CN106786750A - Photovoltaic parallel in system and photovoltaic combining inverter - Google Patents
Photovoltaic parallel in system and photovoltaic combining inverter Download PDFInfo
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- CN106786750A CN106786750A CN201611227832.2A CN201611227832A CN106786750A CN 106786750 A CN106786750 A CN 106786750A CN 201611227832 A CN201611227832 A CN 201611227832A CN 106786750 A CN106786750 A CN 106786750A
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- 230000007935 neutral effect Effects 0.000 claims abstract description 82
- 230000000452 restraining effect Effects 0.000 claims abstract description 34
- 230000000694 effects Effects 0.000 abstract description 20
- 230000001629 suppression Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 239000011800 void material Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
This application discloses photovoltaic parallel in system and photovoltaic combining inverter, to suppress the PID effects in photovoltaic parallel in system.The photovoltaic parallel in system includes many photovoltaic combining inverters, each the photovoltaic array of the direct current side joint independence of photovoltaic combining inverter, AC are in parallel, in addition, the photovoltaic parallel in system also includes that PID restraining devices and each photovoltaic combining inverter correspond the dummy neutral device for setting and the gate-controlled switch that setting is corresponded with each photovoltaic combining inverter, wherein：Each described dummy neutral device is used to be that the photovoltaic combining inverter corresponding with this dummy neutral device constructs a dummy neutral；Each described gate-controlled switch is connected between the dummy neutral of the photovoltaic combining inverter corresponding with this gate-controlled switch and negative busbar；The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, for the dummy neutral voltage-to-ground of each photovoltaic combining inverter of lifting.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more specifically to photovoltaic parallel in system and photovoltaic grid-connected inversion
Device.
Background technology
PID (potential Induced Degradation, potential induction attenuation) effect, refers on photovoltaic module
Cell piece and framework between apply high intensity negative voltage and make the phenomenon of photovoltaic module performance continuous decrement, it be influence photovoltaic
One of key factor of grid-connected system generated energy.How effectively to suppress PID effects, be photovoltaic industry problem demanding prompt solution.
The content of the invention
In view of this, the invention provides photovoltaic parallel in system and photovoltaic combining inverter, to suppress photovoltaic parallel in system
In PID effects.
A kind of photovoltaic parallel in system, including many photovoltaic combining inverters, each direct current side joint of photovoltaic combining inverter
Independent photovoltaic array, AC parallel connection, additionally, the photovoltaic parallel in system also includes PID restraining devices and each photovoltaic simultaneously
Net inverter corresponds the dummy neutral device for setting, and corresponded with each photovoltaic combining inverter set can
Control switch, wherein：
It is the photovoltaic grid-connected inversion corresponding with this dummy neutral device that each described dummy neutral device is used for
Device constructs a dummy neutral；
Each described gate-controlled switch is connected to the virtual neutrality of the photovoltaic combining inverter corresponding with this gate-controlled switch
Between point and negative busbar；
The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, each for lifting
The dummy neutral voltage-to-ground of platform photovoltaic combining inverter.
Wherein, the photovoltaic combining inverter is three-phase four-wire system photovoltaic combining inverter, or, it is described grid-connected inverse
It is three-phase three-wire system photovoltaic combining inverter to become device.
A kind of photovoltaic parallel in system, including many photovoltaic combining inverters, each direct current side joint of photovoltaic combining inverter
Independent photovoltaic array, AC are in parallel, additionally, the photovoltaic parallel in system also include PID restraining devices and with each light
Volt combining inverter corresponds the gate-controlled switch for setting, wherein：
Each described gate-controlled switch be connected to the neutral point of the photovoltaic combining inverter corresponding with this gate-controlled switch with
Between negative busbar；
The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, each for lifting
The dummy neutral voltage-to-ground of platform photovoltaic combining inverter.
Wherein, the gate-controlled switch is mechanical switch or switching tube.
Wherein, the mechanical switch is relay；The switching tube is triode, MOSFET or IGBT.
A kind of photovoltaic combining inverter, is applied to photovoltaic parallel in system, and the photovoltaic parallel in system includes many light
Volt combining inverter, each the photovoltaic array of the direct current side joint independence of the photovoltaic combining inverter, AC are in parallel, additionally,
The photovoltaic parallel in system also includes PID restraining devices；The PID restraining devices are connected to each photovoltaic combining inverter
Grid entry point and the earth between；
The photovoltaic combining inverter has dummy neutral device and gate-controlled switch, wherein：
The dummy neutral device is used to construct a dummy neutral for the photovoltaic combining inverter；
The PID restraining devices are used for dummy neutral voltage-to-ground described in lifting；
The gate-controlled switch is connected between the dummy neutral and negative busbar.
Wherein, the photovoltaic combining inverter is three-phase four-wire system photovoltaic combining inverter, or, it is described grid-connected inverse
It is three-phase three-wire system photovoltaic combining inverter to become device.
A kind of photovoltaic combining inverter, is applied to photovoltaic parallel in system, and the photovoltaic parallel in system includes many light
Volt combining inverter, each the photovoltaic array of the direct current side joint independence of the photovoltaic combining inverter, AC are in parallel, additionally,
The photovoltaic parallel in system also includes PID restraining devices；The PID restraining devices are connected to each photovoltaic combining inverter
Grid entry point and the earth between, for the neutral point voltage-to-ground of each photovoltaic combining inverter of lifting；
The photovoltaic combining inverter has gate-controlled switch, wherein, the gate-controlled switch is connected to the neutral point and bears
Between bus.
Wherein, the gate-controlled switch is mechanical switch or switching tube.
Wherein, the mechanical switch is relay；The switching tube is triode, MOSFET or IGBT.
It can be seen from above-mentioned technical scheme that, the present invention using be arranged on each grid entry point of photovoltaic combining inverter with
It is electric over the ground that PID restraining devices between the earth carry out each dummy neutral of photovoltaic combining inverter (or neutral point) of lifting simultaneously
Pressure, for any photovoltaic combining inverter, when it is in grid-connected state, lifting dummy neutral (or it is neutral
Point) voltage-to-ground, also the negative busbar voltage-to-ground with regard to lifting such that it is able to the negative busbar voltage-to-ground is increased to about 0V, prevent
Only photovoltaic array continues to produce PID effects；It is of the invention by void after it enters standby, shutdown or other non-grid-connected states
Intend neutral point (or neutral point) to be connected with negative busbar, negative busbar voltage-to-ground is raised to greater value, this value is much larger than
0V such that it is able to eliminate the PID effects that photovoltaic array was produced originally.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of photovoltaic parallel in system structural representation disclosed in the embodiment of the present invention；
Fig. 2 is another photovoltaic parallel in system structural representation disclosed in the embodiment of the present invention；
Fig. 3 is another photovoltaic parallel in system structural representation disclosed in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1~Fig. 2, the embodiment of the invention discloses a kind of photovoltaic parallel in system, including many photovoltaic grid-connected inversions
Device, each the photovoltaic array of the direct current side joint independence of photovoltaic combining inverter, AC are in parallel, additionally, the grid-connected system
System also includes PID restraining devices and each photovoltaic combining inverter corresponds the dummy neutral device for setting, and with it is each
Platform photovoltaic combining inverter corresponds the gate-controlled switch for setting, wherein：
It is the photovoltaic grid-connected inversion corresponding with this dummy neutral device that each described dummy neutral device is used for
Device constructs a dummy neutral N；
Each described gate-controlled switch is connected to the virtual neutrality of the photovoltaic combining inverter corresponding with this gate-controlled switch
Between point and negative busbar；
The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, each for lifting
The dummy neutral voltage-to-ground of platform photovoltaic combining inverter.
Below, technical scheme described in the present embodiment is parsed.
The principle that PID effects according to " background technology " introduction are produced, it is known that suppress PID effects technological means it
One is：The negative pole voltage-to-ground of lifting photovoltaic module, makes the negative pole of photovoltaic module to the earth in positive bias voltage or close to 0V
Voltage, to avoid having high intensity negative voltage on photovoltaic module.
Photovoltaic array is formed by multiple photovoltaic module connection in series-parallel, equivalent to a powerful photovoltaic module, is suppressed
The PID effects of the photovoltaic array, namely the PID effects that inhibit all photovoltaic modulies in the photovoltaic array.
The present embodiment be each photovoltaic array configuration PID suppression circuit structure it is identical, and work independently from each other, mutually not
Influence.For any one photovoltaic array therein, its PID suppression circuit includes：The light being connected with this photovoltaic array
Volt combining inverter, the gate-controlled switch and this photovoltaic combining inverter corresponding with this photovoltaic combining inverter is corresponding
Dummy neutral device, and shared PID restraining devices of each PID suppression circuit.
The operation principle of the PID suppression circuit is as follows.
Because the negative pole of photovoltaic array has directly electrical connection with the negative busbar of photovoltaic combining inverter, so lifting
The negative pole voltage-to-ground of photovoltaic array suppresses the PID effects of photovoltaic array, that is, lifting photovoltaic combining inverter negative mother
Line-to-earth voltage suppresses the PID effects of photovoltaic array, specifically：When photovoltaic combining inverter is in grid-connected state,
By the negative busbar voltage-to-ground lifting of photovoltaic combining inverter to be equal to or slightly higher than 0V, photovoltaic grid-connected inversion can not influenceed
Device normally on the premise of operation, prevents photovoltaic array from continuing to produce PID effects；Further, since PID effects have invertibity, institute
With after photovoltaic combining inverter enters standby, shutdown or other non-grid-connected states, by the negative mother of photovoltaic combining inverter
Line-to-earth voltage lifting is a higher voltage value, and such as 400V (applies high intensity positive voltage), can eliminate light to photovoltaic array
The PID effects that photovoltaic array was produced originally.
When photovoltaic combining inverter is three-phase four-wire system photovoltaic combining inverter (referring to Fig. 2), inverter possesses in itself
Neutral point N*；When photovoltaic combining inverter is three-phase three-wire system photovoltaic combining inverter (referring to Fig. 1), inverter is in itself not
Possess neutral point, but a dummy neutral N, the void can be constructed by configuring a dummy neutral device for it
Intend neutral point N and the neutral point N* equipotentials.
When photovoltaic combining inverter be in grid-connected state when (photovoltaic combining inverter and network relay close
When), keep gate-controlled switch to disconnect, because dummy neutral N (or neutral point N*) and the bus midpoint O of photovoltaic combining inverter are
It is approximate equipotential, so PID restraining device lifting dummy neutral N (or neutral point N*) voltage-to-ground, that is, lifting
The bus midpoint O voltage-to-grounds of photovoltaic combining inverter；And the voltages of the bus midpoint O with respect to negative busbar of photovoltaic combining inverter
It is fixed, so the bus midpoint O voltage-to-grounds of lifting photovoltaic combining inverter, that is, lifting photovoltaic combining inverter
Negative busbar voltage-to-ground.Illustrate, it is assumed that when photovoltaic combining inverter is in grid-connected state, O is relative at bus midpoint
The voltage of negative busbar is equal to 400V, and PID restraining devices for being by dummy neutral N (or neutral point N*) voltage-to-ground lifting
400V, then now the negative busbar voltage-to-ground of photovoltaic combining inverter is 0V, and realizing prevents photovoltaic array from continuing to produce PID to imitate
The function of answering.
(the photovoltaic combining inverter when photovoltaic combining inverter enters standby, shutdown or other non-grid-connected states
And network relay when disconnecting), close gate-controlled switch, now dummy neutral N (or neutral point N*) of photovoltaic combining inverter
There is directly electrical connection with negative busbar, so PID restraining devices lifting dummy neutral N (or neutral point N*) is electric over the ground
Pressure, that is, the lifting negative busbar voltage-to-ground of photovoltaic combining inverter.Appoint and continue to use above-mentioned example, PID restraining devices are used for
By the lifting of dummy neutral N (or neutral point N*) voltage-to-ground be 400V, then photovoltaic combining inverter enter it is standby, shut down or its
After his non-grid-connected state, the negative busbar voltage-to-ground of photovoltaic combining inverter is 400V, realizes elimination photovoltaic array former
Come the function of PID effects of producing.
From the foregoing, it will be observed that the circuit structure based on the PID suppression circuit, it is only necessary to run shape according to photovoltaic combining inverter
The change of state controls corresponding gate-controlled switch action, you can prevents photovoltaic array from continuing to produce PID effects, and eliminates photovoltaic battle array
The original PID effects for producing of row.
Additionally, referring to Fig. 2, the embodiment of the invention discloses another photovoltaic parallel in system, including many grid-connected inverse
Become device, each the photovoltaic array of the direct current side joint independence of photovoltaic combining inverter, AC are in parallel, additionally, described grid-connected
System also includes PID restraining devices and the gate-controlled switch set with each photovoltaic combining inverter one-to-one corresponding, wherein：
Each described gate-controlled switch be connected to the neutral point of the photovoltaic combining inverter corresponding with this gate-controlled switch with
Between negative busbar；
The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, each for lifting
The dummy neutral voltage-to-ground of platform photovoltaic combining inverter.
Photovoltaic parallel in system shown in Fig. 2 is differed only in photovoltaic parallel in system shown in Fig. 1：It is grid-connected shown in Fig. 1
Photovoltaic combining inverter in system possesses dummy neutral device, therefore can be three-phase three-wire system photovoltaic combining inverter,
It can also be three-phase four-wire system photovoltaic combining inverter；And the photovoltaic combining inverter in photovoltaic parallel in system shown in Fig. 2 does not have
Standby dummy neutral device, therefore can only be three-phase four-wire system photovoltaic combining inverter.In addition, two photovoltaic parallel in system solution
Certainly the principle of technical problem is identical, repeats no more.
Additionally, the embodiment of the invention also discloses a kind of photovoltaic combining inverter, being applied to photovoltaic parallel in system, the light
Volt grid-connected system includes many photovoltaic combining inverters, each light of the direct current side joint independence of the photovoltaic combining inverter
Photovoltaic array, AC are in parallel, additionally, the photovoltaic parallel in system also includes PID restraining devices；The PID restraining devices connection
Between the grid entry point and the earth of each photovoltaic combining inverter；
The photovoltaic combining inverter has dummy neutral device and gate-controlled switch, wherein：
The dummy neutral device is used to construct a dummy neutral for the photovoltaic combining inverter；
The PID restraining devices are used for dummy neutral voltage-to-ground described in lifting；
The gate-controlled switch is connected between the dummy neutral and negative busbar.
Wherein, the photovoltaic combining inverter is three-phase four-wire system photovoltaic combining inverter, or, it is described grid-connected
Inverter is three-phase three-wire system photovoltaic combining inverter.
Additionally, the embodiment of the invention also discloses another photovoltaic combining inverter, photovoltaic parallel in system is applied to, it is described
Photovoltaic parallel in system includes many photovoltaic combining inverters, each direct current side joint independence of the photovoltaic combining inverter
Photovoltaic array, AC are in parallel, it is characterised in that the photovoltaic parallel in system also includes PID restraining devices；The PID suppresses
Device is connected between the grid entry point of each photovoltaic combining inverter and the earth, described grid-connected inverse for each of lifting
Become the neutral point voltage-to-ground of device；
The photovoltaic combining inverter has gate-controlled switch, wherein, the gate-controlled switch is connected to the neutral point and bears
Between bus.
In any of the above-described embodiment, the gate-controlled switch can be such as relay mechanical switch, may also be such as three poles
Pipe, MOSFET (Metal Oxide Semiconductor FET, mos field effect transistor), IGBT
Switching tubes such as (Insulated Gate Bipolar Transistor, igbt).
In sum, the present invention is using the PID suppressions being arranged between the grid entry point of each photovoltaic combining inverter and the earth
Device processed simultaneously each dummy neutral of photovoltaic combining inverter (or neutral point) voltage-to-ground of lifting, for any light
For volt combining inverter, when it is in grid-connected state, lifting dummy neutral (or neutral point) voltage-to-ground, also
Lifting negative busbar voltage-to-ground such that it is able to make the negative busbar voltage-to-ground increase to about 0V, prevents photovoltaic array from continuing to produce
Raw PID effects；When its enter it is standby, shut down or after other non-grid-connected states, the present invention is (or neutral by dummy neutral
Point) connected with negative busbar, negative busbar voltage-to-ground is raised to greater value, this value is much larger than 0V such that it is able to eliminate
The PID effects that photovoltaic array was produced originally.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case of the spirit or scope for not departing from the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent scope most wide of features of novelty.
Claims (10)
1. a kind of photovoltaic parallel in system, including many photovoltaic combining inverters, the direct current side joint of each photovoltaic combining inverter is only
Vertical photovoltaic array, AC parallel connection, it is characterised in that the photovoltaic parallel in system also includes PID restraining devices and each light
Volt combining inverter corresponds the dummy neutral device for setting, and corresponds setting with each photovoltaic combining inverter
Gate-controlled switch, wherein：
It is the photovoltaic combining inverter structure corresponding with this dummy neutral device that each described dummy neutral device is used for
Make a dummy neutral；
Each described gate-controlled switch be connected to the dummy neutral of the photovoltaic combining inverter corresponding with this gate-controlled switch with
Between negative busbar；
The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, for each light of lifting
Lie prostrate the dummy neutral voltage-to-ground of combining inverter.
2. photovoltaic parallel in system according to claim 1, it is characterised in that the photovoltaic combining inverter is three-phase and four-line
Photovoltaic combining inverter processed, or, the photovoltaic combining inverter is three-phase three-wire system photovoltaic combining inverter.
3. a kind of photovoltaic parallel in system, including many photovoltaic combining inverters, the direct current side joint of each photovoltaic combining inverter is only
Vertical photovoltaic array, AC are in parallel, it is characterised in that the photovoltaic parallel in system also include PID restraining devices and with it is each
Platform photovoltaic combining inverter corresponds the gate-controlled switch for setting, wherein：
Each described gate-controlled switch is connected to the neutral point of the photovoltaic combining inverter corresponding with this gate-controlled switch and negative mother
Between line；
The PID restraining devices are connected between the grid entry point of each photovoltaic combining inverter and the earth, for each light of lifting
Lie prostrate the dummy neutral voltage-to-ground of combining inverter.
4. the photovoltaic parallel in system according to claim 1,2 or 3, it is characterised in that the gate-controlled switch is mechanical switch
Or switching tube.
5. photovoltaic parallel in system according to claim 4, it is characterised in that the mechanical switch is relay；It is described to open
It is triode, MOSFET or IGBT to close pipe.
6. a kind of photovoltaic combining inverter, is applied to photovoltaic parallel in system, and the photovoltaic parallel in system includes many photovoltaics
Combining inverter, each the photovoltaic array of the direct current side joint independence of the photovoltaic combining inverter, AC are in parallel, and its feature exists
In the photovoltaic parallel in system also includes PID restraining devices；The PID restraining devices be connected to each it is described grid-connected inverse
Become between the grid entry point of device and the earth；
The photovoltaic combining inverter has dummy neutral device and gate-controlled switch, wherein：
The dummy neutral device is used to construct a dummy neutral for the photovoltaic combining inverter；
The PID restraining devices are used for dummy neutral voltage-to-ground described in lifting；
The gate-controlled switch is connected between the dummy neutral and negative busbar.
7. photovoltaic combining inverter according to claim 6, it is characterised in that the photovoltaic combining inverter is three-phase four
Line photovoltaic combining inverter, or, the photovoltaic combining inverter is three-phase three-wire system photovoltaic combining inverter.
8. a kind of photovoltaic combining inverter, is applied to photovoltaic parallel in system, and the photovoltaic parallel in system includes many photovoltaics
Combining inverter, each the photovoltaic array of the direct current side joint independence of the photovoltaic combining inverter, AC are in parallel, and its feature exists
In the photovoltaic parallel in system also includes PID restraining devices；The PID restraining devices be connected to each it is described grid-connected inverse
Become between the grid entry point of device and the earth, for the neutral point voltage-to-ground of each photovoltaic combining inverter of lifting；
The photovoltaic combining inverter has gate-controlled switch, wherein, the gate-controlled switch is connected to the neutral point and negative busbar
Between.
9. the photovoltaic combining inverter according to claim 6,7 or 8, it is characterised in that the gate-controlled switch is opened for machinery
Off and on closes pipe.
10. photovoltaic combining inverter according to claim 9, it is characterised in that the mechanical switch is relay；It is described
Switching tube is triode, MOSFET or IGBT.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116169868A (en) * | 2023-04-24 | 2023-05-26 | 浙江日风电气股份有限公司 | Group string type photovoltaic power station protection circuit, control method, device and medium thereof |
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