CN106961118A - Have the control device and control method of the suppression of PID effects and repair function concurrently - Google Patents
Have the control device and control method of the suppression of PID effects and repair function concurrently Download PDFInfo
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- CN106961118A CN106961118A CN201710180324.1A CN201710180324A CN106961118A CN 106961118 A CN106961118 A CN 106961118A CN 201710180324 A CN201710180324 A CN 201710180324A CN 106961118 A CN106961118 A CN 106961118A
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- 230000000694 effects Effects 0.000 title claims abstract description 45
- 230000008439 repair process Effects 0.000 title claims abstract description 37
- 230000001629 suppression Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 11
- 230000007935 neutral effect Effects 0.000 claims abstract description 16
- 238000002955 isolation Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 2
- 206010014357 Electric shock Diseases 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
Classifications
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- H02J3/383—
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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
The present invention relates to a kind of control device for having the suppression of PID effects and repair function concurrently, switched including several with the one-to-one sub-control of each road photovoltaic inversion system, one master control switch, the adjustable isolated voltage source of output voltage, one end of master control switch is connected with the neutral point of transformer, the other end of master control switch is connected with the positive output end of isolated voltage source, the negative output terminal connection protecting field of isolated voltage source, one end of each sub-control switch is connected with the output negative pole of the photovoltaic battery panel in the photovoltaic inversion system corresponding to it, the other end of each sub-control switch is connected with the positive output end of isolated voltage source.The control device also includes current-limiting resistance, current sensor, fuse.The problem of present invention can solve night back-pressure scheme high expensive and big electric shock risk simultaneously, and the electric shock risk that exchange neutral point lifting is brought, can preferably solve the problems, such as suppression and reparation to PID effects in photovoltaic parallel in system.
Description
Technical field
The present invention relates to a kind of with for suppressing PID effects in photovoltaic parallel in system and PID effects being repaired
Control device and control method.
Background technology
PID（Potential Induced Degradation）Effect, refers to that photovoltaic battery panel is chronically at height over the ground
Pressure, causes the phenomenon of photovoltaic battery panel hydraulic performance decline, and common situation is that negative high voltage effect is led over the ground for the negative pole of photovoltaic battery panel
Cause occur PID phenomenons.
Common PID Restrain measurements have following several：1st, night back-pressure, i.e. night by photovoltaic battery panel negative pole over the ground
One positive voltage, to repair the moment that works by day because the PID effects that the negative pressure of photovoltaic battery panel negative pole over the ground is produced, such as Germany
SMA companies PID BOX equipment.This scheme is repaired after can only occurring PID effects, and every inverter is with a reparation
Equipment cost is higher, and photovoltaic apparatus night is powered, can also increase the risk of personnel's error shock；2nd, photovoltaic battery panel negative pole is grounded,
By being grounded ensure that negative pressure is not present between photovoltaic battery panel negative pole and ground, suppress the generation of PID effects with this.But ground connection can increase
Plus the risk got an electric shock, and at the multi-machine parallel connection moment, can only there is an inverter ground, how otherwise can produce circulation over the ground
One inverter of selection ground connection is a problem, and common processing is artificially to choose an inverter ground, the ground connection inversion
Device will keep internal bus voltage to be higher than other inverters, so just can ensure that the negative poles of other inverters malleation over the ground, but this
Sample certainly will influence the transformation efficiency and Mppt that are grounded inverter to follow the trail of precision；3rd, the virtual lifting of AC neutral point, the program is led to
Cross lifting AC neutral point voltage-to-ground, indirect lifting photovoltaic battery panel negative pole voltage-to-ground, but in AC neutral point pair
Add a voltage source between ground, because the influence of system parasitic electric capacity, the leakage current that can be produced over the ground flows through, increase electric shock wind
Danger.
The content of the invention
It is an object of the invention to provide a kind of cost it is relatively low, have concurrently PID effects suppress and repair, reduction electric shock risk control
Device processed.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of control device for having the suppression of PID effects and repair function concurrently, it is described grid-connected applied in photovoltaic parallel in system
If system includes the change that main line photovoltaic inversion system and input side are connected with photovoltaic inversion system described in each road
Depressor, the outlet side of the transformer is connected with power network, and photovoltaic generating system includes photovoltaic battery panel and institute described in per road
State the DC/DC converters that photovoltaic battery panel is connected, the dc bus and the direct current that are connected with the DC/DC converters
The DC/AC inverters that bus is connected, it is described have concurrently PID effects suppress and repair function control device include several with it is each
The one-to-one sub-control switch of photovoltaic inversion system described in road, master control switch, the adjustable isolation voltage of output voltage
Source, one end of master control switch is connected with the neutral point of the transformer, the other end of the master control switch and it is described every
The positive output end in ionization voltage source is connected, the negative output terminal connection protecting field of the isolated voltage source, each sub-control switch
One end is connected with the output negative pole of the photovoltaic battery panel in the photovoltaic inversion system corresponding to it, each sub-control
The other end of switch is connected with the positive output end of the isolated voltage source.
It is preferred that, the control device for having the suppression of PID effects and repair function concurrently is also including being connected to the isolation electricity
Current-limiting resistance between the negative output terminal of potential source and the protecting field.
It is preferred that, it is described have concurrently PID effects suppress and repair function control device also include and the isolation resistance phase
The current sensor of series connection.
It is preferred that, it is described have concurrently PID effects suppress and repair function control device also include and the current-limiting resistance phase
The fuse of series connection.
It is preferred that, each sub-control switch and master control switch are telecommunication controlling switch, and each sub-control is opened
Close and the master control switchs and is connected to remote control its controller for being opened or closed.
The present invention also provides a kind of controlling party based on the above-mentioned control device for having the suppression of PID effects and repair function concurrently
Method, the control method is applied in photovoltaic parallel in system, described to have that PID effects suppress and the control method of repair function is concurrently：
The above-mentioned control device for having the suppression of PID effects and repair function concurrently is accessed in the photovoltaic parallel in system；When the photovoltaic simultaneously
After each DC/AC inverters work in net system, control disconnects each sub-control switch, closes the master control switch, adjusts
The output voltage of the isolated voltage source is saved, the output voltage of the isolated voltage source is first more than in the photovoltaic parallel in system
Dc bus midpoint to the voltage max of dc bus negative pole, then equal to the dc bus in the photovoltaic parallel in system
Midpoint to the voltage max of dc bus negative pole；When each DC/AC inverters in the photovoltaic parallel in system stop
After work, each sub-control of control closure switchs, disconnects the master control switch, and the output voltage for adjusting the isolated voltage source is big
In 0.
It is preferred that, the closed and disconnected switched by sub-control switch and the master control described in controller remote control.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：The present invention's has PID concurrently
Effect suppresses and the control device and its control method of repair function can solve night back-pressure scheme high expensive simultaneously with touching
The problem of risk is big, and the electric shock risk that exchange neutral point lifting is brought, can preferably solve photovoltaic parallel in system
In to the suppression of PID effects and repair problem, with preferable application prospect.
Brief description of the drawings
Accompanying drawing 1 is the photovoltaic parallel in system of the control device for having the suppression of PID effects and repair function concurrently of the application present invention
Schematic diagram.
Accompanying drawing 2 is the photovoltaic parallel in system of the control device for having the suppression of PID effects and repair function concurrently of the application present invention
Schematic diagram.
Accompanying drawing 3 is the flow diagram that leaked electricity in photovoltaic parallel in system.
Embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings.
Embodiment one：Referring to shown in accompanying drawing 1, if photovoltaic parallel in system includes main line（Y roads）Photovoltaic inversion in parallel
System and transformer.Each road photovoltaic inversion system includes light according to there is identical structure per road photovoltaic inversion system
Lie prostrate cell panel PV, DC/DC converter, dc bus and DC/AC inverters.Photovoltaic battery panel PV has two output ends --- and it is defeated
Go out positive pole Pv+ and the input of output negative pole Pv-, DC/DC converter is connected with photovoltaic battery panel PV two output ends, and
DC/DC converters also have two-way output end.Dc bus is connected with the output end of DC/DC converters, is then only connected to DC/DC
Between the two-way output end of converter, so as to respectively constitute dc bus positive pole Bus+ and dc bus negative pole Bus-.Direct current
Two electric capacity are serially connected with bus, the midpoint of two electric capacity constitutes the midpoint Mid of dc bus.Two of DC/AC inverters are defeated
Enter end with dc bus to be connected, i.e., connect dc bus positive pole Bus+ and dc bus negative pole Bus- respectively.Transformer it is defeated
Ru Ceyuge roads photovoltaic inversion system is connected, the three-phase of the DC/AC inverters in the photovoltaic inversion system of Ji Ge roads
The input side of transformer is accessed after exporting and connecing.Transformer input side includes the three-phase coil group using star connection, so that line
The common junction of circle group constitutes the neutral point N of transformer.The outlet side of transformer is connected to power network.
A kind of control device for having the suppression of PID effects and repair function concurrently being applied in above-mentioned photovoltaic parallel in system, bag
Include several sub-controls switch S1 ~ Sy, a master control switch Sn and isolated voltage source.In master control switch Sn one end and transformer
Property point N is connected, and the other end is connected with the positive output end of isolated voltage source.And the negative output terminal of isolated voltage source then connects guarantor
Shield ground PE.The quantity phase of sub-control switch S1 ~ Sy quantity and the photovoltaic inversion system included in the photovoltaic parallel in system
Together, and sub-control switch S1 ~ Sy and each road photovoltaic inversion system are corresponded.Each sub-control switch S1 ~ Sy one end difference
It is connected through diode D1 ~ Dy with the output negative pole Pv- of the photovoltaic battery panel PV in the photovoltaic inversion system corresponding to it
Connect, the other end is connected with the positive output end of isolated voltage source.The output voltage of isolated voltage source can adjust.
Have that PID effects suppress and the control method of control device of repair function is concurrently based on above-mentioned：First in photovoltaic simultaneously
The above-mentioned control device for having the suppression of PID effects and repair function concurrently is accessed in net system, then according to the work of each DC/AC inverters
Making state controls each sub-control switch S1 ~ Sy's and master control switch Sn state is opened or closed.Specially：
1st, during daytime, the work of DC/AC inverters conveys energy to power network.（1）After the work of DC/AC inverters, because phase three-wire three
Inverter operation principle processed, the neutral point N of transformer voltage and the dc bus mid-point voltage phase of DC/AC inverter internals
Together, now control disconnects each sub-control switch S1 ~ Sy, closure master control switch Sn, and the voltage that isolated voltage source is exported is added in transformation
Between the neutral point N to protecting field PE of device.The output voltage of isolated voltage source is adjusted, is more than the output voltage of isolated voltage source
Voltage max of the midpoint Mid of dc bus in photovoltaic parallel in system to dc bus negative pole Bus-.For example for 1000V
Photovoltaic parallel in system, the ceiling voltage of its dc bus is 1000V, therefore dc bus midpoint Mid to dc bus negative pole
Bus- voltage is up to 500V, i.e. Umidbus-≤500V, then the output voltage for adjusting isolated voltage source is more than 500V；（2）
The output voltage of isolated voltage source is adjusted again, makes the output voltage of isolated voltage source equal to the dc bus in photovoltaic parallel in system
Midpoint Mid to dc bus negative pole Bus- voltage max, i.e., equal to 500V, now the neutral point N of transformer is electric over the ground
Press as 500V, i.e. Unpe=500V；（3）Because the neutral point N current potentials of transformer are identical with the midpoint Mid current potentials of dc bus, then
The midpoint Mid voltage-to-grounds of dc bus are 500V, i.e. Umidpe=500V；（4）Because Umidbus-≤500V, and Umidpe=
500V, then voltage is more than or equal to 0, i.e. Ubus-pe >=0 between dc bus negative pole Bus- to protecting field PE；（5）Because of DC/AC
The negative pole of inverter internal dc bus and the photovoltaic battery panel PV of input output negative pole Pv-, which are joined directly together, to be connect, i.e. Upv-=
Ubus-, thus photovoltaic battery panel PV output negative pole Pv- to the voltage between protecting field PE be more than or equal to 0, i.e. Upv-pe >=
0.Photovoltaic battery panel PV negative output terminal malleation over the ground, that is, realize PID and suppress function.
In addition, this has concurrently, PID effects suppress and the control device of repair function also includes current-limiting resistance R, current-limiting resistance R
It is connected between the negative output terminal of isolated voltage source and protecting field PE.After isolated voltage source work, because photovoltaic battery panel PV's
The influence of parasitic capacitance, has leakage current by DC/AC inverters and the earth, as shown in Figure 3, can increase personnel's electric shock wind
Danger, therefore and set up above-mentioned current-limiting resistance R.Magnitude of voltage and safety that current-limiting resistance R resistance is exported according to isolated voltage source
Required value and determine, representative value can use 100k, in the case of 500V voltages, can limit electric current in below 5mA, it is ensured that personnel
Safety.Notify, in order to prevent that personnel's error shock can not be protected under current-limiting resistance R failure conditions, this have concurrently PID effects suppress and
The control device of repair function also sets up current sensor CT to detect the electric current flowed through, current sensor CT and isolation resistance
It is in series.When current sensor CT, which detects the electric current that flows through, is more than safety value, then the output of isolated voltage source is disconnected and total
Control switch Sn, cuts off drain current path, support personnel's safety.Further, this has PID effects concurrently and suppressed and repair function
Control device also includes fuse Fuse, and fuse Fuse is in series with current-limiting resistance R and handled as redundancy protecting, works as current-limiting resistance
In the case that R and current sensor CT fail, fuse Fuse fuses when electric current is excessive, protects personal security.
2nd, during night, photovoltaic battery panel PV is stopped without electricity, DC/AC inverters.1. now control closes each sub-control
Switch S1 ~ Sy, disconnect master control switch Sn, then all photovoltaic battery panel PV output negative pole Pv- has been connected to isolated voltage source
Positive output end；2. because photovoltaic battery panel PV output negative pole Pv- connects the positive output end of isolated voltage source, photovoltaic battery panel PV's is defeated
Go out the output voltage that negative pole Pv- voltage-to-grounds are equal to isolated voltage source, i.e. Upv-pe=U；3. the output of regulation isolated voltage source is electric
Pressure U is larger than 0, and output voltage U can occur PID degree difference and adjust according to photovoltaic battery panel PV；4. now institute
Some photovoltaic battery panel PV output negative pole Pv- voltage-to-grounds are equal to the output voltage of isolated voltage source, i.e. Upv-pe=U ＞
0, that is, night back-pressure function is realized, has occurred and that the photovoltaic battery panel PV of PID effects can play repair for those.This
When, it is only necessary to there is a control device that the night back-pressure function of all DC/AC inverters can be achieved.And foregoing current limliting electricity
Resistance R, current sensor CT and fuse Fuse can function well as leakage protection, effectively reduction personnel's false touch risk.
Therefore, compared to scheme of the existing inverter with a prosthetic appliance, the cost of this programme is lower, security and reliability
Property is all greatly improved.
, can be by transformer input side when the transformer input side in photovoltaic parallel in system does not use star connection
Access the capacitance group of star connection and produce the neutral point N of a virtual transformer, i.e., by the public affairs of the capacitance group of star connection
Contact constitutes the neutral point N of virtual transformer altogether, as shown in Figure 2.Now, the neutral point of the virtual transformer of lifting is passed through
N voltage, can play and suppress with the star connection transformer identical PID shown in accompanying drawing 1 and repairing effect.
In such scheme, each sub-control switch S1 ~ Sy and master control switch Sn can use telecommunication controlling switch, each sub-control
Switch S1 ~ Sy and master control switch Sn are connected to remote control its controller for being opened or closed, so as to be come far by controller
Process control sub-control switchs S1 ~ Sy and master control switchs Sn closed and disconnected.Now, current sensor CT can also be detected
Current signal feeds back to controller, isolated voltage source is connected into controller so that when electric current is excessive, controller can be timely
Control disconnects master control switch Sn and disconnects the output of isolated voltage source.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (7)
1. a kind of control device for having the suppression of PID effects and repair function concurrently, applied in photovoltaic parallel in system, the photovoltaic is simultaneously
If net system is connected including main line photovoltaic inversion system and input side with photovoltaic inversion system described in each road
Transformer, the outlet side of the transformer is connected with power network, include per photovoltaic generating system described in road photovoltaic battery panel, with
DC/DC converters that the photovoltaic battery panel is connected, the dc bus being connected with the DC/DC converters, with it is described straight
The DC/AC inverters that stream bus is connected, it is characterised in that：The control device for having the suppression of PID effects and repair function concurrently
Including several and the one-to-one sub-control of photovoltaic inversion system described in each road switch, master control switch, an output voltage
Adjustable isolated voltage source, one end of the master control switch is connected with the neutral point of the transformer, the master control switch
The other end is connected with the positive output end of the isolated voltage source, the negative output terminal connection protecting field of the isolated voltage source, respectively
One end of the sub-control switch and the output negative pole phase of the photovoltaic battery panel in the photovoltaic inversion system corresponding to it
Connection, the other end of each sub-control switch is connected with the positive output end of the isolated voltage source.
2. the control device according to claim 1 for having the suppression of PID effects and repair function concurrently, it is characterised in that：It is described
Have concurrently PID effects suppress and repair function control device also include being connected to the negative output terminal of the isolated voltage source with it is described
Current-limiting resistance between protecting field.
3. the control device according to claim 2 for having the suppression of PID effects and repair function concurrently, it is characterised in that：It is described
Having the control device of the suppression of PID effects and repair function concurrently also includes the current sensor being in series with the isolation resistance.
4. the control device according to claim 3 for having the suppression of PID effects and repair function concurrently, it is characterised in that：It is described
Having the control device of the suppression of PID effects and repair function concurrently also includes the fuse being in series with the current-limiting resistance.
5. the control device according to any one of claim 1 to 4 for having the suppression of PID effects and repair function concurrently, it is special
Levy and be：Each sub-control switch and master control switch are telecommunication controlling switch, and each sub-control is switched and described
Master control switch is connected to remote control its controller for being opened or closed.
6. a kind of control method for having the suppression of PID effects and repair function concurrently, applied in photovoltaic parallel in system, its feature exists
In：It is described to have that PID effects suppress and the control method of repair function is concurrently：Access such as right will in the photovoltaic parallel in system
Seek the control device for having the suppression of PID effects and repair function concurrently any one of 1 to 5；When in the photovoltaic parallel in system
Each DC/AC inverters work after, control disconnects each sub-control switch, closes the master control switch, regulation it is described every
The output voltage in ionization voltage source, the direct current for making the output voltage of the isolated voltage source first be more than in the photovoltaic parallel in system is female
The midpoint of line is to the voltage max of dc bus negative pole, then equal to the midpoint pair of the dc bus in the photovoltaic parallel in system
The voltage max of dc bus negative pole；After each DC/AC inverters in the photovoltaic parallel in system are stopped, control
Each sub-control of system closure switchs, disconnects the master control switch, and the output voltage for adjusting the isolated voltage source is more than 0.
7. the control method according to claim 6 for having the suppression of PID effects and repair function concurrently, it is characterised in that：Pass through
The closed and disconnected that sub-control switch and the master control described in controller remote control are switched.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710180324.1A CN106961118A (en) | 2017-03-24 | 2017-03-24 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
| PCT/CN2018/080348 WO2018171765A1 (en) | 2017-03-24 | 2018-03-23 | Control device and control method having both pid effect suppression and reparation functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710180324.1A CN106961118A (en) | 2017-03-24 | 2017-03-24 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
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| CN106961118A true CN106961118A (en) | 2017-07-18 |
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| CN201710180324.1A Pending CN106961118A (en) | 2017-03-24 | 2017-03-24 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
Country Status (2)
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| CN (1) | CN106961118A (en) |
| WO (1) | WO2018171765A1 (en) |
Cited By (10)
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| CN107453703A (en) * | 2017-08-16 | 2017-12-08 | 上海质卫环保科技有限公司 | A kind of solar cell PID recovers and prevention component |
| CN107493057A (en) * | 2017-09-22 | 2017-12-19 | 北京铂阳顶荣光伏科技有限公司 | The electric regulating system and method for a kind of potential induction attenuation of photovoltaic generation |
| CN107492905A (en) * | 2017-08-22 | 2017-12-19 | 上能电气股份有限公司 | A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device |
| CN107492907A (en) * | 2017-08-29 | 2017-12-19 | 武汉协鑫新能源电力设计有限公司 | A kind of control device and its control method with PID suppression and repair function |
| CN108306335A (en) * | 2018-03-02 | 2018-07-20 | 阳光电源股份有限公司 | Photovoltaic generating system, inverter and its be incorporated into the power networks control method and device |
| WO2018171765A1 (en) * | 2017-03-24 | 2018-09-27 | 江苏固德威电源科技股份有限公司 | Control device and control method having both pid effect suppression and reparation functions |
| EP3567692A1 (en) * | 2018-05-10 | 2019-11-13 | Solaredge Technologies Ltd. | Systems and methods to increase the reliability and the service life time of photovoltaic (pv) modules |
| CN113687128A (en) * | 2021-09-08 | 2021-11-23 | 阳光电源股份有限公司 | Current detection method, device and equipment of photovoltaic PID suppression circuit |
| US11258261B2 (en) | 2018-05-10 | 2022-02-22 | Solaredge Technologies Ltd. | Systems and methods to increase the reliability and the service life time of photovoltaic (PV) modules |
| WO2022126351A1 (en) * | 2020-12-15 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system, protection method, and inverter system |
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| WO2018171765A1 (en) * | 2017-03-24 | 2018-09-27 | 江苏固德威电源科技股份有限公司 | Control device and control method having both pid effect suppression and reparation functions |
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| EP3567692A1 (en) * | 2018-05-10 | 2019-11-13 | Solaredge Technologies Ltd. | Systems and methods to increase the reliability and the service life time of photovoltaic (pv) modules |
| WO2022126351A1 (en) * | 2020-12-15 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system, protection method, and inverter system |
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