JP2013242656A - Photovoltaic power generation system, and operation point correcting device and method used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable accurate MPPT system power adjustment, even if a plurality of peaks indicating the maximum power exists due to partial shadows on a solar battery.SOLUTION: An operation point correcting device 2 is provided between a solar battery 1, and a power adjusting device 3 making a solar battery current follow an optimal solar battery current when the output of the solar battery 1 is at the maximum power point, or making solar battery voltage follow optical solar battery voltage, and carrying out following control so as to operate at the obtained maximum power operation point. The operation pont correcting device 2 scans the maximum output of the solar battery, detects the maximum peak when a plurality of peaks exists, and corrects power according to the detected maximum peak to input that to the power adjusting device 3.

Description

The present invention relates to a photovoltaic power generation system.
In particular, the present invention relates to a technique for correcting an operating point of a maximum power point tracking control (MPPT control) method in a solar power generation system.

  As the MPPT control method, for example, a so-called “mountain climbing method” whose concept is shown in FIG. 11 and disclosed in the following patent document is known, for example.

  The inventor of the present application has found that a plurality of peaks occur in the characteristic (P-V characteristic) of the output power with respect to the output voltage of the solar cell when the solar cell panel is partially shaded, installed in different orientations, or hybridized. Under such circumstances, the power adjustment method using the hill-climbing method when performing MPPT control cannot always accurately detect the maximum power point.

For example, as illustrated in FIG. 1A, when there is no shadow on the solar cell panel, the output characteristic has one peak, that is, the maximum power point as illustrated in FIG. 1B. .
However, as illustrated in FIG. 2A, when the solar cell panel has a partial shadow, the output characteristic has two peaks A and B as illustrated in FIG. 2B. The peak is not limited to two places, and may be three or more.
As described above, when there are a plurality of peaks, the conventional MPPT type power adjustment apparatus may control the last peak B by the MPPT method.

JP 61-194514 A JP 2001-103675 A

  It is desired to improve the conventional “mountain climbing method” so that the MPPT control can be performed accurately even when the solar cell panel is partially shaded, installed in different directions, or mixed.

  The inventor of the present application has solved the above problem by adding a correction device for performing the following processing between the solar cell panel and the MPPT type power adjustment device in the system using the “hill climbing method”.

  That is, the correction device scans the maximum power point of the solar cell and confirms whether or not the operating point in the MPPT type power adjustment device is operating at the maximum power point. For example, when operating at an incorrect point like the peak B illustrated in FIG. 2B, the maximum shown as the peak A illustrated in FIG. The output power is controlled in the direction in which the input power in the MPPT type power adjustment device increases toward the power point voltage, and the input voltage of the MPPT type power adjustment device is corrected to operate at the maximum power point. . Thereafter, power adjustment is performed by the MPPT type power adjustment device.

Therefore, according to the present invention,
Solar cells,
Power that performs tracking control so that the solar cell voltage follows the optimal solar cell current or the optimal solar cell voltage when the output of the solar cell is at the maximum power point, and operates at the obtained maximum power operating point. An adjustment device;
Provided between the solar cell and the power adjustment device, the maximum output of the solar cell is scanned, and when there are multiple peaks, the maximum peak is detected and corrected to the power corresponding to the detected maximum peak Thus, a photovoltaic power generation system having an operating point correction device that inputs to the power adjustment device is provided.

Further, according to the present invention, the maximum power operation obtained by causing the solar cell and the solar cell current to follow the optimal solar cell current or the optimal solar cell voltage when the output of the solar cell is the maximum power point. It is provided between the power adjustment device that performs tracking control so that it operates at a point, scans the maximum output of the solar cell, and if there are multiple peaks, detects the maximum peak and responds to the detected maximum peak There is provided an operating point correction device that corrects the power to the power and inputs the power to the power adjustment device.
The present invention also provides a method for implementing an operating point correction apparatus.

  According to the present invention, even when there are a plurality of output voltage peaks due to partial shadows on the solar cell panel, it is possible to accurately perform power adjustment by the MPPT method.

  Since the correction device of the present invention only needs to be inserted between the solar cell panel and the MPPT type power adjustment device, the existing MPPT type power adjustment device 3 is not modified, and the conventional solar power generation system It can also be applied to.

It is a figure which shows the output voltage-power characteristic when a solar power generation panel does not have a shadow. It is a figure which shows an output voltage-power characteristic when a solar power generation panel has a partial shadow. It is a figure which shows the whole structure of embodiment of the 1st form of the solar energy power generation system of this invention. It is a figure which shows the whole structure of embodiment of the 2nd form of the solar energy power generation system of this invention. It is a circuit diagram of a 1st form of an operating point correction device in an embodiment of a 1st form of a photovoltaic power generation system of the present invention. It is a circuit diagram of the 2nd form of the operating point correction apparatus in embodiment of the 1st form of the solar energy power generation system of this invention. It is a figure which shows the operation | movement aspect of the operating point correction apparatus illustrated in FIG. 5, FIG. It is a figure which shows the specific operation | movement waveform of the solar energy power generation system of this invention. It is a figure which shows the circuit structural example of the power adjustment apparatus of the MPPT system by the "mountain climbing method". It is a flowchart which shows the operation processing of a control apparatus. It is a figure which shows the concept of the "mountain climbing method".

Overall configuration (first form)
FIG. 3 shows the overall configuration of the first embodiment of the photovoltaic power generation system of the present invention.
This solar power generation system is an independent solar power generation system, and includes a solar battery panel 1 (solar power generation panel PV), an operating point correction device 2, a power adjustment device 3, a battery 4, and a load 5. It is configured.

Overall configuration (second form)
FIG. 4 shows the overall configuration of the second embodiment of the photovoltaic power generation system of the present invention.
This solar power generation system is a grid-connected solar power generation system, and includes a solar battery panel 1 (solar power generation panel PV), a correction device 2, a power adjustment device 3, a system power supply 6, and a load 5. It is configured.

The difference between the stand-alone photovoltaic power generation system illustrated in FIG. 3 and the grid-connected solar power generation system illustrated in FIG. 4 is basically the difference between the battery 4 and the system power supply 6.
Hereinafter, the stand-alone photovoltaic power generation system will be described as a representative.

FIG. 5 is a diagram illustrating a first circuit configuration example of the operating point correction device 2 in the stand-alone photovoltaic power generation system illustrated in FIG. 3.
FIG. 6 is a diagram showing a second circuit configuration example of the operating point correction device 2 in the stand-alone photovoltaic power generation system illustrated in FIG.
The operating point correction apparatus 2 illustrated in FIG. 5 and the operating point correction apparatus 2 illustrated in FIG. 6 are the third switch S3 that short-circuits the nodes N1 to N2 in the operating point correction apparatus 2 illustrated in FIG. The only difference is that is provided.

The operating point correction apparatus 2 illustrated in FIGS. 5 and 6 basically includes a first switch S1 and a second switch S2, and the operation of these switches boosts or decreases the input power. -It is configured as a DC converter.
Note that various DC-DC converters such as a step-up type or a step-down type can be used as the DC-DC converter.

The operating point correction device 2 includes, for example, the following components a to l as a step-up DC-DC converter.
a. An ammeter MIpv for measuring (detecting) the output current Ipv of the photovoltaic panel PV;
b. A voltmeter MVpv for measuring (detecting) the output terminal voltage VPV of the photovoltaic panel PV;
c. Although not essential in the present invention, when the output of the photovoltaic power generation panel PV changes greatly, a first capacitor C1 provided to suppress fluctuations;
d. A first switch S1 composed of a transistor with a protective diode for intermittently connecting a circuit from the photovoltaic panel PV to the inductor L;
e. A first diode D1,
f. An ammeter MIL that measures an inductor current IL that is an output current of the first switch S1 and flows through the inductor L;
g. An inductor L;
h. A second switch S2 formed of a transistor with a protective diode that interrupts both ends of the second capacitor C2,
i. A second diode D2 for preventing a short circuit of the second capacitor C2 when the second switch S2 is on;
j. A second capacitor C2 for smoothing;
k. A voltmeter MVL that measures a voltage VL that is an output voltage of the correction device;
l. A DSP as a control processing means for controlling these.

Note that the basic circuit of the DC-DC converter includes an inductor L, a first switch S1, and a second switch S2, and the DSP performs the control.
When the detected value of the ammeter MIpv and the detected value of the voltmeter MVpv are multiplied in the DSP, the output power of the solar cell panel 1 (PV) is obtained. The ammeter MIpv and the voltmeter MVpv In addition, it also functions as a means for calculating the output power of the solar cell panel 1 (PV) in cooperation with the DSP.

  Preferably, as illustrated in FIG. 6, in mode IV in which the power adjustment device 3 operates, in order to reduce power consumption in the operating point correction device 2, a third switch is connected between the nodes N <b> 1 to N <b> 2. S3 can also be provided.

  As the power adjustment device 3, for example, the circuit illustrated in FIG. 9 can be applied. The circuit configuration and operation will be described later.

FIG. 7 is a timing chart showing the operation of the operating point correction apparatus 2.
FIG. 7A shows a time-series operation mode, and four modes I, II, III, and IV are periodically repeated. 6B to 6D show the values of the respective parts in each mode.
Note that the correction period by the operating point correction apparatus 2 is modes I, II, and III.
Mode IV is the voltage at the maximum power point corrected by the operating point correction device 2 in modes I, II, and III, and is adjusted by the power adjustment device 3 by, for example, the hill climbing method. This will be described later.

Mode and Switching Operation In each operation mode, the DSP controls the first switch S1 and the second switch S2 as follows.
Mode I, first switch S1 = off, second switch S2 = off mode II, first switch S1 = on, second switch S2 = on mode III, PWM control (first switch S1, or Second switch S2)
Mode IV, first switch S1 = on, second switch S2 = off

  Preferably, in mode IV, the third switch S3 is further turned on by the DSP to short-circuit between the nodes N1 and N2 of the operating point correction device 2, thereby preventing power consumption in these circuits.

The second switch S2 is turned on by the DSP during the maximum power point detection operation. At this time, the second diode D2 is provided to prevent a short circuit of the second capacitor C2.
The second capacitor C2 is a smoothing capacitor.

The basic operation DSP of the operating point correction apparatus inputs the output current Ipv of the solar battery panel PV (1) detected by the ammeter MIpv and the output terminal voltage Vpv of the photovoltaic power generation panel PV detected by the voltmeter MVpv. To calculate the power of the photovoltaic panel PV.
The DSP scans the maximum power point of the photovoltaic power generation panel PV and checks whether the operating point in the power adjustment device 3 is operating at the maximum power point.
When the power adjustment device 3 is not operating at the maximum power point, the DC-DC converter is driven, and the input power of the power adjustment device 3 increases from the wrong voltage point to the voltage at the maximum power point. Then, the output power is controlled so that the input voltage of the power adjustment device 3, that is, the voltage VL is operated so as to become the maximum power point voltage.

An example of the specific method will be described.
The mode I and correction start DSP inputs the measured value VL of the voltmeter MVL and stores it in the memory at the time t0 in the mode I which is the start mode, and simultaneously performs the first switch S1 and the second switch S2. The output of the photovoltaic power generation panel PV is set to an open state in an off state.
That is, the circuit from the photovoltaic power generation panel PV to the inductor L is cut off, and the circuit of the inductor L, the second capacitor C2, and the first diode D1 is formed. As a result, the output voltage VPV of the photovoltaic power generation panel PV increases to VOP, and the output current IPV decreases according to the characteristics of the first capacitor C1. The output power PPV of the photovoltaic power generation panel PV obtained as the product of the output voltage VPV and the output current IPV rapidly decreases. On the other hand, the current IL decreases linearly according to the characteristics of the inductor L and becomes 0 at t = t1.

In mode II, maximum power point detection mode DSP, first switch S1 and second switch S2 are simultaneously turned on in mode II, that is, during a period of time t1 to t2 illustrated in FIG.
In this example, the photovoltaic power generation panel PV has a partial shadow, and the output power PPV of the photovoltaic power generation panel PV has two peaks (FIG. 6D).
When the first switches S1 and S2 are turned on, the photovoltaic power generation panel PV is connected to the inductor L, and the current IL increases linearly according to the characteristics of the inductor L. Even if the second switch S2 is turned on by the second diode D2, both ends of the second capacitor C2 are not short-circuited.
Due to the above operation, the output terminal voltage VPV of the photovoltaic power generation panel PV changes from the open circuit voltage to “0”. The output current IPV of the photovoltaic power generation panel PV shows a change according to the peak of the output power PPV of the photovoltaic power generation panel PV.
In the DSP, the power is calculated by multiplying the output current Ipv detected by the ammeter MIpv and the output terminal voltage VPV detected by the voltmeter MVpv, and sequentially stored in a DSP memory (not shown). By monitoring this, it becomes possible to reliably detect the maximum power point.
This operation can also be performed by applying PWM control.

The DSP detects the voltage VOP of the photovoltaic power generation panel PV at the detected maximum power point and the voltage Vx of the photovoltaic power generation panel PV at the previous inflection point, and stores them in the memory.
With the load voltage VL during this period as VL`, the DSP compares the voltage magnitude relationships described below.

  In the period of mode II, in t1 to t2, when V0P is on the high voltage side from VL` and VL` <Vx, or VOP is on the low voltage side from VL`, and VL`> Vx In this case, since the operating point is away from the maximum power point, the DSP sets the first switch S1 and the second switch S2 in the OFF state and again sets the photovoltaic panel PV in the period I in the period t2 to t3. In an open state, the inductor current IL flowing through the inductor L is set to “0”. Then, the mode II is set from time t3.

  In mode II, when the output voltage VPV of the photovoltaic power generation panel PV becomes the voltage Vx stored in the memory (t = t3), the mode III is entered.

  On the other hand, in the period t1 to t2, in the case of (VOP <VL ′), the DSP performs the PWM control using the second switch S2 by turning on the first switch S1 in order to increase the voltage. The step-up operation is performed, the reference voltage Vref is obtained by Expression (1), and the output terminal voltage VPV of the photovoltaic power generation panel PV is controlled to be the reference voltage Vref.

  In the formula (1), the reference voltage Vref is the (VX−VOP) / (VL`−VOP) gradient (VL−VOP) based on the voltage VOP of the photovoltaic power generation panel PV at the maximum power point. It means to increase.

  In the period t1 to t2, in the case of (VOP> VL ′), in order to reduce the voltage, the DSP turns off the second switch S2 and performs PWM control using the first switch S1 to step down. By operating, the reference voltage Vref is obtained by the equation (1), and the output terminal voltage VPV of the photovoltaic power generation panel PV is controlled to be the reference voltage Vref.

If the voltage VL of the inductor L becomes the voltage VX in the mode IV and the power adjustment device operation mode t = t5, the DSP turns the first switch S1 on and the second switch S2 off, -Stop operation as a DC converter. This completes the correction process.
Thereby, the power adjustment device 3 adjusts the power corrected by the operating point correction device 2.

By performing the above operation periodically, for example, at a cycle of 1 minute, the output power characteristics with respect to the output voltage VPV of the photovoltaic power generation panel PV, that is, the partial shadow of the photovoltaic power generation panel PV, different orientation installation, and hybrid use, that is, Even when a plurality of peaks occur in the PV characteristics, the maximum power can be detected by the operating point correction device 2.
The power adjustment device 3 performs power adjustment processing on the maximum power detected by the operating point correction device 2 by the method described above.

  During the period from t1 to t2, when VOP is on the high voltage side from VL` and VL`> Vx, or when VOP is on the low voltage side from VL` and VL` <Vx, the operating point is maximum. Since it is in the vicinity of the power point, the DSP stops the operation as the DC-DC converter by shifting to the mode IV, that is, by turning on the first switch S1 and turning off the second switch S2. .

  Preferably, in the mode IV, as illustrated in FIG. 6, the DSP turns on the third switch S3 and shorts between the nodes N1 and N2 so that the inductor L, the second The power consumption in the diode D2 can be reduced.

In this way, the operating point correction device 2 can forcibly move the operating point in the MPPT power adjustment device to the maximum power point.
By performing the above-described operation by the operating point correction device 2 periodically at a constant time period or by an instruction from the user, it is always the maximum for the environmental change with respect to the photovoltaic power generation panel PV. The power point can be detected, and the MPPT type power adjustment device 3 can be operated accordingly.

FIG. 8 shows an example of operation waveforms.
In FIG. 8, the output power of the photovoltaic power generation panel PV before correction by the operating point correction device 2 is 22 W, and the operation of the operating point correction device 2 gradually reduces the input voltage VL of the MPPT type power adjustment device 3. As a result, the optimum operating voltage VOP is changed. After the correction is completed, the output power is greatly increased to 47W.

MPPT power adjustment device 3
FIG. 9 shows a circuit example of the MPPT type power adjustment device 3.
In FIG. 9, the MPPT type power adjustment device 3 includes a solar panel PV, a load 5, and a battery 4 equivalent to those illustrated in FIG. 5. The power adjustment device 3 further includes a step-up DC-DC converter.
That is, the circuit of the power adjustment device 3 is a circuit using a step-up DC-DC converter.
The operating point correction device 2 described above is disposed between the power adjustment device 3 and the solar cell panel PV.
Hereinafter, the power adjustment device 3 will be mainly described.

The step-up DC-DC converter constituting the power adjustment device 3 includes an ammeter MIPVa that measures the output current IPV of the solar cell panel PV corrected by the operating point correction device 2 and the sun corrected by the operating point correction device 2. It has a voltmeter MVPVA that measures the output voltage VPV of the battery panel PV, an inductor La, a switching element Sa, a diode Da, and a smoothing capacitor Ca.
The step-up DC-DC converter further includes a control device using, for example, a microcomputer for performing MPPT control.

The control operation of the “mountain climbing method” will be described with reference to FIGS. 10 and 11.
FIG. 10 is a flowchart showing the operation process of the control device.
FIG. 11 is a diagram illustrating the concept of the “mountain climbing method”.
As illustrated in FIG. 11, the “hill-climbing method” is an on / off drive of the switching element Sa by the control device, and the output side voltage of the inductor La is changed in a certain increment, and the power at that time is calculated. This is a method for detecting the maximum power.

  In Step 1 (S1) in FIG. 10, the control device inputs the output current IPV measured by the ammeter MIPVa and the output voltage VPV measured by the voltmeter MVPVA at the start time, and the output current IPV and the output voltage VPV are input. To calculate the initial output power P0.

  In step 2 (S2), the control device operates the switching element Sa so as to shift the voltage by a voltage step ΔV.

  In step 3 (S3), the control device inputs the output current IPV measured by the ammeter MIPVa and the output voltage VPV measured by the voltmeter MMVPa, and multiplies the output current IPV and the output voltage VPV by that time. Thus, the current power P is calculated.

  In step 4 (S4), the control device compares the initial output power P0 with the current power P.

  When P0> P, in step 5 (S5), the control device inverts the sign of the voltage increment ΔV so that the power decreases. Thereafter, the process proceeds to step 7 (S7).

  When P0 <P, in step 6 (S5), the control device shifts to the processing in step 7 (S7) while keeping the sign of the voltage increment ΔV.

  In step 7 (S7), the control device sets P = P0, and proceeds to the process of step 8 (S8).

  In step 8 (S8), the control device operates the switching element Sa so as to shift the voltage by a voltage step ΔV.

  The control device returns to step 3 (S3) and repeats the above processing until the maximum power is obtained as illustrated in FIG.

  The operating point correction device 2 is disposed in the front stage of the power adjustment device 3. For example, even when there is a shadow of a portion of the solar cell panel PV and there are a plurality of power peaks, the operating point correction device 2 has one maximum peak. Since the power adjustment device 3 is adjusted and applied to the power adjustment device 3, the power adjustment device 3 performs the above-described operation with respect to the maximum power point. Can be controlled.

  Although the stand-alone system illustrated in FIG. 3 has been described above, the same applies to the grid interconnection system illustrated in FIG.

  In addition, as a DC-DC converter applied to the operating point correction apparatus 2, those of various known methods can be applied.

In the above-described embodiment, even if there is a partial shadow in the photovoltaic power generation panel PV and a plurality of peaks in the output of the photovoltaic power generation panel PV by adding the operating point correction device 2. It has been described that the control process in the power adjustment device 3 is performed accurately.
However, since the operating point correction device 2 and the power adjustment device 3 have many common or similar processes such as power calculation, for example, the operating point correction device 2 and the power adjustment device 3 are combined. It can also be.

1 ... Solar cell panel (PV)
2 ... Operating point correction device 3 ... MPPT power adjustment device 4 ... Battery 5 ... Load 6 ... System power supply

Claims (9)

Solar cells,
Power that performs tracking control so that the solar cell voltage follows the optimal solar cell current or the optimal solar cell voltage when the output of the solar cell is at the maximum power point, and operates at the obtained maximum power operating point. An adjustment device;
Provided between the solar cell and the power adjustment device, the maximum output of the solar cell is scanned, and when there are multiple peaks, the maximum peak is detected and corrected to the power corresponding to the detected maximum peak And an operating point correction device that inputs the power to the power adjustment device. The operating point correction device includes:
Means for calculating the output power of the solar cell;
Means for detecting the calculated power peak;
Power adjustment means for detecting the maximum peak when there are a plurality of detected peaks and adjusting the input power of the operating point correction device to be equivalent to the detected peak; and
The photovoltaic power generation system according to claim 1. The means for calculating the output power of the solar cell multiplies the ammeter for detecting the output current of the solar cell, the voltmeter for detecting the output terminal voltage of the solar cell, and the output current and the output terminal voltage. Having arithmetic processing means;
The processing in the means for detecting the calculated power peak is performed by the arithmetic processing means,
When there are a plurality of detected peaks, the power adjustment unit that detects the maximum peak and adjusts the input power of the operating point correction apparatus so that the power corresponds to the detected peak has a DC-DC converter. ,
The photovoltaic power generation system according to claim 2. The operating point correction device includes:
An ammeter for detecting an output current of the solar cell;
A voltmeter for detecting the output terminal voltage of the solar cell;
Arithmetic processing means;
A first switch that is turned on or off by the arithmetic processing means for controlling the power output from the solar cell to the power adjustment device;
An inductor provided at a subsequent stage of the first switch;
A second switch that is provided between the terminals at the subsequent stage of the inductor and is controlled by the arithmetic processing means to open or close between the terminals, and is turned on or off;
The arithmetic processing means includes:
Multiply the detection value of the voltmeter with the detection value of the ammeter that detects the output current of the solar cell to calculate the output power of the solar cell,
Monitor the calculated output power to detect the maximum power point,
Controlling on / off of the first switch and the second switch so as to be the detected maximum power point;
The photovoltaic power generation system according to claim 2. The solar cell and the optimal solar cell current when the output of the solar cell is at the maximum power point are made to follow the solar cell current or the optimal solar cell voltage, and the solar cell voltage is tracked to operate at the maximum power operating point obtained. It is provided between the power adjustment device that performs control, scans the maximum output of the solar cell, and when there are a plurality of peaks, detects the maximum peak, corrects the power according to the detected maximum peak, and Input to the power conditioner,
Operating point correction device. The operating point correction device includes:
Means for calculating the output power of the solar cell;
Means for detecting the calculated power peak;
Power adjustment means for detecting the maximum peak when there are a plurality of detected peaks and adjusting the input power of the operating point correction device to be equivalent to the detected peak; and
The operating point correction apparatus according to claim 5. The means for calculating the output power of the solar cell multiplies the ammeter for detecting the output current of the solar cell, the voltmeter for detecting the output terminal voltage of the solar cell, and the output current and the output terminal voltage. Having arithmetic processing means;
The processing in the means for detecting the calculated power peak is performed by the arithmetic processing means,
When there are a plurality of detected peaks, the power adjustment unit that detects the maximum peak and adjusts the input power of the operating point correction apparatus so that the power corresponds to the detected peak has a DC-DC converter. ,
The operating point correction apparatus according to claim 6. The operating point correction device includes:
An ammeter for detecting an output current of the solar cell;
A voltmeter for detecting the output terminal voltage of the solar cell;
Arithmetic processing means;
A first switch that is turned on or off by the arithmetic processing means for controlling the power output from the solar cell to the power adjustment device;
An inductor provided at a subsequent stage of the first switch;
A second switch that is provided between the terminals at the subsequent stage of the inductor and is controlled by the arithmetic processing means to open or close between the terminals, and is turned on or off;
The arithmetic processing means includes:
Multiply the detection value of the voltmeter with the detection value of the ammeter that detects the output current of the solar cell to calculate the output power of the solar cell,
Monitor the calculated output power, detect the maximum power point,
Controlling on / off of the first switch and the second switch so as to achieve the detected maximum power;
The operating point correction apparatus according to claim 5. The solar cell and the optimal solar cell current when the output of the solar cell is at the maximum power point are made to follow the solar cell current or the optimal solar cell voltage, and the solar cell voltage is tracked to operate at the maximum power operating point obtained. Applied to a photovoltaic power generation system having a power regulating device for controlling,
The operating point correction method of scanning the maximum output of the solar cell, detecting the maximum peak when there are a plurality of peaks, correcting the power to the power corresponding to the detected maximum peak, and inputting the corrected power to the power adjustment device.

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