JP7189652B2 - Solar power system - Google Patents

Description

Embodiments of the present invention relate to photovoltaic systems.

In order to maintain a balance between demand and supply of electric power in the electric power system, it may be required to control the electric power output to the electric power system even in the photovoltaic power plant. For example, it is proposed to contribute to the stabilization of the power system by controlling the interconnection point power in response to an emergency request containing information on the time to change the output upper limit value and the output upper limit value after the change ( For example, Patent Document 1).

A photovoltaic power plant may be provided with a plurality of photovoltaic power generation devices and a plurality of power converters (power conditioners) corresponding to the plurality of photovoltaic power generation devices. At this time, the specifications of the plurality of power converters, such as models and manufacturers, may differ among the plurality of power converters. In this case, it is difficult to collectively perform output control of a plurality of power converters because of differences in command value input methods and communication standards. For this reason, it is possible that the configuration of the solar power plant will become complicated, such as the need to perform output control separately for each power conversion device with different specifications, and the cost of performing output control will increase. be.

Therefore, in a photovoltaic power generation system, it is desired to be able to perform output control with a simple configuration even when the specifications of a plurality of power converters are different.

WO2016/09820

Embodiments provide a photovoltaic power generation system that can perform output control with a simple configuration even when specifications of a plurality of power converters are different.

A photovoltaic power generation system according to an embodiment includes a first photovoltaic power generation device and a first power conversion device, is connected to a power system via an interconnection point, and is output from the first photovoltaic power generation device A first power conversion unit that converts DC power into AC power by the first power conversion device and outputs it to the power system, a second solar power generation device, and a second power conversion that has different specifications from the first power conversion device. and a device connected to the power system through the interconnection point, and converting DC power output from the second solar power generation device into AC power by the second power conversion device to generate the power Based on a second power conversion unit that outputs to a grid, a measuring device that measures the power at the interconnection point, and an overall target value that is output from the first power conversion unit and the second power conversion unit to the power system , a monitoring device that determines start or stop of the second power conversion unit and determines the shared power of the first power conversion unit, and can perform output control of the first power conversion device, An output control device that cannot control the output of a different second power conversion device, wherein the overall target value and the shared power are obtained from the monitoring device, and the measured value of the power at the interconnection point is obtained from the and an output control device that controls the output of the first power converter so that the power at the interconnection point approaches the overall target value.

This embodiment provides a photovoltaic power generation system that can perform output control with a simple configuration even when the specifications of a plurality of power converters are different.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which represents typically the solar power generation system which concerns on embodiment. 2(a) to 2(d) are explanatory diagrams schematically showing an example of the operation of the monitoring device. FIGS. 3A to 3C are explanatory diagrams schematically showing an example of the operation of the output control device. FIGS. 4A and 4B are explanatory diagrams schematically showing an example of the operation of the output control device. FIGS. 5(a) and 5(b) are explanatory diagrams schematically showing modifications of the operation of the monitoring device and the output control device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the drawings are schematic or conceptual, and the relationship between the thickness and width of each portion, the size ratio between portions, and the like are not necessarily the same as the actual ones. Also, even when the same parts are shown, the dimensions and ratios may be different depending on the drawing.
In addition, in the present specification and each figure, the same reference numerals are given to the same elements as those described above with respect to the previous figures, and detailed description thereof will be omitted as appropriate.

FIG. 1 is a block diagram schematically showing a photovoltaic power generation system according to an embodiment.
As shown in FIG. 1 , the solar power generation system 10 includes a first power converter 11 , a second power converter 12 , a measuring device 14 , a monitoring device 16 and an output control device 18 .

The first power conversion unit 11 has a first photovoltaic power generation device 21 and a first power conversion device 31 . The first power conversion unit 11 is connected to the power system 2 via a connection point LP, converts the DC power output from the first photovoltaic power generation device 21 into AC power by the first power conversion device 31, and converts it into AC power. Output to 2.

The second power conversion unit 12 has a second photovoltaic power generation device 22 and a second power conversion device 32 . The second power conversion unit 12 is connected to the power system 2 via a connection point LP, converts the DC power output from the second photovoltaic power generation device 22 into AC power by the second power conversion device 32, and converts it into AC power. Output to 2.

The first photovoltaic power generation device 21 and the second photovoltaic power generation device 22 generate DC power by converting solar light energy into electrical energy. The first photovoltaic power generation device 21 and the second photovoltaic power generation device 22 are a plurality of solar cell strings in which a plurality of solar cell modules each configured by arranging a large number of cells (solar cell elements) are arranged in series. The first photovoltaic power generation device 21 and the second photovoltaic power generation device 22 are not limited to solar cell strings, and may be, for example, single solar cell modules connected in parallel.

The configuration of the second photovoltaic power generation device 22 may be the same as or different from that of the first photovoltaic power generation device 21 . For example, the rated output of the second photovoltaic power generation device 22 may be the same as or different from the rated output of the first photovoltaic power generation device 21 .

The first power conversion device 31 is connected to the first photovoltaic power generation device 21 and is also connected to the power system 2 via an interconnection point LP. The first power conversion device 31 is connected to an interconnection point LP via, for example, a circuit breaker 40 and transformers 42 and 50 . The first power conversion device 31 converts the DC power output from the first photovoltaic power generation device 21 into AC power and outputs the AC power to the power system 2 .

The second power conversion device 32 is connected to the second photovoltaic power generation device 22 and is also connected to the power grid 2 via the interconnection point LP. The second power conversion device 32 is connected to the interconnection point LP via, for example, a circuit breaker 44, transformers 46 and 50, and the like. The second power conversion device 32 converts the DC power output from the second photovoltaic power generation device 22 into AC power and outputs the AC power to the power system 2 .

The AC power of the power system 2 is, for example, three-phase AC power. The first power conversion device 31 and the second power conversion device 32 convert DC power into three-phase AC power corresponding to the power system 2 and output the three-phase AC power to the power system 2 . However, the AC power of the power system 2 may be single-phase AC power or the like. The first power conversion device 31 and the second power conversion device 32 may convert DC power into arbitrary AC power according to the power system 2 .

The specifications of the second power conversion device 32 are different from the specifications of the first power conversion device 31 . Here, "different specifications" means, for example, different models and manufacturers, different command value input methods and different communication standards, etc. Then, it means that the operation of the second power conversion device 32 cannot be controlled.

The first power converter 11 has a plurality of first photovoltaic power generation devices 21 and a plurality of first power converters 31 . In this example, the first power converter 11 has two first photovoltaic power generation devices 21 and two first power converters 31 . The plurality of first power conversion devices 31 are provided corresponding to each of the plurality of first photovoltaic power generation devices 21 .

The second power conversion unit 12 has a plurality of second photovoltaic power generation devices 22 and one second power conversion device 32 . In this example, the second power conversion unit 12 has two second photovoltaic power generation devices 22 and one second power conversion device 32 . The second power conversion device 32 is commonly used for the plurality of second photovoltaic power generation devices 22 .

The number of the first photovoltaic power generation devices 21 and the number of the first power converters 31 provided in the first power converter 11 may be any number. The number of first photovoltaic power generation devices 21 and the number of first power conversion devices 31 may be one. The number of first photovoltaic power generation devices 21 connected to the first power conversion device 31 may be one or plural. In other words, the first power conversion device 31 may be used for one first photovoltaic power generation device 21 or may be commonly used for a plurality of first photovoltaic power generation devices 21 . The number of first photovoltaic power generation devices 21 connected to the first power conversion device 31 may be appropriately set according to the rated output of the first photovoltaic power generation device 21 and the rated output of the first power conversion device 31 . These are the same for the second power converter 12 as well.

The photovoltaic power generation system 10 also includes a plurality of first power converters 11 and a plurality of second power converters 12 . The plurality of first power converters 11 and the plurality of second power converters 12 are installed at different locations, for example. The plurality of first power converters 11 and the plurality of second power converters 12 may be called sites or banks, for example.

However, the number of the first power converters 11 and the number of the second power converters 12 provided in the photovoltaic power generation system 10 may be any number. The number of first power converters 11 may be the same as or different from the number of second power converters 12 .

When a plurality of first power converters 11 are provided, the number of first photovoltaic power generation devices 21 and the number of first power converters 31 may be the same or different for each of the plurality of first power converters 11. may In other words, the rated outputs of the plurality of first power converters 11 may be the same or different. These are the same for the second power converter 12 as well.

The measuring device 14 measures the power at the interconnection point LP. More specifically, the measuring device 14 measures active power at the interconnection point LP.

An overall target value to be output from the first power converter 11 and the second power converter 12 to the power system 2 is set in the monitoring device 16 . The overall target value is, more specifically, the target value of the total power output from the plurality of first power converters 11 and the plurality of second power converters 12 to the power system 2 .

The overall target value is input to the monitoring device 16 via the network, for example, from a host controller or the like. The overall target value may be input to the monitoring device 16 by an operator or the like of the monitoring device 16 by operating the operating unit. The overall target value may be a preset fixed value. Any method that can be set in the monitoring device 16 may be used to set the overall target value.

Based on the set overall target value, the monitoring device 16 determines whether to start or stop the second power converter 12 and determines the shared power of the first power converter 31 .

As shown in this example, when the photovoltaic power generation system 10 includes a plurality of second power converters 12, the monitoring device 16 calculates the start or stop is determined, and the number of the second power converters 12 corresponding to the overall target value is started.

The photovoltaic power generation system 10 further includes a controller 34 . The monitoring device 16 inputs to the control device 34 the result of the decision to start or stop the plurality of second power converters 12 . The control device 34 controls the activation or deactivation of the plurality of second power converters 12 based on the result of determination of activation or deactivation input from the monitoring device 16 .

Note that, in this example, one controller 34 controls the start or stop of each of the plurality of second power converters 12 . Without being limited to this, a plurality of control devices 34 may be provided, and the plurality of control devices 34 may control activation or stopping of the plurality of second power converters 12 . Also, the result of the decision to start or stop may be directly input from the monitoring device 16 to the second power converter 12 without going through the control device 34 . Thus, the controller 34 is provided as required and can be omitted. For example, when the second power conversion unit 12 cannot be directly controlled by the monitoring device 16, the control device 34 can be provided to enable control of starting or stopping of the second power conversion unit 12. FIG.

The output control device 18 is communicably connected to the measuring device 14 and the monitoring device 16 . The output control device 18 acquires the overall target value and the shared power from the monitoring device 16, acquires the measured value of the power of the interconnection point LP from the measuring device 14, and based on the shared power and the measured value, the interconnection point The output of the first power converter 11 is controlled so that the power of the LP approaches the overall target value.

In other words, the first power conversion device 31 is a power conversion device capable of performing output control based on the control of the output control device 18 . In other words, the second power conversion device 32 is a power conversion device that has different specifications from the first power conversion device 31 and cannot perform output control under the control of the output control device 18 .

The plurality of first power conversion devices 31 may be capable of performing output control based on at least the control of the output control device 18. For example, the rated output and the like are determined by each of the plurality of first power conversion devices 31. can be different. Similarly, the plurality of second power conversion devices 32 need not be able to perform output control at least by the control of the output control device 18, for example, the rated output etc. can be different.

The photovoltaic power generation system 10 includes, for example, a plurality of output control devices 18 , and the plurality of output control devices 18 control the output of the plurality of first power converters 11 . One output control device 18 performs output control of a plurality of first power converters 31 provided in one first power converter 11, for example. However, the output control device 18 may be provided in common for the plurality of first power converters 11 . The output control device 18 may perform output control of the plurality of first power converters 11 . The number of output control devices 18 may be one.

As shown in this example, when the photovoltaic power generation system 10 includes a plurality of first power converters 11, the monitoring device 16 determines the shared power of each of the plurality of first power converters 11. . In this case, the shared power is, in other words, individual target values of AC power output from the plurality of first power converters 11 to the power system 2 .

The monitoring device 16 determines the shared power of each of the plurality of first power converters 11 and inputs the determined shared power to each output control device 18 . Each output control device 18 controls each first power converter 11 (each first power converter 31) so that AC power corresponding to the shared power is output from each first power converter 11 to the power system 2. Control output. As a result, the power at the interconnection point LP can be brought closer to the overall target value.

2(a) to 2(d) are explanatory diagrams schematically showing an example of the operation of the monitoring device.
FIGS. 2(a) to 2(d) schematically show an example of how the monitoring device 16 determines whether to start or stop the plurality of second power converters 12. FIG. In this example, the rated output of each of the two first power converters 11 and the two second power converters 12 is assumed to be 10 MW (effective value). In this case, the total AC power output from each first power converter 11 and each second power converter 12 to the power system 2 is 40 MW. Therefore, in this case, the overall target value is set between 0 MW and 40 MW.

As shown in FIG. 2A , when the overall target value is 40 MW, the monitoring device 16 determines to activate the two second power converters 12 and the two first power converters 11 is determined to be 10 MW. This allows the power at the interconnection point LP to approach the overall target value of 40 MW.

As shown in FIG. 2B, when the overall target value is 20 MW or more and less than 40 MW, the monitoring device 16 determines to activate the two second power converters 12 and half of the remaining power is determined as the shared power of the two first power converters 11 . For example, when the overall target value is 30 MW and 20 MW of power is output from each second power converter 11, the remaining power is 10 MW. Therefore, in this case, the monitoring device 16 determines that 5 MW, which is half of the remaining 10 MW, is the shared power of each first power converter 11 . As a result, the power at the interconnection point LP can be brought closer to the overall target value of 20 MW or more and less than 40 MW.

As shown in FIG. 2C, when the overall target value is 10 MW or more and less than 20 MW, the monitoring device 16 determines to activate one of the second power converters 12 and It decides to stop the conversion unit 12 and decides half of the remaining power as the shared power of each first power conversion unit 11 . For example, when the overall target value is 19 MW and 10 MW of power is output from one of the second power converters 12, the remaining power is 9 MW. Therefore, in this case, the monitoring device 16 determines that 4.5 MW, which is half of the remaining 9 MW, is the shared power of each first power converter 11 . As a result, the power at the interconnection point LP can be brought closer to the overall target value of 10 MW or more and less than 20 MW.

As shown in FIG. 2(d), when the overall target value is less than 10 MW, the monitoring device 16 decides to stop the two second power converters 12 and distributes half of the remaining power to each The shared power of the first power converter 11 is determined. For example, if the overall target is 9 MW, the remaining power is 9 MW. Therefore, in this case, the monitoring device 16 determines that 4.5 MW, which is half of the remaining 9 MW, is the shared power of each first power converter 11 . This allows the power at the interconnection point LP to approach the overall target value of less than 10 MW.

In this way, the monitoring device 16 determines to activate or stop the plurality of second power converters 12 so that the overall target value falls within the range of the output control of the plurality of first power converters 11 . The order of the second power converters 12 to be stopped among the plurality of second power converters 12 may be determined in advance. For example, the second power conversion units 12 to be stopped may be sequentially switched among the plurality of second power conversion units 12 so that the operating times of the plurality of second power conversion units 12 are not uneven. When the rated outputs of the plurality of second power converters 12 are different, the second power converters 12 to be stopped may be determined so that the output control of the plurality of first power converters 11 can be easily performed.

In addition, the monitoring device 16 divides the difference obtained by subtracting the output power of the activated second power conversion unit 12 from the overall target value by the number of the plurality of first power conversion units 11, thereby dividing the difference by the number of the first power conversion units. 11 each share power is determined.

As described above, when the number of first power converters 11 is two and the difference is 9 MW, 4.5 MW is determined as the shared power of each of the plurality of first power converters 11 . For example, when the number of the first power converters 11 is three and the difference is 9 MW, 3 MW is determined as the shared power of each of the plurality of first power converters 11 .

3(a) to 3(c), 4(a), and 4(b) are explanatory diagrams schematically showing an example of the operation of the output control device.
FIGS. 3(a) to 3(c), 4(a), and 4(b) schematically show an example of output control of the plurality of first power converters 11 by the output control device 18. FIG. Also in this example, the rated output of each of the two first power converters 11 and the two second power converters 12 is assumed to be 10 MW (effective value).

When the overall target value is 30 MW, the monitoring device 16 decides to activate the two second power conversion units 12 as described above, and half of the remaining 10 MW, ie, 5 MW, is allocated to each first power conversion unit 11. and decide. At this time, it is assumed that the output power of the two second power converters 12 is 9 MW each due to weather conditions and the like.

In this case, as shown in FIG. 3A, the output control device 18 causes the two first power conversion units 11 to share the shortfall of 2 MW, and the output power of the two first power conversion units 11 is controlled to 6 MW. Thereby, the output control of the two first power converters 11 can be performed so that the power at the interconnection point LP approaches the overall target value.

Further, as shown in FIG. 3(b), it is assumed that the output power of one of the first power converters 11 is reduced to 3 MW due to weather conditions and the like.

In this case, the output control device 18 divides the shortfall of 3 MW by 2 (the number of the first power conversion units 11) to obtain 1.5 MW as an adjustment amount, and adds this to the original 6 W to obtain 7.5 MW as two The command value for the output power of the first power converter 11 is used to control the output of the two first power converters 11 .

In this case, as shown in FIG. 3C, the output power of the first power conversion unit 11, which has a margin, rises to 7.5 MW, but the power of the first power conversion unit 11 affected by clouds or the like rises to 7.5 MW. Output power remains at 3 MW.

After the lapse of a predetermined time, the output control device 18 divides the shortfall of 1.5 MW by 2 (the number of the first power conversion units 11) to obtain an adjustment amount of 0.75 MW, which is adjusted to the base 7.5 W. The added 8.25 MW is used as a command value for the output power of the two first power converters 11, and the output of the two first power converters 11 is controlled.

In this case, as shown in FIG. 4A, the output power of the first power conversion unit 11, which has a margin, rises to 8.25 MW, but the power of the first power conversion unit 11 affected by clouds or the like rises to 8.25 MW. Output power remains at 3 MW.

After the lapse of a predetermined time, the output control device 18 divides the shortfall of 0.75 MW by 2 (the number of the first power converters 11) to obtain an adjustment amount of 0.375 MW, which is adjusted to the base 8.25 W. The added 8.625 MW is used as a command value for the output power of the two first power converters 11, and the output of the two first power converters 11 is controlled. As a result, as shown in FIG. 4(b), the output power of the first power converter 11, which has a surplus, rises to 8.625 MW. The output control device 18 repeats the same processing thereafter.

In this way, the output control device 18 divides the difference between the overall target value and the measured value by the number of the plurality of first power converters 11, thereby adjusting the amount of adjustment of the output power of the plurality of first power converters 11. Calculation is performed, and output control of the plurality of first power converters 11 is performed based on the shared power and the adjustment amount. The output control device 18 performs output control of the plurality of first power converters 11 by, for example, calculating an adjustment amount each time a predetermined time elapses and sequentially adding the adjustment amount to the command value.

Thus, by calculating the adjustment amount and controlling the output of the plurality of first power converters 11, the overall target value and the measured value (the plurality of first power converters 11 and the plurality of second power converters 12 To bring the power of the interconnection point LP closer to the overall target value while suppressing the sudden change of the power of the interconnection point LP even when a difference occurs between the total output power of the can be done.

FIGS. 5(a) and 5(b) are explanatory diagrams schematically showing modifications of the operation of the monitoring device and the output control device.
As shown in FIG. 5A, in this example, the rated output of one of the two first power converters 11 is 15 MW, and the rated output of the other is 5 MW. In this way, when the rated outputs of the plurality of first power converters 11 are different, the monitoring device 16 calculates a plurality of coefficients based on the ratio of the rated outputs of the plurality of first power converters 11. have.

In this example, the ratio of the rated outputs of the two first power converters 11 is 3:1. Therefore, according to this ratio, the monitoring device 16 sets the coefficient of the first power conversion unit 11 with a rated output of 15 MW to 0.75, and sets the coefficient of the first power conversion unit 11 with a rated output of 5 MW to 0.25. .

As shown in FIG. 5B , the monitoring device 16 multiplies the difference obtained by subtracting the output power of the second power conversion unit 12 to be activated from the overall target value by a plurality of coefficients to obtain a plurality of first power The power allotted to each of the conversion units 11 is determined.

As shown in FIG. 5B, when the overall target value is 30 MW and the output power of each second power conversion unit 12 is 9 MW, the output power of the second power conversion unit 12 activated from the overall target value is The subtracted difference is 12 MW. In this case, the monitoring device 16 determines 9 MW, which is obtained by multiplying 12 MW by a coefficient of 0.75, as the shared power of the first power conversion unit 11 with a rated output of 15 MW, and determines 3 MW, which is obtained by multiplying 12 MW by a coefficient of 0.25, as 5 MW. It is determined as the shared power of the first power converter 11 with the rated output. Accordingly, even when the rated outputs of the plurality of first power converters 11 are different, it is possible to determine the appropriate shared power according to the difference in the rated outputs.

Further, in this case, the output control device 18 multiplies the difference between the overall target value and the measured value by a plurality of coefficients to calculate the adjustment amount of the output power of the plurality of first power converters 11, and the shared power and the adjustment amount, output control of the plurality of first power converters 11 is performed.

For example, assume that the difference between the overall target value and the measured value is 2 MW as a result of determining the shared power and performing the output control as shown in FIG. 5(b). In this case, the output control device 18 sets the adjustment amount to 1.5 MW, which is obtained by multiplying 2 MW by a coefficient of 0.75, and sets 10.5 MW, which is obtained by adding the adjustment amount of 1.5 MW to the shared power of 9 MW, as the first output of the rated output of 15 MW. Output control is performed as a command value for the output power of the power converter 11 .

Then, the output control device 18 sets 0.5 MW, which is obtained by multiplying 2 MW by a coefficient of 0.25, as an adjustment amount, and adds 3.5 MW, which is obtained by adding the adjustment amount of 0.5 MW to the shared power of 3 MW, as the first electric power of the rated output of 5 MW. Output control is performed as a command value for the output power of the conversion unit 11 .

As a result, even when the rated outputs of the plurality of first power conversion units 11 are different, an appropriate adjustment amount corresponding to the difference in rated output is calculated, and the plurality of first power conversion units 11 are calculated based on the adjustment amount. output control can be performed more appropriately.

Although several embodiments of the invention have been described above, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included within the scope and spirit of the invention, and are included within the scope of the invention described in the claims and equivalents thereof. Moreover, each of the above-described embodiments can be implemented in combination with each other.

2 power system 10 photovoltaic power generation system 11 first power conversion unit 12 second power conversion unit 14 measuring device 16 monitoring device 18 output control device 21 first photovoltaic power generation device 22 second sunlight Power generator 31 First power conversion device 32 Second power conversion device 34 Control device 40 Circuit breaker 42 Transformer 44 Circuit breaker 46 Transformer 50 Transformer

Claims (6)

having a first photovoltaic power generation device and a first power conversion device, connected to an electric power system via an interconnection point, and supplying direct current power output from the first photovoltaic power generation device to the first power conversion device; a first power conversion unit that converts to AC power and outputs it to a power system;
A second solar power generation device and a second power conversion device having specifications different from those of the first power conversion device, connected to the power system via the interconnection point, and the second solar power generation device A second power conversion unit that converts the DC power output from the second power conversion device into AC power and outputs it to the power system;
a measuring device that measures the power of the interconnection point;
Based on the overall target value output to the power system from the first power conversion unit and the second power conversion unit, determining whether to start or stop the second power conversion unit, and sharing the work of the first power conversion unit a monitoring device that determines power;
An output control device that can perform output control of the first power conversion device and cannot perform output control of the second power conversion device with different specifications, wherein the overall target value and the shared power are set to the Acquiring from the monitoring device, acquiring a measured value of the power of the interconnection point from the measuring device, and controlling the output of the first power conversion unit so that the power of the interconnection point approaches the overall target value an output controller that performs
photovoltaic system with comprising a plurality of the second power conversion units,
The monitoring device determines activation or suspension for each of the plurality of second power conversion units based on the overall target value, and activates a number of the second power conversion units corresponding to the overall target value. 1. The solar power generation system according to 1. comprising a plurality of the first power conversion units,
The monitoring device divides the difference obtained by subtracting the output power of the second power conversion unit to be activated from the overall target value by the number of the plurality of first power conversion units, thereby dividing the difference by the number of the first power conversion units. 3. The photovoltaic power generation system according to claim 1 or 2, wherein the allotted power of each is determined. The output control device divides the difference between the overall target value and the measured value by the number of the plurality of first power conversion units to calculate an adjustment amount of the output power of the plurality of first power conversion units. 4. The photovoltaic power generation system according to claim 3, wherein output control of the plurality of first power converters is performed based on the shared power and the adjustment amount. comprising a plurality of the first power conversion units,
The monitoring device has a plurality of coefficients based on the ratio of the rated output of each of the plurality of first power conversion units, and the difference obtained by subtracting the output power of the second power conversion unit to be activated from the overall target value 3. The photovoltaic power generation system according to claim 1 or 2, wherein the shared power of each of the plurality of first power converters is determined by multiplying the plurality of coefficients. The output control device multiplies the difference between the overall target value and the measured value by the plurality of coefficients to calculate an adjustment amount of the output power of the plurality of first power converters, and calculates the shared power and The photovoltaic power generation system according to claim 5, wherein output control of the plurality of first power converters is performed based on the adjustment amount.

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