JP2016082860A - Wind turbine power generation system, wind turbine power generation method, wind turbine generator control device and wind turbine generator control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind turbine generator control device and method for maintaining composite output constant by controlling a wind turbine power generation amount on the basis of a wind turbine output suppression value and cooperating a charge/discharge instruction to a storage battery based on a differential between a composite output target value and the wind turbine power generation amount, and a wind turbine power generation system and method.SOLUTION: The wind turbine generator control device comprises a wind turbine output suppression value creation part 30 for creating a wind turbine output suppression value 31 by adding the differential between a power storage amount target value for wind turbine output suppression and a power storage amount 6 at a present time point and a composite output target value 21 that is output from a composite output target value generation part 20. The wind turbine output suppression value creation part 30 inputs the wind turbine suppression value 31 to a wind turbine generator WT(3), thereby suppressing a power generation amount of the wind turbine generator WT(3). A differential between the composite output target value 21 that is generated by the composite output target value generation part 20, and the wind turbine power generation amount 4 is calculated by a subtractor 22 and the differential is inputted to a bidirectional converter 41 as a charge/discharge command value 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wind turbine power generation system and method having a wind turbine power generation device and a power storage device capable of suppressing output, and a wind turbine generator control device and method.

  In order to prevent the influence of the fluctuation of the output of the wind turbine generator from the connected power system, it is necessary to smooth the output using a power storage device or the like. A technique is known in which a combined output (system output) of a wind turbine generator and a power storage device is made constant by using a power storage device for smoothing.

In that case, since the difference between the target value of the combined output to be constant and the wind turbine generated power is all absorbed by charging / discharging of the power storage device, the load on the power storage device increases.
In addition, if the target value of the combined output to be constant and the actual wind turbine power generation amount deviate beyond the capacity of the power storage device, it becomes difficult to make the combined output constant.

  The wind power generation control device in the conventional constant power control type wind power generation system described in Patent Document 1 below calculates the average value of the wind power generation power in the control period before the current time, and calculates the average value of the calculated wind power generation power Is set as the wind power generation plan value, the charge rate of the storage battery as the current power storage device is compared with the target range of the charge rate, and if within the target range, the average value is set as the power generation plan value. Is set as the power generation plan value when the average value of the generated power is multiplied by a positive constant larger than 1, and when the average value of the generated power is below the target range, a positive constant smaller than 1 is set. By controlling so as to set a value obtained by multiplying as a power generation planned value, the storage capacity of the storage battery system of the constant output control type wind power plant is reduced, and the installation cost is reduced.

JP 2014-36538 A

  The technique disclosed in Patent Literature 1 described above absorbs all the difference between the power generation plan value and the wind turbine power generation amount by charging / discharging the storage battery as the power storage device, and thus the difference between the power generation plan value and the wind turbine power generation amount. However, if the output limit of charge / discharge of the power storage device is exceeded, there is a problem that the combined output cannot be maintained constant.

  Accordingly, an object of the present invention is to maintain the constant composite output by controlling the wind turbine power generation amount based on the wind turbine output suppression value and coordinating the charge / discharge instruction to the storage battery based on the difference between the composite output target value and the wind turbine power generation amount. A wind turbine power generation system and method, and a wind turbine generator control apparatus and method are provided.

  In order to solve this problem, the invention according to claim 1 is a wind turbine generator control device in a wind turbine power generation system having a wind turbine power generation device capable of suppressing output and a power storage device, and the wind turbine generator control device includes: A value or power storage device obtained by obtaining a difference between a storage amount target value of a power storage device for wind turbine output suppression and a current storage amount, dividing the difference by a predetermined time, and then limiting it via a limiter Is set by the combined output of the wind turbine power generation amount to the power grid and the power storage amount of the power storage device to one of the low values obtained by multiplying the chargeable kW (electric power) by a predetermined coefficient The power generation amount of the wind turbine generator is controlled based on a wind turbine output suppression value calculated by adding the output target values.

  According to a second aspect of the present invention, in the wind turbine generator control device according to the first aspect, the combined output target value includes an expected wind turbine power generation amount, a power storage amount target value of the power storage device, and a current power storage amount. The difference is set by dividing the difference by a predetermined time and adding the result multiplied by a predetermined coefficient.

According to a third aspect of the present invention, in the wind turbine generator control device according to the first aspect,
The composite output target value is a comparison between the storage rate of the current power storage device and the storage rate target range,
If the storage rate is within the target range, the average value of past wind power generation,
When the storage rate exceeds the target range, a value obtained by multiplying the average value of the wind power generation amount by a positive constant greater than 1,
When the storage rate falls below the target range, the average value of the wind power generation amount is set to a value obtained by multiplying a positive constant smaller than 1.

  In order to solve the above-mentioned problem, the invention according to claim 4 is a wind turbine generator control method for a wind turbine generator in a wind turbine generator system having a wind turbine generator capable of suppressing output and a power storage device, wherein the wind turbine generator Is the value or power obtained by obtaining the difference between the target storage amount of the power storage device for suppressing the wind turbine output and the current storage amount, dividing the difference by a predetermined time, and limiting it via the limiter Set to a low value of any value obtained by multiplying the chargeable kW (electric power) of the storage device by a predetermined coefficient, based on the combined output of the wind turbine power generation amount to the power grid and the power storage amount of the power storage device. The power generation amount of the wind turbine generator is controlled based on a wind turbine output suppression value calculated by adding the combined output target values.

In order to solve the above-mentioned problem, the invention according to claim 5 is a wind turbine power generation system having a wind turbine power generation device capable of suppressing output and a power storage device. Either the value obtained by calculating the difference, dividing the difference by a predetermined time and then limiting it via the limiter, or the value obtained by multiplying the chargeable kW (electric power) of the power storage device by a predetermined coefficient Means for calculating the wind turbine output suppression value by adding the combined output target value set by the combined output of the wind turbine power generation amount to the power grid and the power storage amount of the power storage device to the low value of
Means for inputting the calculated wind turbine output suppression value into the wind turbine generator and controlling the power generation amount of the wind turbine;
Means for inputting the difference between the combined output target value and the wind turbine power generation amount to the power storage device as a charge / discharge command value;
And a means for controlling the amount of electricity stored in the power storage device based on the charge / discharge command value and outputting it to a connection point of the power system.

  In order to solve the above-mentioned problem, an invention according to claim 6 is a wind turbine power generation method in a wind turbine power generation system having a wind turbine power generation device capable of suppressing output and an electric power storage device, and a storage amount target value for suppressing wind turbine output. Is calculated by dividing the difference by a predetermined time and then limiting the value via a limiter or multiplying the chargeable kW (electric power) of the power storage device by a predetermined coefficient. The wind turbine output suppression value is calculated by adding the combined output target value set by the combined output of the wind turbine power generation amount to the power grid and the power storage amount of the power storage device to any low value of the obtained value A process, a process of inputting the calculated wind turbine output suppression value to the wind turbine power generator to control the power generation amount of the wind turbine, a process of inputting a difference between the combined output target value and the wind turbine power generation amount to the power storage device as a charge / discharge command value And the charge / discharge finger And a process of controlling the amount of electricity stored in the power storage device based on the command value and outputting it to a connection point of the power system.

  In order to solve the above-mentioned problem, the invention according to claim 7 is a wind turbine power generation method for setting a storage amount target value in a wind turbine power generation system having a wind turbine power generation device capable of suppressing output and a power storage device. Power storage target value for correcting the combined output target value set by the combined output of the wind turbine power generation amount and the power storage amount of the power storage device, the operation lower limit storage amount, and the power storage device power storage for wind turbine output suppression It is characterized by being between the quantity target values.

  According to the present invention, the wind turbine power generation amount is controlled based on the wind turbine output suppression value, and the combined output constant is maintained by coordinating the charge / discharge instruction to the storage battery based on the difference between the combined output target value and the wind turbine power generation amount. It becomes possible.

It is a figure which shows the structure of the windmill electric power generation system which stabilizes a synthetic | combination output based on the windmill output suppression value which concerns on embodiment of this invention. It is a block diagram which shows the detailed structure of the windmill output suppression value preparation part shown in FIG. It is a figure which shows the setting image of the electrical storage amount target value for windmill output control which concerns on embodiment of this invention. It is a block diagram which shows the detailed structure for the setting of the synthetic | combination output target value which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a diagram illustrating a configuration of a wind turbine power generation system that stabilizes a combined output based on a wind turbine output suppression value according to an embodiment of the present invention. In FIG. 1, the wind turbine power generation system that stabilizes the combined output based on the wind turbine output suppression value according to the embodiment of the present invention basically includes a wind turbine generator WT (3) illustrated in the figure, a power storage device 40, The power stabilizing device 1 is configured to control them so as to keep the combined output 2 that is output to the grid, that is, the power to the interconnection point, constant.

  The combined output target value generation unit 20 in the power stabilizing device 1 receives the wind turbine power generation amount 4 of the wind turbine generator WT (3) as an input, for example, the method disclosed in Patent Document 1 described above, specifically, the combined output. In the target value generation unit 20, the current storage rate of the power storage device and the storage rate target range are compared. If the storage rate is within the target range, the average value of past wind power generation or the storage rate is When exceeding the target range, the average value of the wind power generation amount is multiplied by a positive constant greater than 1, or when the storage rate is below the target range, the average value of the wind power generation amount is calculated. The composite output target value 21 is generated by setting to any value multiplied by a positive constant smaller than 1. The subtractor 22 has a configuration for obtaining a difference between the combined output target value 21 and the wind turbine power generation amount 4. The difference between the combined output target value 21 and the wind turbine power generation amount 4 is input to the bidirectional converter 41 as the charge / discharge command value 5. This will be described later.

  In addition, in FIG. 1, the wind turbine power generation system that stabilizes the combined output based on the wind turbine output suppression value according to the embodiment of the present invention has a storage amount target value 7 (which will be described later) for wind turbine output suppression and a current A wind turbine output suppression value creation unit 30 that creates a wind turbine output suppression value 31 by adding the difference from the charged amount 6 and the composite output target value 21 that is the output of the composite output target value generation unit 20 is included. The wind turbine output suppression value 31 created by the wind turbine output suppression value creation unit 30 is input to the wind turbine generator WT (3) to suppress the power generation amount of the wind turbine generator WT (3). The details of the wind turbine output suppression value creating unit 30 will be described later.

  In FIG. 1, the wind turbine power generation system that stabilizes the combined output based on the wind turbine output suppression value according to the embodiment of the present invention includes a power storage device 40 that includes a bidirectional converter 41 and a storage battery 42. The bidirectional converter 41 is connected to the wind turbine generator WT (3) in which the output of the wind turbine generator 4 is suppressed to charge and discharge the electric power stored in the storage battery 42 to keep the combined output 2 constant. To supply power. Although not shown, the power storage device 40 includes a control device including a storage battery and a microcomputer that controls the bidirectional converter, and controls the bidirectional converter with the charge / discharge command value 5 as an input to charge / discharge. The current storage amount of the storage battery can be analog / digital converted and the current storage amount input / output control can be performed while controlling the amount.

  As is known to those skilled in the art, the goal of a wind turbine power generation system with a constant output is that the output to the grid takes into account the output state of the wind turbine power generator in which the generated power fluctuates with changes in the storage battery capacity and wind speed. In other words, although the resultant output (system output) 2 is controlled to be constant, nothing is perfect yet, and various things have been proposed in the process of reaching the goal of the wind turbine power generation system with constant output. The power storage device 40 includes, in addition to the illustrated bidirectional converter 41, a storage battery (for example, a lead battery, a lithium ion battery, a redox flow battery) 42 as a storage amount holding means, a high-performance capacitor such as an electric double layer capacitor, Alternatively, a flywheel or the like can be used.

  FIG. 2 is a block diagram illustrating a detailed configuration of the wind turbine output suppression value creation unit 30 illustrated in FIG. 1. In FIG. 2, the wind turbine output suppression value creating unit 30 calculates a difference between a preset storage amount target value 7 for wind turbine output suppression (described later) and the current storage amount 6 by a subtractor 8. Here, the storage amount target value 7 for suppressing the wind turbine output is a predetermined value on the coordinate axis based on the combined output target value 21 generated by the combined output target value generation unit 20 as shown in FIG. 3 described later. It is defined as a storage amount, and is set to a value lower than the operation upper limit storage amount (with margin) 37. Then, after dividing the above-described difference (output of the subtractor 8) by a predetermined time (eg, 1 hour or more and less than 3 hours) T1 (9) by the divider 11, the upper / lower limiter 12 is used. To the first input value of the selector 35.

  On the other hand, as shown in FIG. 3 to be described later, the polarity of the rechargeable kW (electric power) 32 of the storage battery is converted (polarity conversion) in which plus / minus is defined with respect to the coordinate axis based on the composite output target value 21. The second input value of the selector 35 is obtained by multiplying the coefficient K between 0 and 1 (the output of the multiplier 34).

The selector 35 compares the first input value with the second input value and adopts the low value as one input of the adder 36.
The combined output target value 21 described above is input to the other input of the adder 36, and the wind turbine output suppression value 31 is obtained by adding together the adder 36. And the output windmill output suppression value 31 is input into the windmill generator WT (3) shown in FIG.

  Based on the wind turbine output suppression value 31 input to the wind turbine generator WT (3), the wind turbine generator control unit (not shown) suppresses the wind turbine power generation amount 4 of the wind turbine generator WT (3). The charge / discharge command value 5 output from the 1 subtractor 22 is input to the bidirectional converter 41, and charge / discharge is further controlled by the bidirectional converter 41 to maintain the output of the combined output (interconnection point power) 2 constant. Will be.

  Then, the storage amount of the storage battery 42 is controlled according to the charge / discharge command value 5 from the subtractor 22 shown in FIG. 1, and the current storage amount 6 output from the bidirectional converter 41 is the combined output target value generation unit 20 and A control loop for controlling the wind turbine power generation amount based on the wind turbine output suppression value and charging / discharging control of the power storage device based on the wind turbine power generation amount and the combined output target value by being input to the wind turbine output suppression value creating unit 30 Are formed, and the synthesized output 2 is stably maintained.

  FIG. 3 is a diagram illustrating a setting image of a storage amount target value for wind turbine output suppression according to the embodiment of the present invention. In general, in the case of a constant output type wind turbine power generation system, when the value obtained by subtracting the composite output target value from the wind turbine power generation amount exceeds the chargeable kW (electric power) of the storage battery, the composite output cannot be maintained constant.

  Therefore, in the wind turbine power generation system that stabilizes the combined output based on the wind turbine output suppression value according to the embodiment of the present invention, the chargeable amount of the storage battery (kW) multiplied by the coefficient K in the range of 0 to 1, By adding the fixed composite output target value and setting it as the wind turbine output suppression value, the value obtained by subtracting the composite output target value from the wind turbine power generation amount does not exceed the chargeable kW (electric power) of the storage battery.

  As a result, there is no case where the combined output cannot be maintained due to insufficient chargeable kW (electric power) of the storage battery. The factor K in the range of 0 to 1 is multiplied by the delay in wind turbine generator control (for example, pitch angle control that suppresses output by adjusting the angle of the blades of the wind turbine) by the wind turbine generator controller (not shown). This is to allow for a sufficient capacity of the storage battery in consideration.

  When the wind turbine power generation system of the present invention described above is summarized, the wind turbine power generation amount is controlled based on the wind turbine output suppression value and the charge / discharge instruction to the storage battery according to the difference between the combined output target value and the wind turbine power generation amount is coordinated. By doing so, the composite output can be maintained constant.

  FIG. 4 is a block diagram showing a detailed configuration for setting the composite output target value according to the embodiment of the present invention. The composite output target value 21 is based on a wind turbine output amount 23 that is expected based on the wind conditions and the like, and the difference between the storage amount target value 24 and the current storage amount 6 is a predetermined time (eg, 1 hour to 3 hours). (Less than) divided by 25 and multiplied by the coefficient K1 (by a multiplier 27) can be obtained.

The storage amount target value 24 is set to be smaller than the storage amount target value upper limit value 37 of FIG. 3 so as not to compete with the storage amount target value 7 for suppressing the wind turbine output shown in FIG.
Further, in order to secure a storage amount that can maintain constant output control, the storage amount target value for correcting the composite output target value is set above the operation lower limit storage amount (with margin) in FIG. It is set to be smaller than the upper limit of the target value 24.

1 Power stabilizer 2 Combined output (interconnection point power)
3 Wind turbine generator (WT)
4 Windmill power generation 5 Charge / discharge command value 6 (Current) storage amount 7 Storage amount target value 8 Subtractor 9 Time (T1)
11 Divider 12 Upper / Lower Limiter 20 Combined Output Target Value Generation Unit 21 Combined Output Target Value 22 Subtractor 23 Expected Windmill Output Amount 24 Accumulated Charge Target Value 25 Certain Time 26 Divider 27 Multiplier 30 Windmill Output Suppression Value creation unit 31 Wind turbine output suppression value 32 Rechargeable storage battery kW (electric power)
33 Polarity converter 34 Multiplier 35 Selector 36 Adder 37 Maximum operating charge (with margin)
40 Power Storage Device 41 Bidirectional Converter 42 Storage Battery

Claims (7)

  A wind turbine generator control device in a wind turbine power generation system having a wind turbine power generation device capable of suppressing output and a power storage device, the wind turbine generator control device including a target storage amount of the power storage device for suppressing wind turbine output, Find the difference from the current power storage amount, divide the difference by a predetermined time, and then limit the value via the limiter or multiply the chargeable kW (electric power) of the power storage device by a predetermined coefficient. Wind turbine output suppression value calculated by adding the combined output target value set by the combined output of the wind turbine power generation amount to the power grid and the power storage amount of the power storage device to any low value of the obtained value A wind turbine generator control device that controls the power generation amount of the wind turbine power generation device based on the above. In the wind turbine generator control device according to claim 1,
The combined output target value is obtained by adding the expected wind turbine power generation amount, the difference between the target storage amount value of the power storage device and the current storage amount by a predetermined time, and multiplying by a predetermined coefficient. Set by
A wind turbine generator control device characterized by that. In the wind turbine generator control device according to claim 1,
The composite output target value is a comparison between the storage rate of the current power storage device and the storage rate target range,
If the storage rate is within the target range, the average value of past wind power generation,
When the storage rate exceeds the target range, a value obtained by multiplying the average value of the wind power generation amount by a positive constant greater than 1,
When the storage rate is below the target range, it is set to a value obtained by multiplying the average value of the wind power generation amount by a positive constant smaller than 1.
A wind turbine generator control device characterized by that.   A wind turbine generator control method for a wind turbine generator in a wind turbine generator system having a wind turbine generator capable of suppressing output and a power storage device, wherein the wind turbine generator is a storage amount target of the power storage device for suppressing wind turbine output Calculate the difference between the current value and the current storage amount, divide the difference by a predetermined time, and then limit the value via a limiter or multiply the chargeable kW (electric power) of the power storage device by a predetermined coefficient. The wind turbine output calculated by adding the combined output target value set by the combined output of the wind turbine power generation amount to the power grid and the power storage amount of the power storage device to one of the low values obtained A wind turbine generator control method, comprising: controlling a power generation amount of the wind turbine generator based on a suppression value. In a wind turbine power generation system having a wind turbine power generation device and an electric power storage device capable of suppressing output, after obtaining the difference between the storage amount target value for suppressing the wind turbine output and the current storage amount, and dividing the difference by a predetermined time The wind turbine power generation amount and power storage to the power system are reduced to either the value obtained by limiting through the limiter or the value obtained by multiplying the chargeable kW (power) of the power storage device by a predetermined coefficient. Means for calculating the wind turbine output suppression value by adding the combined output target value set by the combined output with the power storage amount of the device;
Means for inputting the calculated wind turbine output suppression value into the wind turbine generator and controlling the power generation amount of the wind turbine;
Means for inputting the difference between the combined output target value and the wind turbine power generation amount to the power storage device as a charge / discharge command value;
Means for controlling the amount of electricity stored in the power storage device based on the charge / discharge command value and outputting it to a connection point of the power system;
A wind turbine power generation system comprising:   A wind turbine power generation method in a wind turbine power generation system having a wind turbine power generation device and a power storage device capable of suppressing output, wherein a difference between a storage amount target value for suppressing the wind turbine output and a current storage amount is obtained, and the difference is determined to be a predetermined value. Divide by time and limit the value via the limiter or the value obtained by multiplying the chargeable kW (electric power) of the power storage device by the predetermined coefficient, The process of calculating the wind turbine output suppression value by adding the combined output target value set by the combined output of the wind turbine power generation amount and the power storage amount of the power storage device, and inputting the calculated wind turbine output suppression value to the wind turbine power generation device. The process of controlling the power generation amount of the wind turbine, the process of inputting the difference between the combined output target value and the wind turbine power generation amount as a charge / discharge command value to the power storage device, and the power storage device based on the charge / discharge command value To control the amount of electricity stored A wind turbine power generation method comprising: outputting to a connection point of a power system.   A wind turbine power generation method for setting a storage amount target value in a wind turbine power generation system having a wind turbine power generation device and a power storage device capable of suppressing output, and combining the wind turbine power generation amount to the power system and the power storage amount of the power storage device A wind turbine characterized in that a storage amount target value for correcting a composite output target value set by an output is between an operation lower limit storage amount and a storage amount target value of a power storage device for wind turbine output suppression Power generation method.

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