JP2018092382A - Photovoltaic power generation system - Google Patents

Abstract

A photovoltaic power generation system that contributes to stabilization of an electric power system by reducing fluctuations in the system frequency when the amount of solar radiation suddenly increases is provided. SOLUTION: Chopper units 30a, 30b are provided with operating point control means 6a, 6b for maximizing output power of solar cell groups 2a, 2b and a through mode operation function, and an inverter 40 is a total of solar cell groups 2a, 2b. In the photovoltaic power generation system provided with the operating point control means 8 for maximizing the output power, the rate of change limiting means 21a and 21b for limiting the rate of change in the increasing direction of the input power of the chopper unit and the operation of the operating point control means 8 Sometimes, the rate-of-change limiting means 22 for limiting the rate of change in the increasing direction of the input power of the inverter 40 and the rate of change of the increasing direction of the input power of the inverter 40 when the rate-of-change limiting means 21a, 21b is not operating If it exceeds, the power rapid increase suppression means 23 which suppresses the increase in input power is provided. [Selection] Figure 1

Description

  The present invention relates to a photovoltaic power generation system that converts direct current power output from a solar cell group into predetermined alternating current power by a chopper unit and an inverter and links the direct current power to a power system.

As a prior art of this type of photovoltaic power generation system, one described in Patent Document 1 is known.
FIG. 5 is a block diagram showing a schematic configuration of this prior art, and the solar power generation system includes solar cell groups 2a and 2b, chopper units 3a and 3b, an inverter 4, and a capacitor 5. The chopper units 3a and 3b are provided with first operating point control means 6a and 6b, respectively, and the inverter 4 is provided with second operating point control means 8.

Chopper unit 3a, 3b, respectively boosts solar cell groups 2a, the DC output voltage of 2b as an input voltage _{V in,} and output.
The inverter 4 performs voltage adjustment and synchronous adjustment in order to perform an interconnection operation with a power system (not shown), converts the DC voltage output from the chopper units 3a and 3b to an AC voltage, and outputs the AC voltage. The AC voltage output from the inverter 4 is transformed into a system voltage at each site by a transformer (not shown).
The inverter 4, as the input voltage E is constant or predetermined voltage range, has a function of controlling the AC output current I _o.

Chopper unit 3a, the first operating point control means 6a in 3b, 6b by controlling the input current _{I in,} optimized solar cell groups 2a, the operating point of 2b, respectively solar cell groups 2a, 2b to Maximum power tracking (MPPT) control is performed so as to obtain the maximum output.

Further, the chopper unit 3a, 3b, when the input voltage V _in exceeds a predetermined input voltage of the inverter 4, the switching operation is stopped function of outputting directly the input voltage V _in as the voltage E (through mode operation Function). This through mode operation function plays a role of preventing the occurrence of switching loss in the chopper units 3a and 3b, and this function enables high efficiency of the photovoltaic power generation system.

FIG. 6 is a schematic configuration diagram showing a main circuit (same for both units) of the chopper units 3a and 3b.
That is, the main circuit of the chopper units 3a and 3b includes a semiconductor switching element (MOSFET) 31 and an inductor 32 connected in series between the DC input terminals P ₁ and N ₁ , a freewheeling diode 33, and a switching diode 34. And a chopper 36 including a capacitor 35 and a short-circuit means 7. P ₂ and N ₂ are direct current output terminals.

The short-circuit means 7 is composed of either a low-frequency rectifier diode, a mechanical contact switch, a synchronous rectifier circuit using a semiconductor switching element, or a combination thereof. The short-circuiting means 7, during the through mode operation described above, the chopper unit 3a, and short circuit between input and output terminals _P 1, _{P 2} of 3b, and outputs the input voltage _{V in} as it voltage E.

  The second operating point control means 8 in the inverter 4 has a function of optimizing the operating points of the solar cell groups 2a and 2b by changing the input voltage E, so that all the chopper units 3a and 3b are through. When the mode operation is started, maximum power follow-up control is performed to change the operating point so that the total output power of the solar cell groups 2a and 2b is maximized.

In the conventional technology configured as described above, even when the output voltage of the solar cell groups 2a and 2b is small, the input voltage E of the inverter 4 is increased by boosting the input voltage by the chopper units 3a and 3b. Can do. Therefore, the AC output voltage of the inverter 4 can be set high, the output current _Io of the inverter 4 can be reduced with respect to the same output power, the conduction loss in the inverter 4 can be reduced, and the device can be downsized. is there.

  Further, since the MPPT control is performed by the chopper units 3a and 3b provided corresponding to the solar cell groups 2a and 2b, respectively, the output power of the solar cell groups 2a and 2b can be maximized. Compared to the case where MPPT control is performed collectively for 2a and 2b, there is an advantage that the output power of the entire photovoltaic power generation system can be increased.

Next, an example of the operation of this solar power generation system will be described.
For example, as a result of one of the chopper unit 3a has performed MPPT control, when the output voltage V _in of the solar cell group 2a exceeds a predetermined input voltage of the inverter 4, switching loss by stopping switching operation of the chopper unit 3a together with reducing, and outputs the output terminal P _1, P ₂ between shorting the input voltage V _in of the chopper unit 3a by short-circuiting it means 7 as it is as the voltage E (through mode operation).

At this time, as a result of the other chopper unit 3b has performed MPPT control, the output voltage V _in of the solar cell group 2b is less than the predetermined input voltage of the inverter 4, the chopper unit 3b is boosting operation performed switching.
As described above, according to the conventional technology, the output power of the solar cell groups 2a and 2b can be increased and the loss can be reduced to increase the output power of the photovoltaic power generation system.

Japanese Patent No. 5880778 (paragraphs [0021] to [0031], FIG. 1 etc.)

By the way, the direct-current power obtained from a solar cell group fluctuates with changes in solar radiation and temperature.
In the photovoltaic power generation system shown in FIG. 5, when the amount of solar radiation increases rapidly, the output power increases rapidly by the chopper units 3 a and 3 b performing MPPT control. Inverter 4, as the input voltage E is constant, or by controlling the AC output current I _o to a predetermined voltage range, the output effective power of the inverter 4 is rapidly increased as a result.

However, in a weak power system such as a remote island, when the output active power of the inverter 4 rapidly increases, the frequency of the system fluctuates.
Therefore, the conventional solar power generation system has the above-described advantages, but particularly in a weak power system such as a remote island, when the amount of solar radiation increases rapidly, the frequency of the system fluctuates and the load is adversely affected. was there.

  Therefore, a problem to be solved by the present invention is to provide a photovoltaic power generation system that can reduce fluctuations in the system frequency when the amount of solar radiation increases rapidly and contribute to stabilization of the power system.

In order to solve the above-mentioned problem, the invention according to claim 1 is installed corresponding to each of a plurality of solar cell groups, and the DC output voltage of the solar cell group has a predetermined magnitude by the operation of the semiconductor switching element. Multiple chopper units that convert to DC voltage;
An inverter that is connected in common to the output side of the plurality of chopper units, and that converts the DC voltage into an AC voltage by the operation of the semiconductor switching element and performs an interconnection operation with the power system;
A first operating point for maximizing the output power of the solar cell group by controlling the output current of the chopper unit and optimizing the operating point of the solar cell group connected to the chopper unit. Control means;
When the output voltage of the solar cell group exceeds a predetermined input voltage of the inverter, the switching operation of the chopper unit is stopped and a through mode operation is performed in which the output voltage of the solar cell group is directly output to the inverter. Function and
By optimizing the operating point of all the solar cell groups by controlling the input voltage of the inverter when all the chopper units perform through mode operation, the total output power of all the solar cell groups is maximized. Second operating point control means for
In the solar power generation system with
First rate-of-change limiting means for limiting a rate of change in the increasing direction of input power of the chopper unit in which the first operating point control means is operating;
Second rate-of-change limiting means for limiting the rate of change in the increasing direction of the input power of the inverter during operation of the second operating point control unit;
A power rapid increase suppression means for suppressing an increase in input power of the inverter when the rate of change in the increase direction of the input power of the inverter exceeds a predetermined rate of change when the second change rate limiting means is not operated; It is characterized by that.

The invention according to claim 2 is the solar power generation system according to claim 1,
The first change rate limiting means includes:
Means for generating a chopper input power command based on the chopper input voltage and the chopper input voltage command obtained by the first operating point control means, and the chopper input power command so as not to exceed a predetermined increasing direction change rate. Means for generating a chopper input current command, and means for generating an on / off command for the switching element of the chopper unit so that a deviation between the chopper input current command and the chopper input current becomes zero. And

The invention according to claim 3 is the solar power generation system according to claim 1 or 2,
The second change rate limiting means includes:
Means for generating a first active current command so that a deviation between the inverter input voltage and the inverter input voltage command obtained by the second operating point control means becomes zero; and an increasing direction of the first active current command A means for generating a second active current command by limiting the rate of change to a predetermined value, an inverter output voltage command is generated using the second active current command, reactive current command and inverter output current, and the inverter output Means for generating an on / off command for the switching element of the inverter based on a voltage command.

The invention according to claim 4 is the solar power generation system according to any one of claims 1 to 3,
The power surge suppression means is
When the input power of the inverter exceeds a predetermined sudden increase detection level, the previous calculation value of the active current command of the inverter is set to the upper limit value, and the active current command upper limit change addition value is sequentially added to the previous calculation value A means for generating an active current command using the determined value as a new upper limit value, an inverter output voltage command using the effective current command, the reactive current command, and the inverter output current, and the inverter based on the inverter output voltage command Means for generating an on / off command for the switching element.

  According to a fifth aspect of the present invention, in the photovoltaic power generation system according to any one of the first to fourth aspects, the first operating point control means and the first change rate limiting means are included in the chopper unit. And the second operating point control means, the second change rate limiting means, and the power rapid increase suppression means are provided in the inverter.

  According to the present invention, while increasing the output power of the solar cell group and reducing the loss, even when the amount of solar radiation increases rapidly, the rapid increase of the effective power output from the inverter is suppressed, and the system frequency fluctuations and the adverse effect on the load are suppressed. Can be suppressed. Thereby, it is possible to realize a high-efficiency and high-performance solar power generation system.

It is a block diagram which shows the schematic structure of embodiment of this invention. It is a control block diagram for demonstrating operation | movement of the chopper electric power increase direction change rate limiting means in FIG. It is a control block diagram for demonstrating operation | movement of the inverter electric power increase direction change rate limiting means in FIG. It is a control block diagram for demonstrating operation | movement of the inverter electric power rapid increase suppression means in FIG. It is a block diagram which shows the schematic structure of the prior art described in patent document 1. FIG. It is a schematic block diagram which shows the main circuit of the chopper unit in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of this embodiment. 1, parts having the same functions as those shown in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted. Hereinafter, parts different from FIG. 5 will be mainly described.

The embodiment shown in FIG. 1 differs from FIG. 5 in that the chopper units 30a and 30b include chopper power increase direction change rate limiting means 21a and 21b in addition to the first operating point control means 6a and 6b, respectively. The inverter 40 includes an inverter power increase direction change rate limiting means 22 and an inverter power rapid increase suppression means 23 in addition to the second operating point control means 8.
The chopper units 30a and 30b have the same configuration, and the main circuit includes the chopper 36 and the short-circuit means 7 as in FIG.

First, the chopper power increase direction change rate limiting means 21a and 21b operate when the chopper units 30a and 30b perform MPPT control, respectively.
The inverter power increase direction change rate limiting means 22 operates when all the chopper units 30a and 30b operate in the through mode and the inverter 40 performs the MPPT control. Furthermore, the inverter power rapid increase suppression means 23 operates when the inverter 40 does not perform MPPT control, that is, when a chopper unit that performs MPPT control exists in part.

  Next, the configuration and operation of the chopper power increase direction change rate limiting means 21a and 21b will be described with reference to FIG. Since the configurations of the limiting units 21a and 21b are the same, here, the chopper power increase direction change rate limiting unit 21a in the chopper unit 30a will be described as an example.

When the chopper unit 30a performs the MPPT control, as shown in FIG. 2, the chopper input current I _in and the chopper input voltage V _in are multiplied by the multiplication means 301 to obtain the input power P _in , and this input power P _in In response to this, the operating point control means 6a performs MPPT control to obtain an input voltage command V _in ^* . A deviation between the input voltage command V _in ^* and the chopper input voltage V _in is obtained by the subtracting means 302, and the input current command (before the power change rate is limited) I _in ^** by the voltage regulator 303 so that the deviation becomes zero. Is input to the chopper power increasing direction change rate limiting means 21a.

In the chopper power increase direction change rate limiting means 21a, the multiplication means 211 multiplies the input current command (before power change rate restriction) I _in ^** by the chopper input voltage V _in to input power command (before power change rate restriction). ^Find P _in ^** . With respect to this input power command (before power change rate restriction) P _in ^** , an input power command P _in ^* after power change rate restriction is obtained via the increasing direction change rate limiter 212, and the chopper input voltage V by multiplying the _in reciprocal of (1 _{/ V in)} obtaining the input current command _{I in} ^* after power change rate limit.
Here, the command holding means 213 holds the previous calculated value of the input power command P _in ^* , and the increase direction change rate limiter 212 increases the current calculated value with respect to the previous calculated value of the input power command P _in ^*. It operates so that the rate of change does not exceed a predetermined value.

Next, a deviation between the input current command I _in ^* output from the multiplication means 214 and the chopper input current I _in is obtained by the subtraction means 215, and the voltage to the switching control means 304 is obtained by the current regulator 216 so that this deviation becomes zero. Generate directives. The switching control unit 304 outputs an on / off command to the switching element 31 (see FIG. 6) of the chopper 36 based on the voltage command, and controls the operation of the chopper 36.

With the above operation, the rate of change of the solar cell group 2a in which the chopper unit 30a performs MPPT control can be limited when the amount of solar radiation increases rapidly and the output power increases.
In addition, when the amount of solar radiation suddenly decreases and the output power of the solar cell group 2a sharply decreases, the rate of change cannot be limited to the specified range, so the rate of change in the direction of decrease in output power is not limited. To do.
The operation described above is the same for the chopper power increase direction change rate limiting means 21b in the other chopper unit 30b.

Next, the operation of the inverter power increase direction change rate limiting means 22 in the inverter 40 will be described with reference to FIG.
When all chopper units 30a and 30b operate in the through mode and the inverter 40 performs MPPT control, as shown in FIG. 3, the input current of the inverter 40 (the total value of the output currents of the solar cell groups 2a and 2b) and I _d and the input voltage E is multiplied by the multiplication means 401 obtains input power _{P inINV,} operating point control unit 8 in response to the input power _{P InINV} is performed MPPT control prompts the voltage command ^{E *.}

Next, the deviation between the input voltage command E ^* and the inverter input voltage E is obtained by the subtracting means 402, and the effective current command (before the rate of change limitation) I _P ^** is obtained by the voltage regulator 403 so that the deviation becomes zero. Obtained and input to the inverter power increase direction change rate limiting means 22.
For this active current command (before the change ratio limitation) I _P ^**, through the increasing direction change rate limiter 221 obtains the active current command I _P ^* after the change rate limit, the current regulating the active current command I _P ^* Input to the device 223. Here, the command holding means 222 holds the previous calculated value of the active current command I _P ^* , and the increase direction change rate limiter 221 increases the current calculated value with respect to the previous calculated value of the active current command I _P ^*. It operates so that the rate of change does not exceed a predetermined value.

The current regulator 223 generates a voltage command so that each deviation between the active current command I _P ^* , the reactive current command I _Q ^*, and the active current component and the reactive current component in the inverter output current I _o becomes zero. And output to the adding means 407. Incidentally, PLL circuit 405 is for generating a phase reference signal from the inverter output voltage _{V o.}

The addition means 407, compensation signal is also inputted obtained by entering the inverter output voltage V _o to the counter voltage compensation means 406. Here, the counter voltage compensation means 406, in order to output the same voltage as the electric power system to interconnection inverter 40, the inverter output voltage V _o, a band pass filter operation and detection delay for the purpose of ripple removal The compensation signal is generated by performing a phase lead correction to be corrected and performing an operation for soft-starting the output voltage.
The switching control unit 404 generates an on / off command for the switching element of the inverter 40 based on the voltage command after counter voltage compensation, and controls the operation of the inverter 40.

With the above operation, when all the chopper units 30a and 30b operate in the through mode and the inverter 40 performs the MPPT control, the output current from the solar cell groups 2a and 2b is controlled by controlling the effective current output from the inverter 40. The rate of change in the increasing direction can be limited.
In addition, when the amount of solar radiation decreases rapidly and the output power of the solar cell groups 2a and 2b rapidly decreases, the rate of change cannot be limited to a specified range, and therefore the rate of change in the direction of decrease in output power is not limited. I will do it.

Next, the operation of the inverter power rapid increase suppression means 23 will be described with reference to FIG.
When a chopper unit that performs MPPT control and a chopper unit that operates in the through mode coexist, the output power of the solar cell group connected to the chopper unit cannot be controlled by the chopper unit that operates in the through mode. In other words, when the operating point control means 8 in the inverter 40 does not operate and thereby the inverter power increase direction change rate limiting means 22 does not operate, the output power of the solar cell group cannot be controlled.
Therefore, the inverter power rapid increase suppression means 23 is for suppressing a rapid increase in the output power of the solar cell group when the amount of solar radiation increases rapidly in such a case.

In FIG. 4, the inverter input voltage E and the inverter input current I _d are multiplied by the multiplication means 231 to obtain the inverter input power P _inINV , and this inverter input power P _inINV is input to the inverter input power rapid increase determination means 232. The inverter input power rapid increase determination means 232 turns on and outputs the “inverter input power rapid increase flag” when the change rate of _PinINV exceeds the “inverter input power rapid increase detection level”.

When the “inverter input power rapid increase flag” is turned on, the switching means 233 is connected to the “T” side. Then, a previously calculated value (output of the command holding unit 241) of an effective current command I _P ^* , which will be described later, is given as an upper limit value of the upper limiter 240 from the switching unit 233 via the adding unit 235 and the upper limiter 236. Further, the switching means 234 is connected to the “T” side for each “effective current command upper limit addition timing” and “effective current command upper limit change addition value” is input to the adding means 235, and as a result, the upper limit value of the upper limit limiter 240. Is gradually increased. Thereby, the change in the increasing direction of the active current command I _P ^* can be limited to the set change rate or less, and a sudden increase in the input power (output effective power) of the inverter 40 can be prevented.

The inverter power rapid increase suppression means 23 obtains a deviation between the inverter input voltage command E ^* and the inverter input voltage E by the subtraction means 238, and calculates an effective current command by the voltage regulator 239 so that the deviation becomes zero. The upper limit value of the effective current command is limited by the above-described upper limiter 240 and is output as the effective current command _IP ^* .

In the current regulator 242, as in the current regulator 223 of FIG. 3, each of the active current command I _P ^* , the reactive current command I _Q ^*, and the active current component and the reactive current component in the inverter output current I _o . A voltage command is generated according to the deviation and output to the adding means 407. The function of the current regulator 242 in FIG. 4 may be shared by the current regulator 223 shown in FIG.

The adder 407 adds the compensation signal from the counter voltage compensator 406 to the voltage command and outputs it to the switching controller 404. The switching control unit 404 outputs an on / off command for the switching element of the inverter 40 based on the voltage command output from the adding unit 407 and controls the operation of the inverter 40.
By the above-described operation, even when a chopper unit that performs MPPT control and a chopper unit that operates in the through mode coexist, the operation of the inverter power rapid increase suppression unit 23 suppresses a rapid increase in the output power of the solar cell group when the solar radiation amount suddenly increases. be able to.

  As described above, according to this embodiment, the chopper power increase direction change rate limiting means 21a, 21b in the chopper units 30a, 30b, the inverter power increase direction change rate limiting means 22 in the inverter 40, and the inverter power rapid increase suppression. By providing the means 23, in the power converter performing MPPT control, the rate of change in the increasing direction of the output power of the solar cell group is limited, and the chopper unit performing MPPT control and the chopper unit operating in the through mode are mixed. In this case, the rapid increase of the output active power of the inverter 40 can be suppressed and the fluctuation of the system frequency can be prevented.

The present invention is not limited to the embodiment described above.
For example, the number of solar cell groups, chopper units, and inverters can be appropriately changed according to the power specifications of the solar power generation system. In addition, in the embodiment, it is assumed that the chopper unit is configured by one short-circuit means and one chopper for one solar cell group, but according to the power specifications of the photovoltaic power generation system, For one solar cell group, a single short-circuit means and a plurality of choppers connected in parallel may be used.

  Further, as for the configurations of the chopper and the inverter, various types of systems conventionally provided can be appropriately employed according to the power specifications of the photovoltaic power generation system. Further, as a semiconductor switching element constituting a chopper or an inverter, high frequency switching is performed using a power semiconductor element using a wide band gap semiconductor such as SiC (silicon carbide), a gallium nitride material, a gallium oxide material, or diamond. Thus, the power converter may be reduced in size and loss.

2a, 2b: Solar cell group 5: Capacitors 6a, 6b: First operating point control means 8: Second operating point control means 21a, 21b: Chopper power increase direction change rate limiting means 22: Inverter power increase direction change rate Limiting means 23: Inverter power rapid increase suppression means 30a, 30b: Chopper unit 40: Inverters 211, 214, 231: Multiplication means 212: Increase direction change rate limiters 213, 222, 237, 241: Command holding means 215, 238: Subtraction means 216, 223, 242: current regulator 221: increasing direction change rate limiter 232: inverter input power rapid increase determination means 233, 234: switching means 235: addition means 236, 240: upper limiter 239: voltage regulator 301: multiplication means 302 : Subtraction means 303: Voltage regulator 304: Switching control means 401 Multiplication means 402: the subtraction means 403: voltage regulator 404: switching control unit 405: PLL circuit 406: counter voltage compensation means 407: addition means

Claims (5)

A plurality of chopper units that are respectively installed corresponding to a plurality of solar cell groups, and that convert a DC output voltage of the solar cell groups into a DC voltage of a predetermined magnitude by operation of a semiconductor switching element;
An inverter that is connected in common to the output side of the plurality of chopper units, and that converts the DC voltage into an AC voltage by the operation of the semiconductor switching element and performs an interconnection operation with the power system;
A first operating point for maximizing the output power of the solar cell group by controlling the output current of the chopper unit and optimizing the operating point of the solar cell group connected to the chopper unit. Control means;
When the output voltage of the solar cell group exceeds a predetermined input voltage of the inverter, the switching operation of the chopper unit is stopped and a through mode operation is performed in which the output voltage of the solar cell group is directly output to the inverter. Function and
By optimizing the operating point of all the solar cell groups by controlling the input voltage of the inverter when all the chopper units perform through mode operation, the total output power of all the solar cell groups is maximized. Second operating point control means for
In the solar power generation system with
First rate-of-change limiting means for limiting a rate of change in the increasing direction of input power of the chopper unit in which the first operating point control means is operating;
Second rate-of-change limiting means for limiting the rate of change in the increasing direction of the input power of the inverter during operation of the second operating point control unit;
When the second rate-of-change limiting unit does not operate, a power rapid increase suppression unit that suppresses an increase in the input power of the inverter when the rate of change in the direction of increase of the input power of the inverter exceeds a predetermined rate of change;
A photovoltaic power generation system characterized by comprising: In the solar power generation system according to claim 1,
The first change rate limiting means includes:
Means for generating a chopper input power command based on a chopper input voltage and a chopper input voltage command obtained by the first operating point control means;
Means for generating a chopper input current command so that the chopper input power command does not exceed a predetermined increasing direction change rate;
And a means for generating an on / off command for the switching element of the chopper unit so that a deviation between the chopper input current command and the chopper input current becomes zero. In the solar power generation system according to claim 1 or 2,
The second change rate limiting means includes:
Means for generating a first active current command so that a deviation between the inverter input voltage and the inverter input voltage command obtained by the second operating point control means becomes zero;
Means for generating a second active current command by limiting an increasing direction change rate of the first active current command to a predetermined value;
Means for generating an inverter output voltage command using the second active current command and reactive current command and the inverter output current, and generating an on / off command for the switching element of the inverter based on the inverter output voltage command;
A photovoltaic power generation system characterized by comprising: In the solar energy power generation system given in any 1 paragraph of Claims 1-3,
The power surge suppression means is
When the input power of the inverter exceeds a predetermined sudden increase detection level, the previous calculation value of the active current command of the inverter is set to the upper limit value, and the active current command upper limit change addition value is sequentially added to the previous calculation value Means for generating an active current command using the determined value as a new upper limit value;
Means for generating an inverter output voltage command using the active current command and the reactive current command and the inverter output current, and generating an on / off command for the switching element of the inverter based on the inverter output voltage command;
A photovoltaic power generation system characterized by comprising: In the solar energy power generation system given in any 1 paragraph of Claims 1-4,
The first operating point control means and the first change rate limiting means are provided in the chopper unit, and the second operating point control means, the second change rate limiting means, and the power rapid increase suppression means are provided. A solar power generation system provided in the inverter.

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