JP2022190741A - Renewable energy power generation system and control method for renewable energy power generation system - Google Patents

Abstract

To restrain overshoots of output with respect to output upper limit values of renewable energy power generators.SOLUTION: A wind energy power generation system comprises a plurality of power generators 6 for generating power by wind energy, and a control device 11 for controlling output of the power generators 6. The control device 11 comprises a variance calculation unit 152 for calculating variance values of operation conditions of the power generators, and an adjustment unit 158 for adjusting limit command values to be outputted to the respective power generators 6, in accordance with the respective variance values.SELECTED DRAWING: Figure 3

Description

The present invention relates to a renewable energy power generation system such as wind power generation and a control method thereof.

Energy consumption continued to increase along with global economic growth, reaching 3.3 times in the approximately 50 years from 1965 to 2015. In addition, as an energy source that provides electric power instead of fossil fuels, the introduction rate of renewable energy such as solar power generation and wind power generation is increasing all over the world. Japan has set a goal of increasing the renewable energy ratio to 22-24% by 2030.

A wind turbine generator converts the kinetic energy of wind into rotational energy of a rotor, and further converts the rotational energy of the rotor into electric power by means of a generator. A wind power generator is interconnected to a power system, and electric power generated by the wind power generator is often supplied to the power system. It is known that the frequency of the power system is determined by the power supply and demand balance.

In other words, when the amount of power generated exceeds the power demand, the generator connected to the power system tries to store the excess power in the power system as rotational energy, resulting in an increase in the rotational speed of the generator (that is, the system frequency). . Conversely, when the amount of power generated falls below the power demand, the generators connected to the power system will release rotational energy to compensate for the power shortage in the power system. decreases.

As described above, with the expansion of the introduction of renewable energy, there is an increasing need for adjustment power to cope with sudden output fluctuations, small output fluctuation prediction errors, supply and demand balance during periods of low electric power demand, and so on. Therefore, grid codes are being developed, and limits are being set on the rate of increase associated with output fluctuations, such as the maximum fluctuation range for 5 minutes at the interconnection point being 10% or less of the installed capacity of the power plant.

Therefore, when connecting renewable energy to an interconnection line, an upper limit value of allowable generated power is set. At each power generation site in a renewable energy power generation system, it is necessary to design power generation facilities so that the generated power is equal to or less than the upper limit. However, the amount of power generated by a renewable energy power generation system fluctuates depending on weather conditions such as the amount of solar radiation and wind speed. Therefore, in order to keep the grid code and minimize the loss, it is necessary not to apply a constant limiter to the fluctuating output, but to change the output according to the control.

For example, Patent Literature 1 describes a method of changing the control method with respect to the output. According to this control method, when the difference between the output and the output upper limit value is large, the maximum output rate is set large, and the time required to reach the vicinity of the output upper limit value can be shortened. Furthermore, when the difference is small, the output rate can be reduced to suppress overshoot. However, if the rate is increased when the difference between the output and the output upper limit value is large, the output may suddenly increase depending on the wind conditions, resulting in a large overshoot.

Japanese Patent No. 5216167

The wind turbine generator can control its own generated power on average with respect to the output limit value. However, in the wind turbine generator, the generated power pulsates by several percent due to temporal fluctuations in wind speed and wind direction. In particular, when the wind speed increases rapidly, the power generated by the wind power generator becomes larger than the amount of output pulsation during normal times, and may exceed the upper limit of the output. If a simple limiter control is applied to the output, overshoot may occur at the point where the output exceeds the upper limit. Also, if the upper limit value is set lower so that the excess does not increase, the amount of power generated will decrease and the loss will increase.

Then, this invention is made|formed in view of the above-mentioned situation, and makes it a subject to suppress the overshoot of the output with respect to the output upper limit of a renewable energy generator.

In order to solve the above-described problems, the renewable energy power generation system of the present invention includes a plurality of generators that generate power using renewable energy, and a control device that controls the output of the generators. A variance calculation unit that calculates a variance value of the operating state of the generator, and an adjustment unit that adjusts a limit command value to be output to each generator according to each variance value.

In the method for controlling a renewable energy power generation system of the present invention, a control device for controlling the output of a plurality of generators that generate power using renewable energy calculates a variance value of the operating state of each of the generators; adjusting a limit command value to be output to each generator according to each variance value.
Other means are described in the detailed description.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the overshoot of the output with respect to the output upper limit of a renewable energy generator.

It is a block diagram of the wind power generation system in this embodiment. It is a block diagram of each windmill. It is a block diagram of the control device of each wind power generator. 4 is a graph for explaining the operation of a tolerance calculation unit; 4 is a flowchart of control command value adjustment processing by a control device; 4 is a graph showing power generation output in a state in which no control command value is output; 4 is a graph showing an original control command value, a control command value, and a power generation output; FIG. 11 is a flowchart of control command value adjustment processing according to a first modification; FIG. FIG. 11 is a flowchart of control command value adjustment processing according to a second modification; FIG. It is a block diagram of the wind power generator and control apparatus of a comparative example. 7 is a graph showing an original control command value, a control command value, and a power generation output in a comparative example;

EMBODIMENT OF THE INVENTION Henceforth, the form for implementing this invention is demonstrated in detail with reference to each figure.
FIG. 1 is a block diagram of a wind power generation system 1 according to this embodiment.
The wind power generation system 1 includes a plurality of wind turbines 20a to 20n and a controller 11 thereof. Each of the windmills 20a-20n has a generator 6 and is connected to a control device 11. FIG. Thereby, the control device 11 controls each generator 6 .

These generators 6 generate power using wind energy.

Each of the wind turbines 20a-20n further comprises a wind direction and speed sensor 7, a power converter 10, and a rotation speed sensor 12, each of which is connected to a control device 11. FIG.
The wind sensor 7 measures wind direction and wind speed and outputs the measurement results to the control device 11 .
The power converter 10 controls the torque generated by the generator 6 (hereinafter referred to as generator torque) and outputs the measured value of this generator torque to the control device 11 .
A rotation speed sensor 12 measures the rotation speed of the generator 6 and outputs this rotation speed information to the control device 11 .

The control device 11 controls the output of each generator 6 . For the control device 11, for example, a control panel or SCADA (Supervisory Control And Data Acquisition) is used. The control device 11 includes a processor such as a CPU (Central Processing Unit) (not shown), a ROM (Read Only Memory) that stores various programs, a RAM (Random Access Memory) that temporarily stores data in the process of calculation, an external It is configured including a storage device such as a storage device. In the control device 11, a processor such as a CPU reads and executes various programs stored in the ROM, and stores the calculation results, which are the execution results, in the RAM or an external storage device.

FIG. 2 is a configuration diagram of the wind turbine 20a.
In FIG. 2 , a wind turbine 20 a includes a nacelle 5 and a rotor 4 installed on a tower 9 and a power converter 10 installed inside the tower 9 and connected to a control device 11 . The windmill 20 a is one of the windmills that constitute the wind power generation system 1 .

The rotor 4 is composed of a plurality of blades 2 that receive wind and a hub 3 that connects the plurality of blades 2 . The rotor 4 is connected to the nacelle 5 via a rotating shaft, and can change the position of the blades 2 by rotating.

The nacelle 5 rotatably supports the rotor 4 . When the blades 2 receive the wind, the rotor 4 rotates, and the rotational force of the rotor 4 rotates the generator 6 housed in the nacelle 5 to generate electric power. Installed on the nacelle 5 are a wind sensor 7 for measuring wind direction and wind speed, and a rotation speed sensor 12 for measuring the rotation speed of the generator 6 .

Each blade 2 is provided with a pitch angle driving device 8 capable of adjusting the angle (pitch angle) of the blade 2 with respect to the wind. By changing the pitch angle of the pitch angle driving device 8, the wind force (air volume) received by the blades 2 is adjusted, and the rotational energy of the rotor 4 against the wind can be changed. This makes it possible to control the rotation speed and generated power in a wide range of wind speeds.

In the wind turbine 20 a , the nacelle 5 is installed on the tower 9 and has a mechanism (not shown) that can rotate with respect to the tower 9 . The tower 9 supports the load of the blades 2 via the hub 3 and the nacelle 5, and is fixed to a base (not shown) installed at a predetermined position such as on the ground, on the sea, or on a floating body.

The power converter 10 controls the generator torque generated by the generator 6 and thus the rotational torque of the rotor 4 .

The wind power generation system 1 also includes a control device 11 common to the wind turbines 20a to 20n. The control device 11 adjusts the generator 6 and the pitch angle driving device 8 based on the rotation speed of the generator 6 output from the rotation speed sensor 12 and the generator torque output from the power converter 10 . Thereby, the control device 11 adjusts the generated power and the rotation speed of the wind power generation system 1 .

FIG. 3 is a block diagram of the control device 11. As shown in FIG.
The control device 11 controls the output _Pw of the generator 6 so that the rate of increase associated with the output fluctuation is less than or equal to the limit. The generator 6 generates power upon receiving a control command value from the control device 11, and outputs the generated power to the interconnection line. The control device 11 includes a power generation output storage unit 13 , an original limit command value output unit 14 , and a limit command calculation unit 15 .
The output _Pw of the generator 6 is input to the control device 11 . The control device 11 _resets the original limit command value _Pb to the limit command value Pa based on the output _Pw of the generator 6 and the like. This limit command value _{Pa is an output upper limit value that limits the upper limit of the output Pw of} the generator 6 .

The power generation output storage unit 13 receives the output _Pw , which is the detected value of the power generation amount of the generator 6 , stores this output _Pw , and outputs it to the limit command calculation unit 15 .
The original limit command value output unit 14 outputs the original limit command value _Pb , which is the output upper limit value of the wind force, to the limit command calculation unit 15 .

The limit command calculator 15 includes a comparator 151 , a variance calculator 152 and an adjuster 158 . The adjuster 158 further includes a tolerance calculator 153 , multipliers 154 and 155 , an adder 156 and a switch 157 . The limit command calculation unit 15 calculates the limit command value P _a for the generator 6 based on the original limit command value P _b and the output P _w of the generator 6, and the calculation result, that is, the reset upper wind power output limit A value is commanded to the generator 6.

A comparator 151 compares the original limit command value _Pb with the output _Pw of the generator 6 and outputs the comparison result.
The variance calculator 152 calculates a variance value δ of a value obtained by subtracting the output _Pw of each generator 6 from the target output value of each generator 6 . From the variance value δ, it is detected that the power generated by the wind turbine generator can become larger than the amount of output pulsation in normal times. At this time, the controller 11 suppresses the limit command value _Pa to prevent overshoot due to pulsation of the output of the generator 6 .

Note that the variance calculation unit 152 may calculate the variance of the operating state of the generators 6. For example, the variance of the rotation speed of each generator 6, the variance of the wind force and/or wind direction in each windmill, and the variance of each The variance value of any one of the yaw error of the wind turbine, the pitch angle, and the turbulence intensity of the wind force may be calculated. These variance values also make it possible to detect that the power generated by the wind turbine generator can become larger than the output pulsation amount during normal times due to time fluctuations in the wind speed and wind direction.

The adjustment unit 158 adjusts the limit command value output to each generator 6 according to the variance value δ, and if the output _Pw of the generator 6 exceeds the original limit command value _Pb , the original limit command The value _Pb is output to each generator 6 as it is as the limit command value _Pa .
The latitude calculator 153 calculates the latitude α from the variance value δ. The relationship between the dispersion value δ and the tolerance α is, for example, as shown in the graph of FIG. 4 .

FIG. 4 is a graph for explaining the operation of the tolerance calculation unit 153, which will be explained with reference to FIG.
The vertical axis of the graph indicates the tolerance α. The horizontal axis of the graph indicates the dispersion value δ. When the variance value δ is smaller than the standard deviation σ (first variance value), for example, the latitude α is 1.0. The latitude α is zero when the variance value δ is greater than three times the standard deviation σ (second variance value). Then, when the variance value δ is between the standard deviation σ and 3σ, the latitude α changes linearly according to the variance value δ.

The variance value δ relates to this generator 6 among the operating states of the plurality of generators 6 . In other words, when the wind turbine equipped with this generator 6 is operated in a manner that is significantly different from that of the other wind turbines, the variance value δ increases. Specifically, this is the case where the output pulsation amount of the generator 6 is large. As a result, it is detected that there is a high probability that the output will suddenly increase due to the amount of output pulsation.

_Adjusting unit 158 then calculates limit command value Pa according to the following equation (1).

When the variance value δ is smaller than the standard deviation σ (first variance value), for example, the latitude α is 1.0. At this time, margin calculation section 153 outputs 0.0 to multiplier 154 and outputs 1.0 to multiplier 155 . As a result, the addition result of the adder 156 becomes equal to the original limit command value _Pb .

The latitude α is zero when the variance value δ is greater than three times the standard deviation σ (second variance value). At this time, margin calculation section 153 outputs 1.0 to multiplier 154 and outputs 0.0 to multiplier 155 . As a result, the addition result of the adder 156 becomes equal to the output _Pw of the generator 6 . This suppresses an increase in the output _Pw of the generator 6 when the output _Pw of the generator 6 is smaller than the original limit command value _Pb .

When the variance δ is between the standard deviation σ and 3σ, for example, when the variance δ is 2σ, α=0.5. At this time, margin calculation section 153 outputs 0.5 to multiplier 154 and outputs 0.5 to multiplier 155 . As a result, the addition result of the adder 156 becomes an intermediate value obtained by proportionally dividing the original limit command value _Pb and the output _Pw of the generator 6 by α. As a result, when the output _Pw of the generator 6 is smaller than the original limit command value _Pb , an increase in the output _Pw of the generator 6 is suppressed according to the variance value δ.

A switch 157 selects one of the addition result of the adder 156 and the original limit command value _Pb . Here, if the output _Pw of the generator 6 exceeds the original limit command value _Pb , the comparator 151 switches the switch 157 to the original limit command value _Pb side.

If the output _Pw of the generator 6 is equal to or less than the original limit command value _Pb , the comparator 151 switches the switch 157 to the addition result side of the adder 156 .

As shown in FIG. 4, the variance of the difference between the output _Pw of the generator 6 and the target output value is δ, and the vertical axis is α. do.

FIG. 5 is a flowchart of the control command value adjustment process by the control device 11 .
First, the comparison unit 151 determines whether or not the output _Pw of the generator 6 is greater than the original control command value _Pb (step S10). _If the output _Pw is larger than the original control command value _Pb (Yes), the process proceeds to step S11, and the adjustment unit 158 outputs the original control command value _Pb as it is as the limit command value Pa. exit.

If the output _Pw is equal to or less than the original control command value _Pb (No), the comparator 151 proceeds to step S12. Then, the variance calculator 152 calculates the variance value δ of the difference between the output _Pw of each generator 6 and the target output value (step S12). The latitude calculator 153 calculates the latitude α from the dispersion value δ (step S13). When the adjustment unit 158 divides the output _Pw of the generator 6 and the original control command value Pb proportionally by the tolerance α and outputs the limit command value _Pa (step S14), the process of _FIG . 5 is terminated.

FIG. 6 is a graph showing the output of the generator 6 when no control command value is output.
The horizontal axis of the graph indicates time, and the vertical axis indicates the output of the generator 6 .
At this time, the generator 6 outputs electric power according to the wind force. The output is therefore not constrained by P _min or the like.

FIG. 7 is a graph showing the original control command value, the control command value, and the power generation output.
The horizontal axis of the graph indicates time, and the vertical axis indicates the output of the generator 6, the original control command value, and the control command value.
Before time _T0 , the original control command value is _Pmin . The original control command value becomes P _min +10 from time T ₀ to T ₂ , and becomes P _min again after time T ₂ .
_For example, when the output _Pw of the generator ₆ exceeds the original control command value _Pb , as in _times T1 to T2, the limit command value _Pa becomes equal to the original control command value Pb.
Further, when the output _Pw of the generator ₆ is equal to or less than the original control command value _Pb , as in the time _T0 to T1, the limit command value _Pa is adjusted according to the dispersion value δ.

For example, if the difference between the output Pw of the generator 6 and the target output value is equivalent to _2σ of the variance of the output of the plurality of generators 6, then α=0.5, and the output P of the generator 6 An intermediate value between _w and the original control command value _Pb is output as the limit command value _Pa .

For example, if the difference between the output Pw of the generator 6 and the target output value is equivalent to _3σ of the variance of the output of the plurality of generators 6, α=0.0, and the output P of the generator 6 _w is output as a limit command value P _a to suppress deviation of the output P _w of the generator 6 from the value specified by the grid code. By using such a control method, it is possible to reduce overshoot and suppress an increase in loss.

Moreover, you may control renewable energy power generation facilities, such as solar power generation, using the said control system. That is, the present invention may be embodied as a renewable energy power generation system applied to power generation using renewable energy.
According to the present embodiment, it is possible to suppress the overshoot of the output with respect to the output upper limit value, and it is possible to suppress the decrease in the power generation amount and the increase in the loss due to excessive suppression.

FIG. 8 is a flowchart of the control command value adjustment process of the first modified example.
First, the comparison unit 151 determines whether or not the output _Pw of the generator 6 is greater than the original control command value _Pb (step S20). _If the output _Pw is greater than the original control command value _Pb (Yes), the comparison unit 151 proceeds to step S21, and the adjustment unit 158 outputs the original control command value _Pb as it is as the limit command value Pa. , the process of FIG. 8 ends.

If the output _Pw is equal to or less than the original control command value _Pb (No), the comparator 151 proceeds to step S22. Then, the variance calculator 152 calculates the variance δ of the wind speed and wind direction of each wind turbine. The latitude calculator 153 calculates the latitude α from the variance value δ (step S23). When the adjustment unit 158 divides the output _Pw of the generator 6 and the original control command value Pb proportionally by the tolerance α and outputs the limit command value _Pa (step S24), the process of _FIG . 8 ends.

FIG. 9 is a flowchart of the control command value adjustment process of the second modification.
First, the comparison unit 151 determines whether or not the output _Pw of the generator 6 is greater than the original control command value _Pb (step S30). _If the output _Pw is larger than the original control command value _Pb (Yes), the process proceeds to step S31, and the adjustment unit 158 outputs the original control command value _Pb as it is as the limit command value Pa. exit.

If the output _Pw is equal to or less than the original control command value _Pb (No), the comparator 151 proceeds to step S32. Then, the variance calculator 152 calculates the variance δ of the rotation speed of each wind turbine. The latitude calculator 153 calculates the latitude α from the variance value δ (step S33). The adjustment unit 158 divides the output _Pw of the generator 6 and the original control command value Pb proportionally by the tolerance α and outputs the limit command value Pa (step _S34 ), and terminates the processing of _FIG .

<<Comparative example>>
FIG. 10 is a block diagram of a control device 11A of a comparative example.
The control device 11A includes an output command value calculator 19 , an output limiter 18 , a rise table 171 , a table updater 172 , and an output command previous value updater 173 . 11 A of control apparatuses control the output of the generator 6. FIG.

The output command value calculator 19 controls the generator 6 by outputting the limit command value P _a based on the original control command value P _max and the rising fixed rate V _c . The output command value calculator 19 receives the original control command value P _max from the output limiter 18 and limits the limit command value _Pa . The output limiter 18 appropriately sets the original control command value P _max according to the state of the wind turbine (the command value for the pitch angle of the blades, etc.).

Output command previous value update unit 173 stores the previous value of limit command value _Pa . In the output command previous value update unit 173, the current value of the limit command value _Pa obtained by the output command value calculation unit 19 is stored as the previous value, and this previous value is used in the next calculation step in the output command value calculation unit 19. used for Note that the previous value is updated for each control cycle.

_For example, when the previous value is 1400 kW, the limit command value Pa is 1500 kW, the original control command value generated by the output limiter 18 is 2000 kW, the maximum output rate is 100 kW/sec, and the control cycle is 50 msec, The limit command value _Pa is determined as follows.

The change rate of the wind turbine output that the control device 11A intends to realize from now on is 2000 kW/sec (=(1500 kW-1400 kW)/50 msec). Since this rate of change is greater than the maximum output rate V ( ₌ 100 kW/sec), instead of adopting this value as it is as the limit command value Pa, the value obtained by multiplying the maximum output rate by the control cycle is used. 1405 kW (=1400 kW+100 kW/ _sec.times.50 msec), which is the sum with the previous value, is adopted as the limit command value Pa.

Here, a maximum output rate having a value corresponding to the difference between the original control command value and the current output value (the current value of active power supplied to the power system) is set. Specifically, in a range in which the absolute value of the difference is equal to or less than a predetermined threshold value, the maximum output rate is set to a value that increases as the absolute value of the difference increases.

The control device 11A sets the maximum output rate according to the difference using an increase table 171, which is a lookup table representing the relationship between the difference and the maximum output rate.

Further, the table updating unit 172 updates the increase table 171 based on the amount of overshoot of the current output value with respect to the upper limit value of the output.

Since the response characteristics of the hardware (generator 6, etc.) that constitutes the wind power generator usually have individual differences, the optimum contents of the rising table 171 differ for each wind turbine. Therefore, the table update unit 172 updates the rise table 171 based on the amount of overshoot of the output of the generator 6 with respect to the output upper limit value, thereby making the rise table 171 suitable for each wind turbine. Further, even if the response characteristics of the hardware change over time, the table update unit 172 updates the response characteristics of the hardware based on the previous value stored in the previous output command value update unit 173. The contents of the ascending table 171 are changed accordingly. That is, the control device 11A determines the command value based on the ratio stored in the table 171 for elevation.
Note that the control device 11A is not limited to the rising table 171 for dealing with the amount of overshoot, and may be provided with a lookup table for the amount of undershoot.

In the control device 11A of the comparative example, the subtractor 16 obtains the difference X by _subtracting the output _Pw from the original control command value PL. This difference X is input to the rise table 171 , and _Vc corresponding to the difference X is output to the output command value calculator 19 .

FIG. 11 is a graph showing the original control command value, the control command value, and the power generation output of the comparative example. The horizontal axis of the graph indicates time, and the vertical axis indicates the output of the generator 6, the original control command value, and the control command value.
Before time _T0 , the original control command value is _Pmin . The original control command value becomes P _min +10 from time T ₀ to T ₂ , and becomes P _min again after time T ₂ .
Since the control device 11A of the comparative example calculates the limit command value _Pa at the ratio determined by each generator 6, it cannot detect the case where the output pulsation amount of the generator 6 becomes larger than normal, Overshoot may occur. On the other hand, in this embodiment, the command value is adjusted according to the dispersion value of the operating state of each generator 6 . As a result, it is possible to detect the case where the amount of output pulsation of the generator 6 is larger than normal, and suppress overshoot.

(Modification)
The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. A part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

Some or all of the above configurations, functions, processing units, processing means, etc. may be realized by hardware such as integrated circuits. Each of the above configurations, functions, etc. may be realized by software by a processor interpreting and executing a program for realizing each function. Information such as programs, tables, and files that implement each function can be stored in recording devices such as memory, hard disks, SSDs (Solid State Drives), or recording media such as flash memory cards and DVDs (Digital Versatile Disks). can.

In each embodiment, control lines and information lines indicate those considered necessary for explanation, and not all control lines and information lines are necessarily indicated on the product. In fact, it may be considered that almost all configurations are interconnected.

Modifications of the present invention include, for example, the following (a) to (c).
(a) The present invention is not limited to wind energy, and may be applied to power generation using renewable energy such as solar energy and tidal energy, and is not limited.
(b) The present invention is not limited to control based on the variance of a plurality of renewable energy generators, but may be controlled by the variance of the state of a single renewable energy generator at each time. For example, in a wind power generation facility that generates power with a single windmill, the pulsation of the generated power may be recorded for each predetermined period, and the output upper limit of the generator may be adjusted based on the pulsation dispersion value.
(c) The method of controlling by the variance value of the operating state of the renewable energy power generator is not limited to the above embodiment. For example, a control command value (output upper limit value) obtained by subtracting a predetermined value from the original control command value according to the dispersion value of the operating state of the renewable energy generator may be commanded to the generator, and is not limited.

1 wind power generation system 20a, 20b, . 14 Original limit command value output unit 15 Limit command calculation unit 151 Comparison unit 152 Variance calculation unit 153 Margin calculation unit 154, 155 Multiplier 156 Subtractor 157 Switch 158 Adjustment unit 159 Subtractor 16 Subtractor 171 Up table 172 Table update Unit 173 Output command previous value update unit 18 Output limiter 19 Output command value calculation unit

Claims (10)

a plurality of generators that generate power using renewable energy;
A control device for controlling the output of the generator,
The control device is
a variance calculation unit that calculates a variance value of the operating state of each generator;
an adjustment unit that adjusts the limit command value to be output to each generator according to each variance value;
A renewable energy power generation system with The variance calculation unit calculates each variance value based on a difference between a target output value and an output value of each generator.
The renewable energy power generation system according to claim 1, characterized by: The variance calculation unit calculates a variance value based on the rotation speed of each generator.
The renewable energy power generation system according to claim 1, characterized by: each generator is a wind power generator that generates electricity by wind power,
The variance calculation unit calculates a variance value based on the wind speed and/or wind direction of each generator.
The renewable energy power generation system according to claim 1, characterized by: each generator is a wind power generator that generates electricity by wind power,
The variance calculation unit calculates a variance value of any one of yaw error, pitch angle, and wind turbulence intensity.
The renewable energy power generation system according to claim 1, characterized by: When the output value of each generator exceeds the original limit command value, the adjustment unit outputs the original limit command value as it is as the limit command value of each generator,
If the output value of each generator is equal to or less than the original limit command value, adjusting the original limit command value according to the variance value;
The renewable energy power generation system according to any one of claims 2 to 5, characterized in that: The adjustment unit
If the variance value is less than the first variance value, output the original limit command value as it is as the limit command value for each generator;
The renewable energy power generation system according to any one of claims 2 to 6, characterized in that: The adjustment unit
outputting the output value of each generator as a limit command value if the variance value is greater than or equal to a second variance value;
The renewable energy power generation system according to claim 7, characterized by: The adjustment unit
If the variance value is greater than or equal to the first variance value and less than the second variance value, a value obtained by proportionally dividing the output value of each generator and the original limit command value by the variance value is output as the limit command value of
The renewable energy power generation system according to claim 8, characterized by: A control device for controlling the output of a plurality of generators that generate power using renewable energy, calculating a variance value of the operating state of each of the generators;
adjusting a limit command value to be output to each generator according to each variance value;
A control method for a renewable energy power generation system that performs

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