JP2018019517A - Series voltage regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain, in a proper range, an installation point voltage of a peripheral apparatus with output surplus power of the peripheral apparatus ensured.SOLUTION: The series type voltage regulating device is, for example, an SSSC (14) connected in series to a distribution system, and changes an output command value to approximate an output of a peripheral apparatus to 0 or a predetermined value from output information of reactive power or a virtual output of an own end and the peripheral apparatus.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a series voltage regulator that is connected in series to a power distribution system and controls a secondary side voltage.

The voltage of the distribution system is changed by tap position switching by load ratio control transformer (LRT) installed in distribution substation, automatic voltage regulator (SVR: Step installed in distribution line (feeder)) Tap position switching with voltage regulator (Static Synchronous Series) (SSSC: Static Synchronous Series)
Compensator) etc. LRT and SVR are step type series voltage regulators, and SSSC is a continuous series voltage regulator. Hereinafter, these are collectively referred to as a series voltage regulator.

  By the way, in the recent distribution system, the consumers equipped with the photovoltaic power generation device (PV: Photovoltaics) are increasing. The power generation output of the photovoltaic power generation device is affected by weather fluctuations, causing a rapid voltage fluctuation in the distribution system. On the other hand, a static reactive power compensator (SVC: Static Var Compensator) and a reactive power compensator (STATCOM: Static Synchronous Compensator), which have a function to quickly suppress voltage fluctuations by high-speed reactive power output control, are used in the distribution system. It is expected to connect and suppress sudden voltage fluctuations. Hereinafter, these are collectively referred to as a parallel voltage regulator. Devices installed in the control target section of the series voltage regulator can be handled as adjacent devices on the distribution line in relation to the series voltage regulator. In addition to the parallel voltage regulator, sensor devices connected to the distribution line are included in the adjacent devices.

  A series voltage regulator is installed on the substation side (sending side), and a parallel voltage regulator is installed on the terminal side of the distribution line. Since the parallel voltage regulator operates at a higher speed than the series voltage regulator, the parallel voltage regulator operates before the series voltage regulator with respect to voltage fluctuation. Since the parallel voltage regulator performs voltage control prior to the series voltage regulator, there is a concern that a phenomenon that the series voltage regulator does not operate may occur. If the parallel voltage regulator operates so that the installation point voltage converges within the appropriate range, the parallel voltage regulator may continue to operate at the maximum output, and there is an output margin to suppress steep voltage fluctuations. Disappear. As a result, there is a possibility that the original function of the parallel voltage regulator, that is, suppression of steep voltage fluctuations, cannot be performed.

  In view of this, a power control system has been proposed in which a series voltage regulator and a parallel voltage regulator are operated appropriately in cooperation (for example, see Patent Document 1). In the power control system described in Patent Document 1, the SVR grasps the current output value or output history information of the SVC, and estimates a target voltage assuming a case where the SVC has no output based on the information. For the estimation of the target voltage, the voltage correction amount ΔVs is calculated using, for example, the output current of the SVC and a parameter corresponding to the short-circuit reactance on the distribution substation side. The voltage correction amount ΔVs indicates a voltage difference generated between when the SVC has no output and when the SVC has an output. The voltage correction amount ΔVs is subtracted from the tap operation determination reference value Vs including the voltage variation due to the output of the SVC to exclude the influence due to the voltage variation due to the output of the SVC, and this correction voltage is at the target voltage point of the SVR. It is disclosed that the automatic voltage regulator SVR is operated so as to reduce the output of the reactive power compensator SVC when it deviates from an appropriate voltage.

JP 2014-33492 A

  However, the power control system of Patent Document 1 is a parallel voltage regulator as long as the correction voltage obtained by subtracting the voltage correction amount ΔVs does not deviate from the appropriate range at the target voltage point of the SVR that is the series voltage regulator. There is a situation in which the SVC command value is not changed and there is no opportunity to reduce the output of the SVC. As a result, there is a problem that the SVC which is an adjacent device falls into a state where there is no output margin.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a series voltage regulator capable of maintaining the installation point voltage of an adjacent device within an appropriate range while bringing the output of the adjacent device close to zero. To do.

  A series voltage regulator according to one aspect of the present invention is a series voltage regulator connected in series to a power distribution system, and the output of the adjacent device is set to 0 or a predetermined value based on output information of the local terminal and the adjacent device. The output command value is changed so as to be close to.

  ADVANTAGE OF THE INVENTION According to this invention, the series type voltage regulator which can maintain the installation point voltage of the said adjacent apparatus in an appropriate range, bringing the output of an adjacent apparatus close to 0 can be provided.

It is a figure which shows an example of the whole structure of a power distribution system. It is a figure which shows the mode of the input information from SVC used as an adjacent apparatus to SSSC. It is a figure which shows the structural example of SSSC. It is a figure which shows the control content of SSSC in 1st Embodiment. It is a figure which shows the control content in SSSC by a transfer function, when an adjacent apparatus is SVC. It is a figure explaining the cooperative control operation | movement in SSSC. It is a figure explaining the protection operation | movement by SSSC in 1st Embodiment. It is a flowchart in SSSC in 1st Embodiment. It is a figure which shows the control content in SSSC with a transfer function, when an adjacent apparatus is a sensor apparatus. It is a figure explaining an example of the calculation method of the virtual output of a sensor apparatus in 1st Embodiment. It is a figure which shows the limiter mechanism in the series type voltage regulator of 2nd Embodiment.

(First embodiment)
The series voltage regulator according to the present embodiment will be described below with reference to the accompanying drawings. FIG. 1 is a diagram illustrating a configuration example of a power distribution system in which the series voltage regulator according to the present embodiment is installed. In the distribution system shown in FIG. 1, a constant voltage power supply 11 is installed at a substation, and an LRT 12 is installed at a bank of the substation. A plurality of distribution lines 13 are connected in parallel to the bus connected to the secondary side of the LRT 12 (only one system is shown in FIG. 1). The distribution line 13 is connected to an SSSC 14 that is a series voltage regulator connected in series to the distribution line 13, and the SVC 15 that is an adjacent device connected in parallel to the distribution line 13 on the lower side of the SSSC 14. Is connected. In addition, a sensor device 16 serving as another adjacent device is installed on the distribution line 13 on the lower side of the SSSC 14. The SVC 15 is an adjacent device installed in the control target section of the SSSC 14 and is a parallel voltage regulator connected in parallel to the distribution line 13. The sensor device 16 is an adjacent device installed in the control target section of the SSSC 14 and is a sensor that detects sensor installation point information (for example, at least one of voltage, current, and phase). The sensor device 16 may be a single sensor, or may be configured by a switch with a built-in sensor function, an SSSC with a built-in sensor function, a voltage tide meter with a built-in sensor function, or the like. In addition, the consumer 17 and the solar power generation device 18 are connected to the distribution line 13 in the control object area of SSSC14. In this example, the description will be given focusing on a section from SSSC 14 serving as a series voltage regulator to SVC 15 serving as an adjacent device or a section from SSSC 14 to sensor device 16 serving as an adjacent device.

  As shown in FIG. 2, the SSSC 14 serving as a series voltage regulator and the SVC 15 serving as an adjacent device are communicably connected via a communication network 21, and the output information (reactive power, current, etc.) of the SVC 15 is SSSC 14. To be notified. Although not shown, the sensor device 16 that is another adjacent device is connected to the SSSC 14 that is a series-type voltage regulator via the communication network 21 so as to be communicable with the output information of the sensor device 16. Is notified to the SSSC 14. The output information of the sensor device 16 is, for example, a voltage at an installation point of the sensor device 16 (hereinafter referred to as a sensor point voltage). The SSSC 14 performs LDC (Line Drop Compensator) control for controlling the target voltage (for example, the intermediate point P1 between the SSSC 14 and the SVC 15) illustrated in FIG. 2 by changing the voltage command value. Since the LDC control is an existing technology, details are omitted.

  FIG. 3 shows a configuration example of the SSSC 14. The SSSC 14 includes a series transformer 14 a and a self-excited converter 14 b, and the series transformer 14 a is connected to the distribution line 13 in series. The SSSC 14 changes the voltage of the control target section by adjusting the voltage with the self-excited converter 14b. The SVC 15 is composed of, for example, a step-down transformer, a series reactor, a phase advance capacitor, and a high-voltage, large-capacity thyristor device. The high-speed control using the thyristor changes the reactive power continuously in a load state, and responds. Perform fast reactive power compensation.

  Next, the control contents in the SSSC 14 when the SSSC 14 of the series voltage regulator performs cooperative control of the SVC 15 that is an adjacent device will be specifically described.

  The SSSC 14 performs voltage control by determining an output command value so that the target voltage in the control target section is within an appropriate voltage (voltage management width) by local control. The target voltage of the SSSC 14 is a target value of the voltage at the intermediate point P1 (see FIG. 2) of the control target section of the SSSC 14. The SVC 15 controls the output so that the voltage at the SVC control point becomes a set value by local control. The SVC control point is a connection point P2 (see FIG. 2) between the SVC 15 and the distribution line 13.

  In this example, the SSSC 14 changes the output command value so that the output of the SVC 15 approaches 0 (or a predetermined value) from the output information of the terminal and the SVC 15. If the SSSC 14 determines the output command value so that the output of the SVC 15 approaches 0, the voltage at the SVC control point can be maintained at the set value by the output of the SSSC 14 without operating the SVC 15 as much as possible. As a result, the SVC 15 can be maintained in a state in which the output remaining capacity is ensured to the maximum.

  FIG. 4 is a diagram showing the control contents of the SSSC 14 which is a series voltage regulator. The SSSC 14 performs proportional control or proportional integral control on the deviation between the output (reactive power) captured this time from the SVC 15 of the adjacent device and the target value (target value = 0 in FIG. 4), and outputs an output command value (voltage command value). Has been decided. As shown in FIG. 4, when the target value is set to 0, the voltage command value of the SSSC 14 is controlled so that the output of the SVC 15 that is the adjacent device approaches 0. That is, the SSSC 14 operates so as to bear the load on the SVC 15 so that the SVC 15 is in a state of no output. As much as the SVC 15 approaches the state of no output, the output capacity of the SVC 15 can be secured. Note that the target value is not necessarily zero. For example, even if the output (reactive power) of the SVC 15 of the adjacent device is not 0, there may be no problem if the required output capacity can be reduced to a level that can be secured.

FIG. 5 shows an example in which the control content of the SSSC 14 is realized by a transfer function. The output target of the SVC 15 is set to zero. In the proportional element 31, the deviation between the current SVC output and the target value (= 0) is multiplied by the gain K to determine the voltage command value change amount, and the previous voltage command value is determined via the delay element (Z ⁻¹ ) 32. And the addition element 33 adds the previous voltage command value and the current voltage command value change amount to convert it to a new voltage command value. The new voltage command value is output through the protection limiter 34 as the final voltage command value.

Control for changing the gain K in proportion to the magnitude of the deviation may be applied. If the gain K multiplied by the deviation is increased, the amount of change in the voltage command value with respect to the output of the SSSC 14 increases, and the reaction speed of the SSSC 14 increases. Conversely, if the gain K applied to the deviation is reduced, the amount of change in the voltage command value with respect to the output of the SSSC 14 is reduced, and the reaction speed of the SSSC 14 is reduced. By controlling the gain K in accordance with the magnitude of the deviation in this way, the reaction speed of the SSSC 14 can be increased to approach the target value at a high speed when the deviation is large, while the target is reached when the deviation is small. Since it is close to the value, the reaction rate of SSSC 14 can be lowered and stabilized. Further, integration control is realized by delaying the previous voltage command value by the delay element (Z ⁻¹ ) 32 and adding it to the current voltage command value change amount. Although integral control is not essential, by incorporating integral control into the transfer function as shown in FIG. 5, even if the deviation is small, the deviation is repeatedly added and a voltage command value is output. No control is realized. The protection limiter 34 has an upper limit value and a lower limit value so that the target voltage and the secondary voltage of the SSSC 14 are within the appropriate range of the SSSC 14. For example, when the secondary voltage of the SSSC 14 deviates from the upper limit, the upper limit value of the protection limiter 34 is reduced and the new voltage command value is reduced.

  With reference to FIG.6 and FIG.7, the specific operation | movement by the series type voltage regulator (SSSC14) of this Embodiment is demonstrated. 6 and 7, the horizontal axis indicates each position on the distribution line 13 corresponding to SSSC 14 and SVC 15, and the vertical axis indicates the voltage at each position. FIG. 6 shows a voltage profile before the cooperative operation by the SSSC 14 by a solid line, and shows a voltage profile after the cooperative operation by a dotted line. Before the coordinated operation by the SSSC 14, the target voltage (P1) of the SSSC 14 is within the range of the appropriate voltage, and the voltage of the SVC 15 is increased until just before the voltage of the SVC control point (P2) is the upper limit of the appropriate range. The SVC 15 is in a state where the control point voltage is suppressed near the upper limit of the appropriate range by the output ΔQ determined by the local control. In the conventional local control, the SSSC 14 does not operate in the direction of decreasing the voltage of the control target section because the target voltage is within the range of the appropriate voltage. In the present embodiment, even if the target voltage is within the range of the appropriate voltage, the SSSC 14 obtains the current output of the SVC 15 (SVC output = ΔQ) and sets the SSSC 14 so that the SVC output (ΔQ) approaches 0. Make it work. As a result, the voltage in the control target section of the SSSC 14 is lowered as a whole, and the voltage at the SVC control point (P2) is lowered to the vicinity of the median value of the appropriate voltage as shown by the dotted line in FIG. In the control at its own end in the SVC 15, if the voltage at the SVC control point (P 2) reaches the median value of the appropriate voltage without depending on the SVC output, the SVC output ΔQ is set to 0 and there is no output. Therefore, by repeating the above cooperative operation, the target voltage (P1) of the SSSC 14 and the control point (P2) voltage of the SVC 15 can be maintained within an appropriate range without operating the SVC 15, and the output capacity can be reduced by setting the SVC 15 to the no output state. It can be in a secured state.

  FIG. 7 is a diagram showing a protection operation by the protection limiter 34 of the SSSC 14. In the coordinated operation (see FIG. 6) by the SSSC 14, the SSSC 14 operates so that the output of the SVC 15 approaches 0, but the operating range of the SSSC 14 at that time is limited so that the secondary voltage of the SSSC 14 does not exceed the appropriate voltage. The In the operation example shown in FIG. 7, the SSSC 14 is controlled so as to lower the overall voltage of the control target section in order to bring the output of the SVC 15 close to 0 by the cooperative operation by the SSSC 14, but before setting the SVC output ΔQ to 0, The secondary voltage of the SSSC 14 has reached the lower limit value of the appropriate voltage. For example, even if the voltage command value output from the addition element 33 shown in FIG. 5 is a numerical value that sets the SVC output ΔQ to 0, it is changed to a voltage command value corresponding to the lower limit value of the appropriate voltage by the protection limiter 34. Is output. Accordingly, the SSSC 14 operates so that the secondary voltage is lowered to the lower limit value of the appropriate voltage. As a result, in the SVC 15, the SVC output ΔQ is suppressed by the amount that the voltage at the SVC control point (P2) is lowered. .

  FIG. 8 is a flowchart of the cooperative operation in the SSSC 14. The SSSC 14 acquires the output information of the SVC 15 for each communication cycle (step S1). The SSSC 14 calculates how much the voltage command value should be changed from the obtained output information of the SVC 15 (step S2). The voltage command value change amount determined in step S2 is obtained by converting the deviation between the output of the SVC 15 and 0 (no SVC output) into a voltage amount by the gain K. Next, the voltage command value change amount calculated in step S2 is added to the current voltage command value to obtain a new voltage command value (step S3). If the SVC 15 performs a positive output, the voltage command value change amount is positive, and the voltage command value increases by adding this to the current voltage command value. As a result, the voltage at the SVC control point of the SVC 15 increases, and the SVC 15 can decrease the output. Therefore, if the output of the SVC 15 is a direction in which the output of the SVC 15 increases the voltage of the SVC 15, the SSSC 14 also increases the voltage command value, supports the voltage control of the SVC 15, and performs voltage control instead of the SVC 15. Reduce output. In addition, the SSSC 14 sets an upper limit value and a lower limit value in the protection limiter 34 to limit the operation range so that the secondary voltage and the target voltage of the SSSC 14 do not deviate from the appropriate range. It is determined whether the secondary voltage and the target voltage of the SSSC 14 assuming that the SSSC 14 operates with the new voltage command value calculated in step S3 do not depart from the appropriate range (step S4). If it is determined that the secondary voltage and the target voltage do not deviate from the appropriate range, the voltage command value is changed to the new voltage command value calculated in step S3 (step S5). On the other hand, if it is determined in step S4 that the secondary voltage and the target voltage deviate from the appropriate range, the process proceeds to step S1 without changing the voltage command value (step S6).

  Next, the control contents in the SSSC 14 when the SSSC 14 of the series voltage regulator performs coordinated control of the sensor device 16 of the adjacent device will be specifically described.

  As shown in FIG. 4, except for the output information of adjacent devices, the control content of the cooperative control by the SSSC 14 that is a series voltage regulator is substantially the same as that of the SVC 15. When the adjacent device is the sensor device 16, the voltage command value of the SSSC 14 is determined so that there is no deviation between the virtual output of the sensor device 16 and the target value (0). The SSSC 14 acquires a sensor point voltage from the sensor device 16 as output information. The deviation amount from the appropriate range of the acquired sensor point voltage can be calculated, and the integrated value of the deviation amount can be regarded as the virtual output of the sensor device 16. The SSSC 14 performs proportional control or proportional integral control on the deviation between the virtual output calculated from the sensor point voltage fetched from the sensor device 16 of the adjacent device and the target value (target value = 0 in FIG. 4), and outputs an output command value ( (Voltage command value) is determined. As shown in FIG. 4, when the target value is set to 0, the voltage command value of the SSSC 14 is controlled so that the virtual output of the sensor device 16 that is an adjacent device approaches 0. The virtual output of the sensor device 16 being 0 means that there is no deviation from the appropriate range of the sensor point voltage of the sensor device 16.

  FIG. 9 shows an example in which the control contents for the SSSC 14 to cooperatively control the sensor device 16 are realized by a transfer function. The output target of the virtual output of the sensor device 16 is set to zero. In the proportional element 31, the deviation between the current sensor device virtual output and the target value (= 0) is multiplied by the gain K to determine the voltage command value change amount, and the previous voltage via the delay element (Z-1) 32 is determined. The command value is taken in, and the addition element 33 adds the previous voltage command value and the current voltage command value change amount to convert it to a new voltage command value. The new voltage command value is output through the protection limiter 34 as the final voltage command value.

  With reference to FIG. 10, an example of the calculation method of the virtual output of the sensor device 16 will be described. The SSSC 14 that is a series voltage regulator calculates a negative virtual output when the sensor point voltage of the sensor device 16 that is an adjacent device deviates from the upper limit value of the appropriate range, and the SSSC 14 of the sensor device 16 that is an adjacent device. When the sensor point voltage deviates from the lower limit value of the appropriate range, a positive virtual output is calculated. The SSSC 14 is given an appropriate range (upper limit value and lower limit value) of the sensor point voltage of the sensor device 16 that is an adjacent device. First, the virtual output calculation based on the upper limit deviation will be described. The SSSC 14 acquires the sensor point voltage of the sensor device 16, and adds / subtracts the sensor point voltage acquired by the first adder / subtractor 41 as a negative value and the appropriate range upper limit value of the sensor point voltage as a positive value. The calculation result is accumulated for a plurality of periods in the first integrator 42. If the sensor point voltage of the sensor device 16 deviates from the upper limit value of the appropriate range, the integrated value output from the first integrator 42 is a negative value. If the sensor point voltage of the sensor device 16 does not deviate from the upper limit value of the appropriate range, the integrated value output from the first integrator 42 is a positive value. The first limiter 43 outputs a negative integrated value if the integrated value output from the first integrator 42 is a negative value (the sensor point voltage deviates from the upper limit value). If the integrated value output from the integrator 42 is a positive value (the sensor point voltage does not deviate from the upper limit value), 0 is output. Thereby, a negative virtual output is output when the sensor point voltage of the adjacent sensor device 16 deviates from the upper limit of the appropriate range. Next, the virtual output calculation based on the lower limit deviation will be described. The SSSC 14 acquires the sensor point voltage of the sensor device 16, and adds / subtracts the sensor point voltage acquired by the second adder / subtractor 44 as a negative value and the appropriate range lower limit value of the sensor point voltage as a positive value. The calculation result is accumulated for a plurality of periods in the second integrator 45. If the sensor point voltage of the sensor device 16 deviates from the lower limit value of the appropriate range, the integrated value output from the second integrator 45 is a positive value. If the sensor point voltage of the sensor device 16 does not deviate from the lower limit value of the appropriate range, the integrated value output from the second integrator 45 is a negative value. The second limiter 46 outputs a positive integrated value if the integrated value output from the second integrator 45 is a positive value (the sensor point voltage has deviated from the lower limit value). If the integrated value output from the integrator 45 is a negative value (the sensor point voltage does not deviate from the lower limit value), 0 is output. As a result, when the sensor point voltage of the adjacent sensor device 16 deviates from the lower limit value of the appropriate range, a positive virtual output is output. The outputs (0, negative value, positive value) of the first and second limiters 43 and 46 are input to the adder 47, and either 0, negative value, or positive value is used as a virtual output in the subsequent stage. Given to processing. When the sensor point voltage of the sensor device 16 is within the appropriate range, 0 is output as a virtual output, and if the sensor point voltage is deviating from the upper limit value, the negative value works to decrease the voltage as a virtual output. Is output, and if the sensor point voltage deviates from the lower limit value, a “positive value” that works to increase the voltage as a virtual output is output.

(Second Embodiment)
Next, an embodiment of a series voltage regulator that keeps the sensor point voltage of a sensor device as an adjacent device within an appropriate range by a protection mechanism will be described. The series voltage regulator of this embodiment (for example, SSSC) calculates a voltage deviation amount from an appropriate voltage of a sensor device that is an adjacent device, and outputs the voltage deviation amount so as to approach 0 (or a predetermined value). The command value is configured to be updated. Specifically, by changing the upper and lower limit values of the protection mechanism according to the voltage deviation amount from the appropriate range of the sensor point voltage in the sensor device, output is performed so that the voltage deviation amount of the sensor point voltage can approach 0. Update the command value. The protection operation for the voltage command value is the same as the operation when the secondary voltage of the SSSC 14 described in the first embodiment deviates from the upper limit. The overall configuration of the power system will be described based on the configuration example shown in FIG. 1, but the present invention is not limited to the configuration example shown in FIG. 1. The SSSC 14 serving as a series voltage regulator constructs a cooperative control system that can acquire the sensor point voltage of the sensor device 16 serving as an adjacent device.

FIG. 11 shows a protection mechanism in the SSSC 14 serving as the series voltage regulator of this embodiment.
The SSSC 14 serving as a series voltage regulator obtains information on the upper limit value and the lower limit value of the appropriate range of the sensor point voltage in the sensor device 16. The SSSC 14 acquires the sensor point voltage of the sensor device 16 that is an adjacent device at a certain communication cycle. The acquired sensor point voltage is input to the first adder / subtractor 51 as a negative value and the upper limit value of the adjacent sensor device 16 as a positive value. If the acquired sensor point voltage deviates from the upper limit value of the sensor device 16, a negative value is subjected to a proportional integration operation in the first proportional integration element 52 and then given to the limiter 53 as a limiter upper limit value. On the other hand, the acquired sensor point voltage is input to the second adder / subtractor 54 as a negative value, and the lower limit value of the adjacent sensor device 16 as a positive value. If the acquired sensor point voltage deviates from the lower limit value of the sensor device 16, a positive value is proportionally integrated in the second proportional integration element 55 and then given to the limiter 53 as a limiter upper limit value. The limiter 53 is a protection mechanism that limits the operating range of the voltage command value in the SSSC 14 to an appropriate range. The upper limit of the appropriate range is dynamically indicated as the limiter upper limit value, and the lower limit of the appropriate range is dynamically set as the limiter lower limit value. Instructed. In such a limiter mechanism, when the sensor point voltage deviates from the upper limit value of the sensor device 16, the limiter upper limit value of the limiter 53 is lowered and the voltage command value of the SSSC 14 is lowered. If the voltage command value of the SSSC 14 decreases, the voltage of the entire control target section including the sensor points of the sensor device 16 in the control target section of the SSSC 14 decreases, so the sensor point voltage of the sensor device 16 deviates from the upper limit value. The state is returned to the proper range. On the other hand, in the situation where the sensor point voltage deviates from the lower limit value of the sensor device 16, the limiter lower limit value of the limiter 53 is increased and the voltage command value of the SSSC 14 increases. If the voltage command value of the SSSC 14 increases, the voltage of the entire control target section including the sensor points of the sensor device 16 in the control target section of the SSSC 14 increases, so the sensor point voltage of the sensor device 16 deviates from the lower limit value. The state is returned to the proper range.

  As described above, by controlling the limiter upper limit value and limiter lower limit value of the limiter 53 with respect to the voltage command value in the SSSC 14 serving as the series voltage regulator, according to the deviation state of the sensor point voltage in the sensor device 16, Thus, the sensor point voltage of the sensor device 16 can be kept within an appropriate range.

  In the present embodiment, the SSSC 14 is described as an example of the series voltage regulator, but the present invention can be similarly applied to other series voltage regulators such as LRT and SVR.

11 Constant voltage power supply 12 LRT
13 Distribution line 14 SSSC
15 SVC
16 Sensor device 17 Consumer 18 Solar power generation device 31 Proportional element 32 Delay element
33 Addition element 34 Protection limiter 41, 51 First adder / subtractor 42 First integrator 43 First limiter 44, 54 Second adder / subtractor 45 Second integrator 46 Second limiter 47 Adder 52 First proportional integral element 55 Second proportional integral element 53 Limiter

Claims (5)

A series voltage regulator connected in series to a power distribution system,
A series-type voltage regulator that changes an output command value so that the output of the adjacent device approaches 0 or a predetermined value based on output information of the local device and the adjacent device.   The adjacent device is a parallel voltage regulator connected in parallel to the power distribution system, and obtains reactive power output information output by the parallel voltage regulator to reduce the output of the parallel voltage regulator to 0. 2. The series voltage regulator according to claim 1, wherein the output command value is changed so as to approach a predetermined value.   2. The series voltage regulator according to claim 1, wherein an output command value is determined based on proportional control or proportional integral control from a deviation between an output of the adjacent device and a target value.   2. The serial type according to claim 1, wherein the adjacent device is a sensor device connected to the power distribution system, and an output command value is changed so that a virtual output of the sensor device is close to 0 or a predetermined value. Voltage regulator. The series voltage regulator according to claim 4, wherein an amount of deviation from an appropriate range of the installation point voltage of the sensor device is used as a virtual output of the sensor device.

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