to 30 m / s is stored as table data. Keep it.

  The voltage fluctuation characteristic data 423 is data indicating the relationship between the target voltage to be changed in the line voltage adjusting transformer 200 and the system voltage adjusting transformer 100 in accordance with the amount of power generated by the wind turbine generator G1. FIG. 6 is a graph showing an example of the voltage fluctuation characteristic data 423 according to the present embodiment. FIG. 6 shows the relationship between the power generation amount (kW) of the wind power generator G1 and the amount by which the target voltage of the line voltage adjusting transformer 200 should be reduced (hereinafter referred to as “shift control amount”). In addition, the horizontal axis of FIG. 6 represents the power generation amount (kW) of the wind power generator G1, and the vertical axis represents the shift control amount (V) of the line voltage adjusting transformer 200.

  The voltage fluctuation characteristic data 423 is set based on the power system of the distribution line connected to the wind power generator G1. In the present embodiment, since the wind power generator G1 is connected to the point F of the high-voltage distribution line L1, for example, by calculating the voltage fluctuation at the point F accompanying the power generation of the wind power generator G1, the shift control amount is calculated. Can be calculated. In this case, the shift control amount includes the power generation amount (output power) of the wind power generator G1, the line impedance of the high-voltage distribution line L1, the voltage at the F point of the high-voltage distribution line L1 (target voltage) and the power load of the high-voltage distribution line L1 ( It can be calculated by the following equation (2) based on a coefficient obtained from the predicted value of the power load).

尚、式（２）は、シフト制御量の算出方法の一例であって、周知の潮流計算により、他の方法によっても算出することが可能である。そして、線路電圧調整用変圧器２００の目標電圧は、風力発電装置Ｇ１の発電量を考慮しない場合（発電量がゼロのとき）の予測目標電圧から、電圧変動特性データ４２３により算出したシフト制御量を減算することにより算出することができる。図７に、風力発電装置Ｇ１の発電量、目標電圧、シフト制御量の関係の一例を示す。尚、風力発電装置Ｇ１の発電量を考慮しない場合（発電量がゼロのとき）の予測目標電圧は、例えば、予測対象の日時における電力需要量、高圧配電線Ｌ１のＧ点の電圧、高圧配電線Ｌ１の線路インピーダンス、高圧配電線Ｌ１の電力負荷等に基づいて、周知の潮流計算により算出することができる。

Note that equation (2) is an example of a method for calculating the shift control amount, and can be calculated by other methods by well-known power flow calculation. Then, the target voltage of the line voltage adjusting transformer 200 is the shift control amount calculated from the voltage fluctuation characteristic data 423 from the predicted target voltage when the power generation amount of the wind power generator G1 is not considered (when the power generation amount is zero). Can be calculated by subtracting. FIG. 7 shows an example of the relationship between the power generation amount, the target voltage, and the shift control amount of the wind turbine generator G1. Note that the predicted target voltage when the power generation amount of the wind power generator G1 is not considered (when the power generation amount is zero) is, for example, the power demand amount at the prediction date and time, the voltage at the G point of the high-voltage distribution line L1, the high-voltage distribution Based on the line impedance of the electric wire L1, the power load of the high-voltage distribution line L1, and the like, it can be calculated by a known power flow calculation.

  Similarly, the voltage fluctuation characteristic data 423 also includes data indicating the relationship between the power generation amount of the wind power generator G1 and the shift control amount of the system voltage adjusting transformer 100 (not shown). The voltage fluctuation characteristic data 423 may be stored in the form of an arithmetic expression so as to be able to calculate the shift control amount from the power generation amount (W) of the wind turbine generator G1, or may be stored as table data. .

  The power system data 424 (not shown) is data relating to the power system, the target voltage calculated at each point based on the power demand, the distribution lines in the power system, and the devices installed in the power system. Specifically, the power system data 424 is based on the current power system that transmits power from the most upstream generator (not shown) to consumers at each point, or when the power system is switched when an accident occurs. It has data about the power system. The power system data 424 is data relating to the line impedance of the distribution line in the power system, the installation position of the circuit breaker (not shown) in the distribution line, the installation position of the pole transformers Tr1 to Tr4 in the distribution line, and the transformation ratio. Have Further, the power system data 424 includes a connection position on the distribution line of the wind power generator G1 and an installation position (longitude / latitude information, predetermined area) of the wind power generator G1 for referring to a predicted value of the wind speed according to the wind power generator G1. Data corresponding to mesh information, etc. when divided by mesh. Further, the power system data 424 includes data relating to the connection position of the power capacitor 300 in the distribution line, the input state, the input possible capacity, and the like. The power system data M4 includes data related to the communication address of each device in order to communicate with each device via the communication line 600. The power system data 424 stores these pieces of information for each device in association with the device identification information of each device.

  In addition, the power system data 424 includes data on the proper voltage to be maintained at each point of the high voltage distribution line L1 in order to keep the voltage of the distribution line in the power system in an appropriate range (the voltage of the low voltage distribution line is 101 ± 6V). Have.

= Various functions of the control unit =
Next, the acquisition unit 411, the power generation amount prediction unit 412, the target voltage calculation unit 413, and the instruction unit 414 included in the control unit 410 of the voltage regulator 400 will be described.

  The acquisition unit 411 has a function of performing data communication with the weather information providing apparatus 500 and acquiring weather prediction data from the weather information providing apparatus 500 at a predetermined timing (for example, every hour). Then, the acquisition unit 411 stores the weather prediction data acquired from the weather information providing apparatus 500 as the weather prediction data 421. In addition, the acquisition part 411 will also acquire the said weather prediction data from the weather information provision apparatus 500, if there is the updated latest weather prediction data among the weather prediction data of the prediction target date and time, Update to the latest weather forecast data.

  The power generation amount prediction unit 412 has a function of calculating a predicted value of the power generation amount of the wind speed power generation device G1 based on the predicted value of the wind speed of the weather prediction data 421 and the power generation characteristic data 422 of the wind speed power generation device G1.

  The target voltage calculation unit 413 is based on the predicted value of the power generation amount of the wind power generator G1 calculated by the power generation amount prediction unit 412 and the voltage fluctuation characteristic data 423, and the line voltage adjustment transformer 200 and the system voltage adjustment This is a function for calculating the target voltage of the transformer 100. In addition, the target voltage calculation unit 413 calculates a charging plan for the power capacitor 300 based on the predicted value of the power generation amount of the wind power generator G1.

  The instruction unit 414 reaches the time zone based on the target voltage of the line voltage adjustment transformer 200 and the system voltage adjustment transformer 100 calculated by the target voltage calculation unit 413, and the charging plan of the power capacitor 300. This is a function to control each device accordingly.

=== About the operation of the voltage regulator ===
Hereinafter, the operation of the voltage regulator 400 will be described with reference to FIGS. S1 to S5 in FIG. 8 represent steps that the control unit 410 of the voltage regulator 400 sequentially executes in accordance with the computer program. Here, since the voltage fluctuation occurs according to the power generation amount of the wind power generator G1 particularly in the distribution line voltage at point G on the downstream side, the operation of the line voltage adjusting transformer 200 will be mainly described. To do.

  S1 is a step of performing an initial setting related to the power system. In this step, the voltage adjustment device 400 calculates the target voltage of the line voltage adjustment transformer 200 and the system voltage adjustment transformer 100, and calculates the input plan of the power capacitor 300. Based on the current power system (connection position and the like in the distribution line of each device), the predicted value of power demand for the prediction date and time, the line impedance of the high voltage distribution line L1, the appropriate voltage at each point of the high voltage distribution line L1, The input capacity of the power capacitor 300 is set. Here, initial setting of variables necessary for the arithmetic processing is performed.

  At this time, the voltage adjustment device 400 predicts when the power generation amount of the wind power generation device G1 is not taken into account (when the power generation amount is zero) based on the predicted value of the power demand amount at the prediction target date and time. The prediction target voltage used as the reference | standard of the line voltage adjustment transformer 200 grade | etc., In the target date is calculated. That is, in this embodiment, a value obtained by subtracting the shift control amount from the predicted target voltage is calculated as a normal target voltage. The predicted target voltage is a well-known value based on, for example, the amount of power demand at the date of prediction, the voltage at point G of the high-voltage distribution line L1, the line impedance of the high-voltage distribution line L1, the power load of the high-voltage distribution line L1, etc. It can be calculated by tidal current calculation.

  S <b> 2 is a step in which the acquisition unit 411 acquires the weather prediction data 421 from the weather information providing apparatus 500. In this step, the acquisition unit 411 acquires weather prediction data (predicted value of wind speed) of the prediction target date and time at the installation position of the wind power generator G1 from the weather information providing device 500, and stores it as the weather prediction data 421.

  S3 is a step in which the power generation amount prediction unit 412 calculates a predicted value of the power generation amount of the wind turbine generator G1. In this step, the power generation amount prediction unit 412 generates the power generation amount of the wind power generator G1 based on the predicted value of the wind speed of the prediction target date and time acquired in the step S2 and the power generation characteristic data 422 of the wind power generator G1. The predicted value of is calculated. That is, the power generation amount prediction unit 412 converts the predicted value of the wind speed at the prediction target date and time into the predicted value of the power generation amount of the wind turbine generator G1 using the power generation characteristic data 422.

  S4 is a step in which the target voltage calculation unit 413 calculates a target voltage for the line voltage adjusting transformer 200 and the like. In this step, the target voltage calculation unit 413 calculates the target voltage of the line voltage adjusting transformer 200 and the like based on the predicted value of the power generation amount of the wind turbine generator G1 calculated in the step S3 and the voltage fluctuation characteristic data 423. calculate. That is, the target voltage calculation unit 413 converts the prediction value of the power generation amount of the wind turbine generator G1 at the prediction target date and time into the shift control amount of the line voltage adjustment transformer 200 using the voltage fluctuation characteristic data 423, and performs prediction. A value obtained by subtracting the shift control amount from the target voltage is calculated as a normal target voltage. Note that the target voltage calculation unit 413 calculates the target voltage based on the point G because the downstream side G point of the wind power generator G1 has the largest voltage fluctuation and is likely to deviate from the appropriate range.

At this time, the target voltage calculation unit 413 sets the target voltage so that the voltage at the point G becomes higher within the appropriate range when the predicted value of the wind speed is large, in preparation for a sudden change in the wind speed. When the predicted wind speed is small, it is desirable to set the target voltage so that the voltage at point G is lower within the appropriate range. FIG. 9 shows the target voltage (voltage on the low-voltage distribution line side at point G) and the actual value (voltage on the low-voltage distribution line side at point G) when the wind speed suddenly changes from strong wind to weak wind. In FIG. 9, the vertical axis (V _G ) represents the voltage at point G (value converted to the voltage of the low-voltage distribution line), and the horizontal axis (t) represents the time axis. FIG. 9 shows a case where the target voltage is set so that the voltage at the point G becomes higher within the appropriate range when the predicted value of the wind speed is large, thereby temporarily changing suddenly to a weak wind (FIG. 9). 9 also indicates that the voltage at point G does not deviate from the appropriate range (the voltage of the low-voltage distribution line is 101 ± 6 V). In this case, the predicted value of the wind speed is large or small, for example, the wind speed (for example, 10 m / s) before the rated output operation of the wind power generator G1 with a large fluctuation in the power generation amount of the wind power generator G1. Use the reference value.

  At this time, the target voltage calculation unit 413 determines that the target voltage to be changed in the upstream system voltage adjustment transformer 100 when the variation in the power generation amount of the wind turbine generator G1 calculated in the step S3 is a certain level or more. Is also calculated. That is, when the power generation amount of the wind power generator G1 changes rapidly, there is a possibility of causing a voltage drop or a voltage rise in the entire upstream power system. Therefore, the voltage regulator 400 controls the target voltage of the upstream system voltage regulator 100 in addition to the line voltage regulator 200 based on the predicted wind speed. In this case, similarly to the above, the voltage adjustment device 400 is based on the data indicating the relationship between the power generation amount of the wind power generation device G1 in the voltage fluctuation characteristic data M3 and the shift control amount of the system voltage adjustment transformer 100. The target voltage of the system voltage adjusting transformer 100 is controlled.

  At this time, the target voltage calculation unit 413 also calculates a plan for introducing the phase adjusting equipment such as the power capacitor 300. The power capacitor 300 can only roughly adjust the voltage as compared with the line voltage adjusting transformer 200. However, by introducing this, the downstream voltage drop such as the point G can be prevented. Therefore, for example, when the predicted wind speed value continues to be close to 0, the power capacitor 300 is turned on to keep the voltage high by a certain amount, and the upstream system voltage regulating transformer 100 In addition, the range of voltage adjustment of the line voltage adjusting transformer 200 can be reduced. The charging plan means a charging state of the power capacitor 300 for each prediction target date and time.

  S5 is a step in which the instruction unit 415 outputs an adjustment instruction to the line voltage adjustment transformer 200 or the like so that the target voltage is reached. In this step, the instruction unit 415 outputs a target voltage adjustment instruction to the voltage relay 210 and the voltage relay 110 when the prediction date / time is reached. The voltage relay 210 and the voltage relay 110 control the target voltage in response to receiving the instruction signal from the instruction unit 415. That is, the voltage relay 210 and the voltage relay 110 respectively control the reference voltages (target voltage +0.5 V (upper limit value), target voltage -0.5 V (lower limit value)) that serve as a reference for the tap switching instruction. Thereby, the output voltage of the line voltage adjusting transformer 200 and the system voltage adjusting transformer 100 is controlled so as to approach the target voltage.

  Similarly, in this process, the instruction unit 415 changes the power capacitor 300 input state so that the power capacitor 300 input state is changed in accordance with the power capacitor 300 input plan when the prediction target date / time is reached. An adjustment instruction is output to the capacitor 300 for use. And according to receiving the instruction | indication signal from the instruction | indication part 415, the electric power capacitor | condenser 300 controls the switch between high voltage distribution lines L1 so that it may be in the said input state.

  As described above, through the steps S1 to S5, the voltage adjustment device 400 performs voltage adjustment so that the voltage of the high-voltage distribution line L1 is in an appropriate range (the voltage of the low-voltage distribution line is 101 ± 6 V) on the prediction target date and time. be able to.

  In the above description, the calculation of the target voltage of the line voltage adjustment transformer 200 or the like at the date and time of the prediction target of the temporary point has been described. However, the voltage adjustment device 400 is, for example, an hourly line voltage adjustment transformer. 200, the target voltage of the system voltage adjusting transformer 100 and the input plan of the power capacitor 300 are created on the day before the prediction target date and time in units of one day.

  As mentioned above, according to the voltage regulator 400 which concerns on this embodiment, the target voltage of the transformer 200 for line voltage regulation is set beforehand based on the fluctuation | variation of the electric power generation amount of the wind power generator G1 resulting from the change of a wind speed. I can leave. As a result, the output voltage of the line voltage adjusting transformer 200 is controlled before the wind speed changes, and the voltage of the high-voltage distribution line L1 is within an appropriate range (low-voltage distribution line even if the power generation amount of the wind power generator varies). Is maintained to be 101 ± 6 V).

  In particular, when the predicted value of wind speed is large, the target voltage is set so that the voltage at point G is higher within the proper range, and when the predicted value of wind speed is small, the voltage at point G is within the proper range. When the target voltage is set so as to be low, it is possible to cope with a temporary sudden change in the wind speed.

  In addition to the line voltage adjusting transformer 200, the voltage adjusting device 400 according to the present embodiment can also set a target voltage for the upstream system voltage adjusting transformer 100 and the like. As a result, it is possible to cope in advance with the influence on the upstream side caused by fluctuations in the amount of power generated by the wind turbine generator G1.

Second Embodiment
In order to improve the prediction accuracy of the predicted value of the power generation amount of the wind power generator G1, the voltage regulator 400 ′ according to the present embodiment generates power generation characteristics of the wind power generator G1 based on the past power generation result data of a plurality of dates and times. Correct. Then, the voltage adjustment device 400 ′ controls the target voltage of the line voltage adjustment transformer 200 based on the corrected power generation characteristic, thereby setting the target voltage setting error based on the error in the power generation characteristic of the wind power generator G1. And the high voltage distribution line L1 is prevented from deviating from an appropriate voltage. In addition, description is abbreviate | omitted about the structure which is common in 1st Embodiment.

  The power generation characteristics of a wind turbine generator are generally determined based on wind energy per unit area shown in the following formula (3). That is, the power generation characteristic data 422 is reference data on the assumption that the power generation amount (kW) of the wind turbine generator is determined only by the wind speed.

（但し、Ｑは風力エネルギー、ρは１気圧／温度１５℃における空気密度、ｖは風速を表す。）
しかし、実際には、風力発電装置の発電量は、温度、湿度、気圧等に起因して、空気密度やプロペラの回転特性が影響を受け、当該発電特性からずれる場合がある。そのため、本実施形態に係る電圧調整装置４００’は、発電量の予測精度を向上させるべく、過去の複数の日時の、風力発電装置の発電量の実績値と、対応する日時の温度、湿度、気圧等の実際値を用いて、風速を含む温度、湿度、気圧等の気象情報と、風力発電装置の発電量の関係式（以下、「補正発電特性」とも言う）を算出し、発電量予測部４１２’は、これを用いて、風力発電装置Ｇ１の発電量の予測値を算出する。即ち、補正発電特性は、発電特性データ４２２を、気圧、湿度、温度等による風力発電装置Ｇ１の発電量への影響を反映させるように補正した発電特性であり、発電量予測部４１２’が、より精度の高い発電量の予測値を算出することを可能とする、風力発電装置の発電量と、風速を含む複数種類の気象情報の予測値の関係式である。

(However, Q represents wind energy, ρ represents air density at 1 atm / temperature of 15 ° C., and v represents wind speed.)
However, in practice, the amount of power generated by the wind turbine generator may deviate from the power generation characteristics due to the influence of the air density and the propeller rotation characteristics due to temperature, humidity, atmospheric pressure, and the like. Therefore, in order to improve the prediction accuracy of the power generation amount, the voltage adjustment device 400 ′ according to the present embodiment has the actual value of the power generation amount of the wind power generation device and the corresponding temperature, humidity, Using actual values such as atmospheric pressure, calculate the relationship between meteorological information including temperature, humidity, and atmospheric pressure, including wind speed, and the amount of power generated by the wind power generator (hereinafter also referred to as “corrected power generation characteristics”) to predict the amount of power generated The unit 412 ′ uses this to calculate a predicted value of the power generation amount of the wind turbine generator G1. That is, the corrected power generation characteristic is a power generation characteristic obtained by correcting the power generation characteristic data 422 so as to reflect the influence on the power generation amount of the wind power generator G1 due to atmospheric pressure, humidity, temperature, etc., and the power generation amount prediction unit 412 ′ It is a relational expression between the power generation amount of the wind power generator and the prediction values of a plurality of types of weather information including wind speed, which makes it possible to calculate a predicted value of the power generation amount with higher accuracy.

  FIG. 10 shows a configuration of a voltage regulator 400 'according to the present embodiment. In the voltage adjustment device 400 ′ according to the present embodiment, the storage unit 420 has power generation result data 426 ′, the control unit 410 has a correction unit 415 ′, and the power generation amount prediction unit 412 ′ has a correction unit 415. It differs from the voltage regulator 400 which concerns on 1st Embodiment by the point which calculates the predicted value of the electric power generation amount of the wind power generator G1 using the correction | amendment power generation characteristic calculated by '.

  The power generation result data 426 ′ is data related to the actual value of the power generation amount that is acquired and stored by the voltage regulator 400 ′ from the wind power generator G <b> 1 via the communication line 600. FIG. 11 shows a data table of the power generation result data 426 '. In the power generation result data 426 ′, the actual value of the power generation amount in each time zone is stored in association with the date / time information. The actual value of the power generation amount is, for example, an average output power (kW) for one hour stored in the wind power generator G1. And the voltage regulator 400 'acquires the said data by performing data communication with the wind power generator G1.

  In addition, the voltage regulator 400 ′ according to the present embodiment, when calculating the relational expression (corrected power generation characteristics) of weather information such as temperature, humidity, and pressure including wind speed and the power generation amount of the wind power generator, Weather forecast data 421 ′ is used. FIG. 12 shows a data table of weather forecast data 421. The weather forecast data 421 ′ for the past is similar to the future weather forecast data 421 shown in FIG. 4 for every hour related to wind speed, wind direction, air pressure, temperature, and humidity at the position where the wind power generator G1 is installed. Are stored in a table format in association with date / time information. The weather forecast data 421 ′ is a predicted value and is not a value that completely matches the actual value, but is updated by the acquisition unit 411 ′ until immediately before the prediction target date and time (for example, one hour before), and the actual value (Hereinafter referred to as “value according to actual value”). For this reason, the correction unit 415 ′ according to the present embodiment can perform statistical analysis even using the prediction data regarding the past date and time in the weather prediction data 421 ′. However, when calculating the corrected power generation characteristic with higher accuracy, it is more effective to use the actually measured weather data for the date and time corresponding to the weather forecast data 421 '.

  Specifically, the correction unit 415 ′ generates power generation result data 426 ′, weather forecast data 421 ′ (value corresponding to an actual value), and power generation characteristic data 422 at a plurality of past dates and times (for example, for the past one year). Based on the actual value of the power generation amount of the wind power generator G1, the expected value of the power generation amount converted from the value according to the actual value of the wind speed, and the actual value of multiple types of weather data The corrected power generation characteristic indicating the relationship between each value is calculated. Note that the correction unit 415 ′ includes a wind speed, a wind direction, an atmospheric pressure, a temperature, and a predicted value (a value corresponding to an actual value) of a plurality of types of weather information including the wind speed in the past predetermined period in the weather prediction data 421 ′. Use humidity.

  Then, the correction unit 415 ′ calculates the corrected power generation characteristic, for example, by performing regression analysis on the following formula (4).

（但し、Ｐは目的変数（発電量の実績値）、Ｘ₁〜Ｘ₆は説明変数（Ｘ₁は風速値から発電特性を用いて求めた発電量の見込み値、Ｘ₂は温度、Ｘ₃は湿度、Ｘ₄は風速、Ｘ₅は気圧、Ｘ₆は風向）、ａは切片、ｂ〜ｇはそれぞれ回帰係数を表す）
この場合、補正部４１５’は、日時情報の対応付けに基づいて、過去１年分の気象予測データ４２１’の夫々の予測値（実際値に応じた値）をＸ₂〜Ｘ₆に入力し、気象予測データ４２１’の風速の実際値に応じた値から発電特性により換算される発電量の見込み値をＸ₁に入力し、発電実績データ４２６’の発電実績をＰに入力する。そして、補正部４１５’は、回帰分析の手法として、例えば、最小二乗法を用いて、式（４）の係数ａ〜ｇを定めることにより、補正発電特性を算出することができる。

(Where P is an objective variable (actual value of power generation amount), X _{1 to} X ₆ are explanatory variables (X ₁ is an estimated value of power generation amount obtained from the wind speed value using power generation characteristics, X ₂ is temperature, X ₃ Is humidity, X ₄ is wind speed, X ₅ is atmospheric pressure, X ₆ is wind direction), a is intercept, and b to g are regression coefficients)
In this case, the correction unit 415 ', based on the association of the date and time information, historical weather forecast data 421 for one year' enter the predicted value of each of the (value corresponding to the actual value) to X ₂ to X ₆ , 'enter the estimated value of the power generation amount is converted by the power generation characteristics from a value corresponding to the actual value of the wind speed of the X _1, power generation performance data 426' weather forecast data 421 to enter the power generation performance of the P. And correction | amendment part 415 'can calculate a correction | amendment electric power generation characteristic by determining the coefficient ag of Formula (4), for example using the least squares method as a method of regression analysis.

  The correction unit 415 'preferably calculates the corrected power generation characteristic for each season. Since temperature, humidity, atmospheric pressure, and wind speed show the same tendency according to the season, the calculation accuracy of the power generation amount can be further improved by calculating the corrected power generation characteristics for each season.

Then, the power generation amount prediction unit 412 ′ inputs predicted values of a plurality of types of weather information of the weather prediction data 421 ′ of the prediction date and time into X _{2 to} X ₆ of the corrected power generation characteristics (formula (4)). Then, by inputting the expected value of the power generation amount converted by the power generation characteristic data 422 ′ from the predicted value of the wind speed at the prediction target date and time into X ₁ of the corrected power generation characteristic (formula (4)), the wind power generator G1 A predicted value of the power generation amount can be calculated.

  Further, the target voltage calculation unit 413 ′ is based on the predicted value of the power generation amount of the wind power generator G1 calculated by the power generation amount prediction unit 412 ′ and the voltage fluctuation characteristic data 423 ′ (same configuration as in the first embodiment). The target voltage of the line voltage adjusting transformer 200 and the system voltage adjusting transformer 100 is calculated, and the charging plan of the power capacitor 300 is calculated.

  In the present embodiment, the above-described steps enable the calculation of the predicted value of the power generation amount of the wind turbine generator G1 with higher accuracy than in the first embodiment and the setting of the target voltage with higher accuracy than in the first embodiment. . That is, according to the voltage regulator 400 ′ according to the present embodiment, setting errors of the target voltage based on the error in the power generation characteristics of the wind power generator G1 are prevented, and the voltage of the high-voltage distribution line L1 is surely set within an appropriate range ( The voltage of the low voltage distribution line is maintained to be 101 ± 6V.

<Other embodiments>
In the above embodiment, after calculating the target voltage for the prediction target date and time, when the prediction target date and time approaches (for example, 10 minutes before the prediction target date and time), prediction of the power generation amount of the wind turbine generator The value and the target voltage may be updated. The predicted value of the amount of power generated by the wind turbine generator needs to be calculated as early as possible in order to formulate a power generation plan (for example, one day before the date and time of the prediction target). As the date and time approaches, it becomes possible to calculate or acquire an accurate predicted value. In this regard, according to the voltage regulator 400 according to the above embodiment, the voltage fluctuation of the high-voltage distribution line L1 is calculated based on the power generation characteristic data 422 and the voltage fluctuation characteristic data 423. Can be immediately reflected in the target voltage. Therefore, for example, the power generation amount prediction unit 412 determines that the wind power generator G1 is based on the updated predicted wind speed when the date and time of the prediction target approaches (for example, 10 minutes before the date and time of the prediction target). The target voltage calculation unit 413 updates the target voltage based on the updated predicted value of the power generation amount of the wind turbine generator G1.

  In the above embodiment, the voltage regulator 400 and the voltage relay 210 (or the voltage relay 110) are shown as separate devices. However, the voltage regulator 400 and the voltage relay 210 (or the voltage relay 110) are integrated. In this case, the voltage relay 210 may be provided with the function of the control unit 410 of the voltage regulator 400 described above.

  Moreover, in the said embodiment, when the wind power generator G1 is connected to the high voltage distribution line L1, the voltage adjustment apparatus 300 controls the target voltage of the line voltage adjustment transformer 200, so that the high voltage distribution line L1. The aspect which performs voltage adjustment was demonstrated. However, when the wind power generator G1 is connected to the bus LL of the system voltage adjusting transformer 100, the voltage adjusting device 300 controls the target voltage of the system voltage adjusting transformer 100, thereby controlling the bus LL. The same can be applied to the mode of voltage adjustment.

  Each of the above embodiments discloses an invention specified by the following description.

  The main present invention that solves the above-described problem is to control the target voltage of the voltage output from the voltage regulating transformers 100, 200 to the secondary side, thereby controlling the voltage of the distribution line connected to the wind power generator G1. A voltage regulator 400 to be adjusted, which is a power generation characteristic (power generation) indicating a predicted value of wind speed (corresponding to weather forecast data 421) at the installation position of the wind power generator G1, and a relationship between the wind speed and the power generation amount of the wind power generator G1. Power generation amount prediction unit 412 that calculates a predicted value of the power generation amount of the wind turbine generator G1 based on the characteristic data 422), a predicted value of the power generation amount of the wind power generator G1, and the power generation amount and voltage adjustment Based on the voltage fluctuation characteristic (corresponding to the voltage fluctuation characteristic data 423) indicating the relationship between the shift control amounts of the transformers 100 and 200, the target voltage calculation unit 413 that calculates the target voltage, and the voltage output to the secondary side The instruction unit 414 for controlling the voltage adjusting transformers 100, 200 to approach the target voltage, a voltage regulator 400, characterized in that it comprises a. Thereby, the target voltage of the voltage adjusting transformers 100 and 200 can be set in advance based on the fluctuation of the power generation amount of the wind turbine generator G1 due to the change in the wind speed. Therefore, even if the output voltage of the voltage adjusting transformers 100 and 200 is controlled before the wind speed changes, and the power generation amount of the wind power generator G1 fluctuates, the voltage of the high voltage distribution line L1 is within an appropriate range (low voltage distribution). It is maintained so that the voltage of the electric wire is 101 ± 6 V).

  Here, the actual value of the power generation amount of the wind power generator G1 at a plurality of past dates and times (corresponding to the power generation result data 426 ′) and the actual values of a plurality of types of weather information including the wind speed at the installation position of the wind power generator G1. Based on the value corresponding to the past (corresponding to the past of the weather forecast data 421 ′) and the expected value of the power generation amount of the wind power generator G1 converted from the value corresponding to the actual value of the wind speed by the power generation characteristics, A correction unit 415 ′ that calculates a corrected power generation characteristic (corresponding to the above equation (4)) indicating the relationship between the values, and the power generation amount prediction unit 41′2 includes a plurality of types of weather information including wind speed. Even if the predicted value of the power generation amount of the wind power generator G1 is calculated using the corrected power generation characteristics based on the predicted value and the predicted value of the power generation amount converted from the predicted value of the wind speed by the power generation characteristics. Good. This prevents an error in setting the target voltage based on the power generation characteristic error of the wind power generator G1, and ensures that the voltage of the high voltage distribution line L1 is within an appropriate range (the voltage of the low voltage distribution line is 101 ± 6V). Will be maintained.

  Here, the plurality of types of weather information including the wind speed may include at least the wind speed, the wind direction, the atmospheric pressure, the temperature, and the humidity.

  Here, when the predicted value of the wind speed is large, the target voltage calculation unit 413 calculates the target voltage so that the voltage of the distribution line connected to the wind power generator G1 is lower within the appropriate range, When the predicted value of the wind speed is small, the target voltage may be calculated so that the voltage of the distribution line interconnected with the wind power generator G1 is higher within an appropriate range. As a result, it is possible to cope with a temporary sudden change in wind speed.

  Here, when the date and time for which the target voltage is to be predicted is approaching, the power generation amount prediction unit 412 determines the power generation amount of the wind power generator G1 based on the updated predicted wind speed at the installation position of the wind power generator G1. The predicted value may be updated, and the target voltage calculation unit 413 may update the target voltage based on the updated predicted value of the power generation amount of the wind turbine generator G1. This makes it possible to set a target voltage that reflects a more accurate predicted wind speed.

  Here, in the case where the second voltage adjustment transformer 100 that supplies power to the voltage adjustment transformer 200 is installed on the upstream side of the voltage adjustment transformer 200, the target voltage calculation is performed by calculating the power generation amount and the second value. The target voltage of the second voltage adjustment transformer 100 may be calculated based on the second voltage fluctuation characteristic indicating the relationship of the shift control amount of the voltage adjustment transformer 100. As a result, it is possible to cope in advance with the influence on the upstream side caused by fluctuations in the amount of power generated by the wind turbine generator G1.

  Here, when the phase adjusting equipment 300 is connected to a distribution line interconnected with the wind power generator G1, the target voltage calculation unit 413 adjusts the predicted power generation amount of the wind power generator G1, the power generation amount, and the voltage adjustment. Based on the voltage fluctuation characteristics indicating the relationship between the shift control amounts of the transformers 100 and 200, the target voltage of the voltage adjusting transformers 100 and 200 is calculated, the input plan of the phase adjusting equipment 300 is calculated, and the instruction unit May control the voltage adjusting transformers 100 and 200 so that the voltage output to the secondary side approaches the target voltage, and may control the phase adjusting equipment 300 according to the charging plan. As a result, it is possible to cope in advance with fluctuations in the power generation amount of the wind turbine generator G1.

  Here, the instruction unit 414 monitors the voltage output from the voltage adjusting transformers 100 and 200 to the secondary side, and controls the target voltage of the voltage relay that outputs the tap switching signal, thereby adjusting the voltage. The voltage which the transformers 100 and 200 output to the secondary side may be controlled.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

DESCRIPTION OF SYMBOLS 100 System voltage adjustment transformer 110 Voltage relay 200 Line voltage adjustment transformer 210 Voltage relay 300 Power capacitor 400 Voltage adjustment apparatus 500 Weather information provision apparatus 600 Communication line G1 Wind power generator Tr1-Tr4 Pillar transformer R1-R4 Customer LL High voltage bus L1 High voltage distribution line

The main present invention that solves the above-mentioned problems is a voltage adjustment that adjusts the voltage of the distribution line that is connected to the wind power generator by controlling the target voltage of the voltage that the voltage adjustment transformer outputs to the secondary side. An amount of power generated by the wind turbine generator based on a predicted value of the wind speed at the installation position of the wind turbine generator and a power generation characteristic indicating a relationship between the wind speed and the amount of power generated by the wind turbine generator. The target voltage based on a power generation amount prediction unit that calculates a predicted value, a predicted value of the power generation amount of the wind turbine generator, and a voltage fluctuation characteristic indicating a relationship between the power generation amount and the shift control amount of the voltage adjusting transformer. A target voltage calculation unit for calculating the voltage, an instruction unit for controlling the voltage adjustment transformer so that a voltage to be output to the secondary side approaches the target voltage, and a plurality of past dates and times of the wind turbine generator Actual value of power generation and previous A value according to the actual value of a plurality of types of weather information including the wind speed at the installation position of the wind power generator, and a predicted value of the power generation amount of the wind power generator converted from the value according to the actual value of the wind speed by the power generation characteristics A correction unit that calculates a corrected power generation characteristic indicating a relationship between these values based on weather prediction data relating to past date and time, and the power generation amount prediction unit includes a plurality of types of weather information including wind speed A predicted value of the power generation amount of the wind power generator is calculated using the corrected power generation characteristics based on the predicted value of the wind speed and the estimated value of the power generation amount converted from the predicted value of the wind speed by the power generation characteristics. The voltage regulator characterized by the above. Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

Claims (8)

A voltage regulator that regulates the voltage of the distribution line that is connected to the wind power generator by controlling the target voltage of the voltage that the voltage regulator transformer outputs to the secondary side,
A predicted value of the power generation amount of the wind power generator is calculated based on the predicted value of the wind speed at the installation position of the wind power generator and the power generation characteristics indicating the relationship between the wind speed and the power generation amount of the wind power generator. A power generation amount prediction unit;
A target voltage calculation unit that calculates the target voltage based on a predicted value of the power generation amount of the wind turbine generator, and a voltage fluctuation characteristic indicating a relationship between the power generation amount and a shift control amount of the voltage adjustment transformer;
An instruction unit for controlling the voltage adjusting transformer so that a voltage to be output to the secondary side approaches the target voltage;
A voltage adjusting device comprising: According to the actual value of the power generation amount of the wind power generation device at a plurality of past dates and times, the value according to the actual value of multiple types of weather information including the wind speed at the installation position of the wind power generation device, and the actual value of the wind speed A correction unit that calculates a corrected power generation characteristic indicating a relationship between these values, based on the estimated value of the power generation amount of the wind turbine generator converted from the power generation characteristic from the calculated value,
The power generation amount prediction unit uses the corrected power generation characteristics based on predicted values of a plurality of types of weather information including wind speeds and expected values of power generation amounts converted from the predicted values of wind speeds by the power generation characteristics. The predicted value of the electric power generation amount of the wind power generator is calculated. The voltage regulator according to claim 1 or 2. The voltage regulator according to claim 2, wherein the plurality of types of weather information including the wind speed includes at least wind speed, wind direction, atmospheric pressure, temperature, and humidity. The target voltage calculation unit, when the predicted value of the wind speed is large, calculates the target voltage so that the voltage of the distribution line interconnected with the wind power generator is lower within an appropriate range, The target voltage is calculated such that when the predicted value of the wind speed is small, the voltage of the distribution line interconnected with the wind power generator is increased within an appropriate range. The voltage regulator as described in any one of Claims. When the target date and time of the target voltage are near,
The power generation amount prediction unit updates the predicted value of the power generation amount of the wind power generator based on the updated predicted value of the wind speed at the installation position of the wind power generator,
The voltage regulation device according to any one of claims 1 to 4, wherein the target voltage calculation unit updates the target voltage based on the updated predicted value of the power generation amount of the wind turbine generator. . When a second voltage adjusting transformer for supplying power to the voltage adjusting transformer is installed on the upstream side of the voltage adjusting transformer,
The target voltage calculation is based on a second voltage fluctuation characteristic indicating a relationship between the power generation amount and a shift control amount of the second voltage adjustment transformer, and a target voltage of the second voltage adjustment transformer. The voltage regulator according to any one of claims 1 to 5, wherein the voltage regulator is calculated. When phase adjusting equipment is connected to a distribution line interconnected with the wind power generator,
The target voltage calculation unit is configured to calculate the voltage adjustment transformer based on a predicted value of the power generation amount of the wind turbine generator and a voltage fluctuation characteristic indicating a relationship between the power generation amount and a shift control amount of the voltage adjustment transformer. While calculating the target voltage, calculating the input plan of the phase adjusting equipment,
The instruction unit controls the voltage adjustment transformer so that a voltage output to a secondary side approaches the target voltage, and controls the phase adjusting equipment according to the input plan. The voltage regulator according to any one of 1 to 6. The instruction unit monitors the voltage output from the voltage adjusting transformer to the secondary side, and controls the target voltage of the voltage relay that outputs the tap switching signal, so that the voltage adjusting transformer is The voltage output to the side is controlled. The voltage regulator as described in any one of Claims 1 thru | or 7 characterized by the above-mentioned.

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