CN107623488B - Limit Poewr control method, collecting and distributing type photovoltaic combiner box and storage medium - Google Patents
Limit Poewr control method, collecting and distributing type photovoltaic combiner box and storage medium Download PDFInfo
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- CN107623488B CN107623488B CN201710755187.XA CN201710755187A CN107623488B CN 107623488 B CN107623488 B CN 107623488B CN 201710755187 A CN201710755187 A CN 201710755187A CN 107623488 B CN107623488 B CN 107623488B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a kind of limit Poewr control method, collecting and distributing type photovoltaic combiner box and computer readable storage medium, the limit Poewr control method is comprising steps of receive limit power instruction, wherein the limit power instruction includes the performance number for requiring limitation；If receiving the limit power instruction, judges current output power value and require whether the difference of the performance number of limitation is greater than preset value K；If the difference of current output power value and the performance number of requirement limitation is greater than preset value K, the input terminal voltage of the DC/DC converter unit is reduced, so that reducing the operating voltage and output power of the photovoltaic PV array.The present invention can be effectively prevented limit Power operation when there is a situation where inverter DC bus over-voltages；It overcomes in the case where PV array open circuit voltage is high, inverter inverter after small-power operation and the operation of small-power limit for tonnage can not be limited and lead to the problem of DC bus overvoltage protection failure, even component failure.
Description
Technical field
The present invention relates to photovoltaic technology field more particularly to a kind of limit Poewr control method, collecting and distributing type photovoltaic combiner box and
Computer readable storage medium.
Background technique
With the development of photovoltaic power generation technology, the application of photovoltaic plant is more and more wider, and becoming also occurs in simultaneity factor scheme
Change, from initial centralization to current string type, collecting and distributing type etc..In order to save initial outlay cost, cable transmission damage is reduced
Consumption, it is desirable to PV group go here and there it is concatenated more, but this will lead to DC side voltage it is higher, PV open-circuit voltage is in the limiting case
Close to 1000V.For the photovoltaic system of 1000V, it is generally adopted by 1200V pressure resistance IGBT, the highest of corresponding DC bus is protected
Shield point usually in 950V hereinafter, PV open-circuit voltage it is higher, close to 1000V in the case where, the limit of traditional centralized inverter
Power operation mode is to improve input PV voltage to reduce output power, until being increased to the open-circuit voltage close to PV array, this
When output power be reduced to zero.But the DC bus-bar voltage which easilys lead to photovoltaic system is increased to 950V or more and makes
Overvoltage protection occurs for the inverter for obtaining photovoltaic system.
As shown in Figure 1, collecting and distributing type photovoltaic system includes photovoltaic PV array 101, collecting and distributing type header box 102 and gird-connected inverter
103 (alternatively referred to as collecting and distributing type inverters), gird-connected inverter 103 include DC/AC converter unit, the input of DC/AC converter unit
End is connected with the output end of at least one collecting and distributing type header box 102.Collecting and distributing type header box 102 includes DC/DC converter unit, wherein
DC/DC converter unit input terminal be connected with the output end of photovoltaic PV array 101.System of the gird-connected inverter 103 to input terminal
DC bus-bar voltage is detected, and the DC bus-bar voltage of control system operates in the busbar voltage operating point pre-seted；Collection
It dissipates formula header box 102 to detect the input terminal voltage and power of DC/DC converter unit, and does MPPT maximum power point tracking
(MPPT) run, control collecting and distributing type header box 102 in DC/DC converter unit input terminal voltage operate in maximum power point with
The corresponding operating point of track.
Under conditions of limiting Power operation, if collecting and distributing type header box 102 and gird-connected inverter 103 are referring to centralized inversion
The method that input PV voltage is improved in system, then can also there are problems that same overvoltage protection.
Summary of the invention
It is a primary object of the present invention to propose that a kind of limit Poewr control method, collecting and distributing type photovoltaic combiner box and computer can
Read storage medium, it is intended to solve the problems, such as of the existing technology.
To achieve the above object, first aspect of the embodiment of the present invention provides a kind of limit Poewr control method, this method application
In collecting and distributing type photovoltaic combiner box, the collecting and distributing type photovoltaic combiner box includes DC/DC converter unit, the DC/DC converter unit
Input terminal is connected with the output end of photovoltaic PV array；The limit Poewr control method comprising steps of
Limit power instruction is received, wherein the limit power instruction includes the performance number for requiring limitation；
If receiving the limit power instruction, judges current output power value and the difference for the performance number for requiring limitation is
It is no to be greater than preset value K；
If the difference of current output power value and the performance number of requirement limitation is greater than preset value K, reduces the DC/DC and become
The input terminal voltage of unit is changed, so that reducing the operating voltage and output power of the photovoltaic PV array.
Optionally, the method also includes steps:
If the difference of current output power value and the performance number of requirement limitation is not more than preset value K, it is current to continue judgement
Whether the absolute value of the difference of output power value and the performance number of requirement limitation is not more than preset value K；
If the absolute value of the difference of current output power value and the performance number of requirement limitation is not more than preset value K, maintain
The input terminal voltage of the DC/DC converter unit is constant；Otherwise restore MPPT maximum power point tracking operation.
Optionally, the method also includes steps:
If being not received by the limit power instruction, MPPT maximum power point tracking is run.
Optionally, the reception limit power instruction includes:
The limit power instruction that reception collecting and distributing type inverter or upper layer master control monitoring system issue.
Optionally, the preset value K be fixed power numerical constant, collecting and distributing type photovoltaic combiner box rated output power hundred
Divide one of ratio, the percentage of performance number for requiring limitation.
In addition, to achieve the above object, second aspect of the embodiment of the present invention provides a kind of collecting and distributing type photovoltaic combiner box, described
Collecting and distributing type photovoltaic combiner box includes DC/DC converter unit, the output of the input terminal and photovoltaic PV array of the DC/DC converter unit
End is connected；
For receiving the communication unit of limit power instruction, the memory for storing limit Power control procedures and being used for
Execute the processor of the limit Power control procedures；
The step of when the limit Power control procedures are executed by the processor for executing with lower limit Poewr control method:
Limit power instruction is received, wherein the limit power instruction includes the performance number for requiring limitation；
If receiving the limit power instruction, judges current output power value and the difference for the performance number for requiring limitation is
It is no to be greater than preset value K；
If the difference of current output power value and the performance number of requirement limitation is greater than preset value K, reduces the DC/DC and become
The input terminal voltage of unit is changed, so that reducing the operating voltage and output power of the photovoltaic PV array.
Optionally, it is also used to execute when the limit Power control procedures are executed by the processor with lower limit power control side
The step of method:
If the difference of current output power value and the performance number of requirement limitation is not more than preset value K, it is current to continue judgement
Whether the absolute value of the difference of output power value and the performance number of requirement limitation is not more than preset value K；
If the absolute value of the difference of current output power value and the performance number of requirement limitation is not more than preset value K, maintain
The input terminal voltage of the DC/DC converter unit is constant；Otherwise restore MPPT maximum power point tracking operation.
Optionally, it is also used to execute when the limit Power control procedures are executed by the processor with lower limit power control side
The step of method:
If being not received by the limit power instruction, MPPT maximum power point tracking is run.
Optionally, it is also used to execute when the limit Power control procedures are executed by the processor with lower limit power control side
The step of method:
The limit power instruction that reception collecting and distributing type inverter or upper layer master control monitoring system issue.
Furthermore to achieve the above object, the third aspect of the embodiment of the present invention provides a kind of computer readable storage medium, institute
It states and stores limited Power control procedures on computer readable storage medium, it is real when the limit Power control procedures are executed by processor
Now the step of limit Poewr control method as described in relation to the first aspect.
Limit Poewr control method, collecting and distributing type photovoltaic combiner box and computer-readable storage medium provided in an embodiment of the present invention
Matter reduces collecting and distributing type light by judging current output power value and the difference of the performance number limited being required whether to be greater than preset value
The input terminal voltage of header box is lied prostrate, so that reducing the operating voltage and output power of photovoltaic PV array；Limit can be effectively prevented
There is a situation where inverter DC bus over-voltages when Power operation；It overcomes in the case where PV array open circuit voltage is high, it can not
Limit inverter small-power run and the operation of small-power limit for tonnage after inverter generate DC bus overvoltage protection failure, very
The problem of to component failure.
Detailed description of the invention
Fig. 1 is the collecting and distributing type schematic diagram of photovoltaic system structure of the embodiment of the present invention；
Fig. 2 is the limit Poewr control method flow diagram of the embodiment of the present invention；
Fig. 3 is another flow diagram of limit Poewr control method of the embodiment of the present invention；
Fig. 4 is the collecting and distributing type photovoltaic combiner box structural schematic diagram of the embodiment of the present invention；
Fig. 5 is electric current, voltage and the changed power structural schematic diagram of the photovoltaic PV array of the embodiment of the present invention；
Fig. 6 is that the MPPT of the collecting and distributing type photovoltaic combiner box of the embodiment of the present invention runs control structure schematic diagram；
Fig. 7 is the control structure schematic diagram of the collecting and distributing type inverter of the embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The each embodiment of the present invention is realized in description with reference to the drawings.In subsequent description, using for indicating
The suffix of such as " module ", " component " or " unit " of element is only for being conducive to explanation of the invention, and there is no special for itself
Fixed meaning.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
First embodiment
The present embodiment in order to better understand is now said with electric current, voltage and the changed power of the photovoltaic PV array of Fig. 5
It is bright:
It can be seen from the figure that the corresponding voltage of maximal power tracing point Pmax of photovoltaic PV array is Vmp.If control
Direction controlling of the output voltage V of photovoltaic PV array from maximal power tracing point Vmp toward Vpv=0, then photovoltaic PV array exports
Power then gradually reduce, until be zero.So when requiring inverter small-power limit for tonnage to run, it is desirable that photovoltaic PV array
Output power P very little, currently existing scheme be allow the operating voltage Vpv of photovoltaic PV array to be increased to close to open-circuit voltage Voc, but
If being currently exactly temperature low winter, the photovoltaic PV array voltage Vpv of practical small-power limit Power operation is relatively high, may
More than the over-voltage protection point of inverter, lead to inverter over-voltage fault.The present embodiment is opposite with currently existing scheme, controls photovoltaic
The operating voltage Vpv of PV array is reduced, mobile towards the direction of Vpv=0.
As shown in Fig. 2, first embodiment of the invention provides a kind of limit Poewr control method, this method is applied to collecting and distributing type light
Header box is lied prostrate, the collecting and distributing type photovoltaic combiner box includes DC/DC converter unit, the input terminal and light of the DC/DC converter unit
The output end for lying prostrate PV array is connected；The specific structure of collecting and distributing type photovoltaic system can refer to attached drawing 1 and narration above, herein not
It repeats.It should be noted that this is not restricted for the specific structure of DC/DC converter unit.
The limit Poewr control method comprising steps of
21, limit power instruction is received, wherein the limit power instruction includes the performance number for requiring limitation；
In the present embodiment, the reception limit power instruction includes: to receive collecting and distributing type inverter or upper layer master control monitoring
The limit power instruction that system issues.
If 22, receiving the limit power instruction, judges current output power value and require the difference of the performance number of limitation
Whether value is greater than preset value K；
In the present embodiment, the preset value K is fixed power numerical constant, collecting and distributing type photovoltaic combiner box rated output function
One of the percentage of rate, the percentage of performance number for requiring limitation.
If 23, the difference of current output power value and the performance number of requirement limitation is greater than preset value K, the DC/ is reduced
The input terminal voltage of DC converter unit, so that reducing the operating voltage and output power of the photovoltaic PV array.
It please refers to shown in Fig. 3, in one embodiment, the method also includes steps:
If 24, the difference of current output power value and the performance number of requirement limitation is not more than preset value K, continues judgement and work as
Whether the absolute value of the difference of preceding output power value and the performance number of requirement limitation is not more than preset value K；
If 25, the absolute value of the difference of current output power value and the performance number of requirement limitation is not more than preset value K, tie up
The input terminal voltage for holding the DC/DC converter unit is constant；
26, otherwise restore MPPT maximum power point tracking operation.
It refer again to shown in Fig. 3, in another embodiment, the method also includes steps:
If 27, being not received by the limit power instruction, MPPT maximum power point tracking is run.
In order to further illustrate the present embodiment, now to MPPT maximum power point tracking and collecting and distributing type inversion by taking Fig. 6 and Fig. 7 as an example
The control of device is illustrated.
Fig. 6 is that a kind of MPPT of the collecting and distributing type photovoltaic combiner box of the present embodiment runs control structure.Sample photovoltaic PV array
Input voltage V and electric current I, calculate current power, and run MPPT algorithm, the DC/DC transformation for obtaining collecting and distributing type header box is single
The voltage reference value Vref that the Voltage loop of member is adjusted；Voltage reference value Vref makes comparisons with actual input voltage Vf to be adjusted with PI
Later, the current reference value Iref (not shown) of electric current loop adjusting is obtained；Current reference value Iref and actual electric current
Idcf is compared to be adjusted with PI, and PWM_CMP signal is exported after clipping.
Fig. 7 is the control structure schematic diagram of the collecting and distributing type inverter of the embodiment of the present invention.The Udcref of setting is collecting and distributing type
The d-c bus voltage value of photovoltaic system, the value are set by collecting and distributing type inverter and are controlled, the practical electricity at collecting and distributing type header box end
Pressure also needs to consider the cable transmission pressure drop (typically constituting from the 1~2% of photovoltaic system DC bus-bar voltage Udc) of long-distance cable.
Collecting and distributing type inverter constant-pressure operation, voltage gives Udcref and feedback Udc does PI adjusting, and the output Idef of pi regulator is as collection
It dissipates the given instruction of active component of formula inverter output current, then is PI with the active component Id of current feedback and adjusts to obtain d axis
Regulated quantity Ucd.Iqref is obtained divided by Us by the idle given instruction Qref that master control issues, (is issued if being not received by master control
Reactive command, then Qref=0), the as reactive component given value of collecting and distributing type inverter output current.Iqref is anti-with electric current
The reactive component Iq of feedback is PI and adjusts to obtain q axis regulated quantity Ucq.Regulated quantity Ucd and Ucq turn by three or two transformation of dq to abc
After being changed to the amount on a, b, c coordinate, it is sent to PWM generator, and then control the turn-on and turn-off of IGBT in collecting and distributing type inverter.
Limit Poewr control method provided in an embodiment of the present invention, by judging current output power value and requiring the function of limitation
Whether the difference of rate value is greater than preset value, reduces the input terminal voltage of collecting and distributing type photovoltaic combiner box, so that reducing photovoltaic PV gusts
The operating voltage and output power of column；Can be effectively prevented limit Power operation when there is a situation where inverter DC bus over-voltages；
It overcomes in the case where PV array open circuit voltage is high, inverter can not be limited in small-power operation and small-power limit for tonnage fortune
Inverter leads to the problem of DC bus overvoltage protection failure, even component failure after row.
Second embodiment
A kind of collecting and distributing type photovoltaic combiner box, the collecting and distributing type photovoltaic are provided referring to Fig. 4, Fig. 4 for second embodiment of the invention
Header box includes DC/DC converter unit 33, and the output end of the input terminal and photovoltaic PV array of the DC/DC converter unit 33 is (attached
It is not shown go out) be connected；
For receive limit power instruction communication unit 34, for store limit Power control procedures memory 31 and
For executing the processor 32 of the limit Power control procedures；
For executing with the step of lower limit Poewr control method when the limit Power control procedures are executed by the processor 32
It is rapid:
Limit power instruction is received, wherein the limit power instruction includes the performance number for requiring limitation；
If receiving the limit power instruction, judges current output power value and the difference for the performance number for requiring limitation is
It is no to be greater than preset value K；
If the difference of current output power value and the performance number of requirement limitation is greater than preset value K, reduces the DC/DC and become
The input terminal voltage of unit is changed, so that reducing the operating voltage and output power of the photovoltaic PV array.
In one embodiment, it is also used to execute when the limit Power control procedures are executed by the processor 32 following
The step of limiting Poewr control method:
If the difference of current output power value and the performance number of requirement limitation is not more than preset value K, it is current to continue judgement
Whether the absolute value of the difference of output power value and the performance number of requirement limitation is not more than preset value K；
If the absolute value of the difference of current output power value and the performance number of requirement limitation is not more than preset value K, maintain
The input terminal voltage of the DC/DC converter unit is constant；Otherwise restore MPPT maximum power point tracking operation.
In one embodiment, it is also used to execute when the limit Power control procedures are executed by the processor 32 following
The step of limiting Poewr control method:
If being not received by the limit power instruction, MPPT maximum power point tracking is run.
In another embodiment, be also used to when the limit Power control procedures are executed by the processor 32 execute with
The step of lower power control method:
The limit power instruction that reception collecting and distributing type inverter or upper layer master control monitoring system issue.
Collecting and distributing type photovoltaic combiner box provided in an embodiment of the present invention, by judging current output power value and requiring limitation
Whether the difference of performance number is greater than preset value, reduces the input terminal voltage of collecting and distributing type photovoltaic combiner box, so that reducing photovoltaic PV
The operating voltage and output power of array；The feelings of inverter DC bus over-voltage occur when limit Power operation can be effectively prevented
Condition；It overcomes in the case where PV array open circuit voltage is high, inverter can not be limited in small-power operation and small-power limit for tonnage
Inverter leads to the problem of DC bus overvoltage protection failure, even component failure after operation.
3rd embodiment
Third embodiment of the invention provides a kind of computer readable storage medium, deposits on the computer readable storage medium
Limit Power control procedures are contained, limit power described in first embodiment is realized when the limit Power control procedures are executed by processor
The step of control method.
Computer readable storage medium provided in an embodiment of the present invention, by judging current output power value and requiring to limit
The difference of performance number whether be greater than preset value, the input terminal voltage of collecting and distributing type photovoltaic combiner box is reduced, so that reducing photovoltaic
The operating voltage and output power of PV array；The feelings of inverter DC bus over-voltage occur when limit Power operation can be effectively prevented
Condition；It overcomes in the case where PV array open circuit voltage is high, inverter can not be limited in small-power operation and small-power limit for tonnage
Inverter leads to the problem of DC bus overvoltage protection failure, even component failure after operation.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of limit Poewr control method, this method is applied to collecting and distributing type photovoltaic combiner box, the collecting and distributing type photovoltaic conflux luggage
DC/DC converter unit is included, the input terminal of the DC/DC converter unit is connected with the output end of photovoltaic PV array；The limit power
Control method comprising steps of
The limit power instruction that reception collecting and distributing type inverter or upper layer master control monitoring system issue, wherein the limit power instruction packet
Include the performance number for requiring limitation；
If receiving the limit power instruction, judge whether current output power value and the difference for the performance number for requiring limitation are big
In preset value K；
If the difference of current output power value and the performance number of requirement limitation is greater than preset value K, it is single to reduce the DC/DC transformation
The input terminal voltage of member, so that reducing the operating voltage and output power of the photovoltaic PV array.
2. a kind of limit Poewr control method according to claim 1, which is characterized in that the method also includes steps:
If the difference of current output power value and the performance number of requirement limitation is not more than preset value K, continue to judge currently to export
Whether the absolute value of the difference of performance number and the performance number of requirement limitation is not more than preset value K；
If current output power value and require limitation performance number difference absolute value be not more than preset value K, maintain described in
The input terminal voltage of DC/DC converter unit is constant；Otherwise restore MPPT maximum power point tracking operation.
3. a kind of limit Poewr control method according to claim 1, which is characterized in that the method also includes steps:
If being not received by the limit power instruction, MPPT maximum power point tracking is run.
4. a kind of limit Poewr control method according to claim 1 to 3, which is characterized in that the preset value K is solid
The percentage of fixed power numerical constant, collecting and distributing type photovoltaic combiner box rated output power, the percentage for requiring the performance number limited
One of.
5. a kind of collecting and distributing type photovoltaic combiner box, which is characterized in that the collecting and distributing type photovoltaic combiner box includes DC/DC converter unit,
The input terminal of the DC/DC converter unit is connected with the output end of photovoltaic PV array；
For receiving the communication unit of limit power instruction, the memory for storing limit Power control procedures and for executing
The processor of the limit Power control procedures；
The step of when the limit Power control procedures are executed by the processor for executing with lower limit Poewr control method:
The limit power instruction that reception collecting and distributing type inverter or upper layer master control monitoring system issue, wherein the limit power instruction packet
Include the performance number for requiring limitation；
If receiving the limit power instruction, judge whether current output power value and the difference for the performance number for requiring limitation are big
In preset value K；
If the difference of current output power value and the performance number of requirement limitation is greater than preset value K, it is single to reduce the DC/DC transformation
The input terminal voltage of member, so that reducing the operating voltage and output power of the photovoltaic PV array.
6. a kind of collecting and distributing type photovoltaic combiner box according to claim 5, which is characterized in that the limit Power control procedures quilt
The processor is also used to the step of executing with lower limit Poewr control method when executing:
If the difference of current output power value and the performance number of requirement limitation is not more than preset value K, continue to judge currently to export
Whether the absolute value of the difference of performance number and the performance number of requirement limitation is not more than preset value K；
If current output power value and require limitation performance number difference absolute value be not more than preset value K, maintain described in
The input terminal voltage of DC/DC converter unit is constant；Otherwise restore MPPT maximum power point tracking operation.
7. a kind of collecting and distributing type photovoltaic combiner box according to claim 5, which is characterized in that the limit Power control procedures quilt
The processor is also used to the step of executing with lower limit Poewr control method when executing:
If being not received by the limit power instruction, MPPT maximum power point tracking is run.
8. a kind of computer readable storage medium, which is characterized in that store limited power on the computer readable storage medium
Program is controlled, limit function according to any one of claims 1 to 4 is realized when the limit Power control procedures are executed by processor
The step of rate control method.
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| CN110707679B (en) * | 2019-11-22 | 2021-05-14 | 中国联合网络通信集团有限公司 | Voltage control method and photovoltaic power supply device and system |
| CN112421681B (en) * | 2020-12-10 | 2022-02-15 | 深圳科士达科技股份有限公司 | Maximum power tracking method and system |
| CN112817341B (en) * | 2021-02-03 | 2023-09-29 | 阳光电源股份有限公司 | Photovoltaic tracking support control method, photovoltaic tracking controller and photovoltaic tracking system |
| CN116760107B (en) * | 2023-08-16 | 2023-12-12 | 锦浪科技股份有限公司 | Method, system and storage medium for over-distribution load limiting of photovoltaic inverter |
| CN116774769A (en) * | 2023-08-23 | 2023-09-19 | 江苏纳通能源技术有限公司 | MPPT (maximum Power Point tracking) fast high-precision power control method, system, equipment and medium |
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| CN104779636A (en) * | 2014-01-15 | 2015-07-15 | 控制技术有限公司 | Method and system for controlling power output of an inverter |
| CN103855726A (en) * | 2014-03-05 | 2014-06-11 | 深圳市长昊机电有限公司 | Photovoltaic power generation control system and control method of photovoltaic power generation system |
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