CN107492907A - A kind of control device and its control method with PID suppression and repair function - Google Patents
A kind of control device and its control method with PID suppression and repair function Download PDFInfo
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- CN107492907A CN107492907A CN201710753978.9A CN201710753978A CN107492907A CN 107492907 A CN107492907 A CN 107492907A CN 201710753978 A CN201710753978 A CN 201710753978A CN 107492907 A CN107492907 A CN 107492907A
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- 230000008439 repair process Effects 0.000 title claims abstract description 32
- 230000001629 suppression Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 23
- 230000005611 electricity Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 4
- 238000003491 array Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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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
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- 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
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Abstract
The invention discloses a kind of control device and its control method with PID suppression and repair function, it is characterised in that：Control device includes controller, adjustable dc voltage AC/DC power supplys, diode D, current-limiting resistance R, voltage sensor VT1 and voltage sensor VT2；Switch K1 is concatenated between the output negative pole and the current-limiting resistance R of first via photovoltaic array, the described one end of switch K1 away from first via photovoltaic array output negative pole is connected by switching K2 Kn with the output negative pole of the 2nd to the n-th road photovoltaic array respectively；By a control device, the photovoltaic module of the generations PID effects in all photovoltaic arrays can be repaired and suppressed the present invention, and automatic switchover, simple in construction, cost is low；The electric capacity or resistance of star connection need not additionally be increased, do not increase the trouble point of system, have a extensive future.
Description
Technical field
The present invention relates to field of photovoltaic power generation, and in particular to it is a kind of with PID suppress and repair function control device and
Its control method.
Background technology
PID (the potential potential induction attenuations of Potential Induced Degradation) effect, refers to photovoltaic battery panel
(being also photovoltaic module) is for a long time under high pressure effect so that leakage current, substantial amounts of accumulation between glass, encapsulating material be present
In battery surface, allow battery surface to be passivated, cause the phenomenon of photovoltaic battery panel hydraulic performance decline, common situation is photovoltaic battery panel
Negative pole high pressure effect cause occur PID phenomenons.
At present, the scheme of the anti-PID effects of photovoltaic system, which is divided into, is broadly divided into two classes：One kind is online anti-PID schemes, i.e.,
Restraining device works simultaneously with photovoltaic module, suppresses the generation of photovoltaic module PID effects；Another kind is off-line type, i.e., in photovoltaic
When component is idle, impaired photovoltaic module is repaired.
Online anti-PID schemes, can not be repaired, off-line type can be repaiied to having there is the photovoltaic module of PID effects
Impaired photovoltaic module again, but the generation of PID effects can not be suppressed, if two kinds of anti-PID schemes use simultaneously, cost is high, needs
Increase extra means are operated pattern switching, complicated.
In prior art document, Patent No. 201710180324.1, patent name is：PID effects are had concurrently to suppress and repair
The control device and control method of function again, although same have suppression and repair function, exchange is lifted because it passes through
The method of side neutral point potential realizes that negative pole above earth potential is more than or equal to 0 indirectly, otherwise this requires that exchanging side transformer adopts
With star connection, the extra electric capacity for increasing star connection or resistance is needed to play for the transformer for not using star connection
The neutral point N of virtual transformer effect, which increase the trouble point of cost and system, scheme of the present invention avoids
This problem.
The content of the invention
To solve deficiency of the prior art, the present invention provides a kind of control device with PID suppression and repair function
And its control method, the anti-PID schemes online that solve can not repair caused PID effects, offline recovery scenario can not press down again
The generation problem of PID effects processed, and do not increase the trouble point of system.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：It is a kind of that there is PID suppression and the control of repair function
Device processed, applied to photovoltaic parallel in system, photovoltaic parallel in system includes 1-n roads photovoltaic inversion system, with being sent out per road photovoltaic
The connected transformer of the output end of electric inversion system and the power network being connected with transformer, are wrapped per road photovoltaic inversion system
Include the photovoltaic array and inverter of interconnection, it is characterised in that：Control device includes controller, adjustable dc voltage AC/DC
Power supply, diode D, current-limiting resistance R, voltage sensor VT1 and voltage sensor VT2；The three-phase input end of the AC/DC power supplys
Connect the three-phase output end of photovoltaic combining inverter；The DC output end positive pole DC+ of the AC/DC power supplys connects through current-limiting resistance R
It is connected on the output negative pole PV- of photovoltaic array, DC output end negative pole DC- the ground connection PE, the AC/DC of the AC/DC power supplys
The control terminal of power supply is connected with the controller, and the AC/DC power supplys provide power supply for controller；
The positive pole of the diode D is connected with the DC output end negative pole DC- of the AC/DC power supplys, the diode D's
Negative pole is connected with the DC output end positive pole DC+ of the AC/DC power supplys；
The output cathode of the voltage sensor VT1 electrode input ends connection photovoltaic array, negative input ground connection PE；Electricity
The output negative pole of pressure sensor VT2 electrode input end connection photovoltaic array, negative input ground connection PE；Voltage sensor VT1
Controller is connected respectively with voltage sensor VT2 output end, for detecting current photovoltaic array output cathode PV+ and negative electricity
Press PV- PE voltages over the ground；
It is remote that switch K1, the switch K1 are concatenated between the output negative pole and the current-limiting resistance R of first via photovoltaic array
From first via photovoltaic array output negative pole one end respectively by switching K2-Kn and the 2nd to the n-th road photovoltaic array output negative pole
Connection, described switch K1, K2 are inspection switch to Kn, and when control device normal work, all switches close, when needs pair
It is all to switch off when control device is overhauled.
A kind of foregoing control device with PID suppression and repair function, it is characterized in that：The controller passes through wireless
Communication interface remote control switch K1-Kn break-make.
A kind of foregoing control device with PID suppression and repair function, it is characterized in that：The switch K1-Kn is to connect
Tentaculum or relay.
A kind of foregoing control device with PID suppression and repair function, it is characterized in that：The control device also includes
The current sensor CT and relay K, the current sensor CT and relay K and current-limiting resistance being respectively connected with controller
R is connected in series.
A kind of foregoing control device with PID suppression and repair function, it is characterized in that：The control device also includes
Fuse F, the fuse F and current-limiting resistance R are connected in series.
A kind of foregoing control device with PID suppression and repair function, it is characterized in that：The control device also includes
The GPS module being connected with controller, in real time to controller transmission time information.
A kind of foregoing control device with PID suppression and repair function, it is characterized in that：The controller is STM32
Microprocessor.
A kind of control method with PID suppression and repair function, it is characterized in that：Including step：
1) when photovoltaic parallel in system normal work, controller controls all switch K1-Kn closures, according to voltage sensor
VT1 and VT2 detects that PE voltages are PV+ and PV- over the ground for first via photovoltaic array output cathode and negative pole, when PV+ is less than protection
During value, control device normal work, step 2) is gone to, otherwise, disconnect all switch K1-Kn, overhauled；
2) output voltage of the AC/DC power supplys of controller control adjustable dc voltage so that first via photovoltaic array exports
Negative pole PE voltage >=0, and then PE voltage >=0 over the ground per road photovoltaic array output negative pole over the ground；
3) when detecting photovoltaic array output negative pole PE voltages being less than 0 over the ground, controller control adjustable dc voltage
The output voltage of AC/DC power supplys so that PE voltage >=0, suppression PID phenomenons produce photovoltaic array output negative pole over the ground；
If 4) detect that the voltage between photovoltaic array PV+ and PV- is continuously 0 by voltage sensor VT1 and VT2,
The output voltage that the AC/DC power supplys of adjustable dc voltage are adjusted by controller is more than 0, i.e., between photovoltaic array negative pole and PE
A forward voltage is obtained, repairs the photovoltaic module that PID effects have occurred.
A kind of foregoing control method with PID suppression and repair function, it is characterized in that：Control device is according to GPS moulds
The temporal information that block is sent automatically switches and is suppressed or repair PID effects.
The beneficial effect that the present invention is reached：
1) by a control device P-BOX, the photovoltaic group of the generation PID effects in all photovoltaic arrays (1,2 ... n)
Part can be repaired and suppressed, simple in construction, and cost is low；
2) control device mode of operation detects photovoltaic array output end by voltage sensor VT1 and VT2 and GSP module
Positive and negative pole tension and gps clock carry out PID reparations or suppress automatically switch, reduce system cost；
3) present invention is simple in construction, and cost is low, it is not necessary to the electric capacity or resistance of extra increase star connection, does not increase
The trouble point of system, has a extensive future.
Brief description of the drawings
Fig. 1 is this control device and photovoltaic parallel in system attachment structure schematic diagram；
Fig. 2 is the concrete structure schematic diagram of this control device.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, photovoltaic parallel in system includes n roads photovoltaic inversion system and per road photovoltaic inversion system
The connected transformer of output end and the power network being connected with transformer, per road photovoltaic inversion system including being sequentially connected
Photovoltaic array, inverter, photovoltaic array PV output cathode is PV+, output negative pole PV-.P-BOX in figure is this hair
Bright control device.
As shown in Fig. 2 a kind of be applied to have PID suppression and the control of repair function dress in above-mentioned photovoltaic parallel in system
Put, including the AC/DC power supplys of controller, adjustable dc voltage, diode D, current-limiting resistance R, voltage sensor VT1 and voltage pass
Sensor VT2；
The three-phase output end of the three-phase input end connection inverter of the AC/DC power supplys of adjustable dc voltage or the three of transformer
Phase input；The DC output end positive pole DC+ of AC/DC power supplys is connected to the output negative pole PV- of photovoltaic array through current-limiting resistance R
On, the DC output end negative pole DC- ground connection PE of AC/DC power supplys, the control terminal of AC/DC power supplys is connected with controller；Adjustable DC
The AC/DC power supplys of voltage provide power supply for controller, it is possible to provide all the way 24V direct current outputs to controller as power supply.
The effect of current-limiting resistance be in order to prevent the output negative pole of photovoltaic array to be directly grounded, when photovoltaic array output just
During the ground short circuit failure of pole, current-limiting resistance can play limitation positive pole and be acted on to negative pole leakage current, prevent personnel's electric shock risk.Resistance
Value size is no more than 30mA (NB/T according to the highest DC voltage between photovoltaic array both positive and negative polarity and both positive and negative polarity Ground leakage current
Safety requirement in 32004-2013) limitation determine that the highest that the present embodiment is exported with photovoltaic array between both positive and negative polarity is straight
Exemplified by flowing voltage 1500V, current-limiting resistance resistance size should be not less than 1500V/30mA=50k Ω.
Diode D positive pole is connected with the DC output end negative pole DC- of AC/DC power supplys, diode D negative pole and AC/DC
The DC output end positive pole DC+ connections of power supply, can by diode D when the output cathode ground short circuit failure of photovoltaic array
Damaged with avoiding the output of AC/DC power supplys from bearing backward voltage.In the present embodiment, diode reverse pressure voltage should be not less than
1000VDC, for safety, it can use diode reverse pressure voltage 1200VDC.
Voltage sensor VT1 electrode input ends connect the output cathode of photovoltaic array, negative input ground connection PE；Voltage passes
The output negative pole of sensor VT2 electrode input end connection photovoltaic array, negative input ground connection PE；Voltage sensor VT1 and electricity
Pressure sensor VT2 output end connects controller respectively, for detecting current photovoltaic array output cathode PV+ and negative pole respectively
PV- should be not less than photovoltaic array output cathode PV+ to PE or photovoltaic battle array to PE voltage, the voltage range scope of voltage sensor
Row output negative pole PV- to PE maximum voltage, it is contemplated that the possibility of positive pole shorted to earth failure, the range of voltage sensor occur
The ceiling voltage that should be not less than between photovoltaic array both positive and negative polarity, for direct current 1500V systems, voltage sensor range ability should
+ 1500VDC is arrived in -1500VDC, considers that safety and measurement accuracy, range ability can use ± 2000VDC.
Switch K1 is concatenated between the output negative pole and current-limiting resistance R of first via photovoltaic array, switch K1 is away from the first via
One end of the output negative pole of photovoltaic array is respectively by switching K2 ..., and Kn is connected with the output negative pole of the 2nd to the n-th road photovoltaic array,
It is inspection switch to switch K1, K2 ... Kn, and when P-BOX normal works, all switches close, and so, passes through a control
The photovoltaic module of generation PID effects in all photovoltaic arrays of device P-BOX (1,2 ... n) can be repaired and suppressed；
It is all to switch off when needing to overhaul P-BOX, to play a part of protecting the job safety of maintainer.Switch
K1-Kn provides make-and-break signal control by the wireless communication interface of the controller in P-BOX control devices.K1-Kn is switched as tool
There are the contactor or relay of wireless communication interface.
Control device also includes the GPS module being connected with controller, in real time to controller transmission time information.
In addition, the control device also includes the current sensor CT and relay K being respectively connected with controller, electric current passes
Sensor CT and relay K and current-limiting resistance R is connected in series, and is connected between diode D and protecting field PE, controller passes through electric current
Sensor CT monitors the electric current of photovoltaic array output negative pole over the ground in real time, when higher than setting value or when there is instantaneous large-current,
Controller sends control signal disjunction relay K, to cut off negative pole ground connection, protection staff safety rapidly.The electric current of CT sensors
Measurement range should be higher than that 30mA, but unsuitable excessive, in order to avoid influence measurement accuracy.Relay K is HVDC relay, and its is pressure-resistant
Value should be not less than the half of photovoltaic array both positive and negative polarity maximum voltage, i.e. 750VDC considers safety allowance, and pressure voltage can use
1000VDC。
Further, the device also includes fuse F, is connected in series with current-limiting resistance R, when current sensor CT and relay
When device K fails, when electric current is excessive, fuse F fuse failures, protection staff safety.Fuse F protective current should be set in
It is failure to actuate within 30mA, is disconnected sharply above more than 30mA.
Controller is STM32 microprocessors, is specifically as follows STM32F103R8T6 microprocessors.
The AC/DC power supplys output DC voltage size of adjustable dc voltage is 0-1000V.
A kind of control method with PID suppression and repair function：
1) time is learnt when photovoltaic parallel in system normal work (being operated in the pattern of generating electricity by way of merging two or more grid systems) or by GPS module
For daytime (working time of setting), controller controls all switch K1-Kn closures, detected according to voltage sensor VT1 and VT2
To first via photovoltaic array output cathode and negative pole, PE voltages are PV+ and PV- over the ground, and when PV+ is less than protection value, (protection value is
The output ceiling voltage of photovoltaic array), control device normal work, step 2) is gone to, otherwise, disconnect all switch K1-Kn, enter
Row maintenance；
2) output voltage of the AC/DC power supplys of controller control adjustable dc voltage so that first via photovoltaic array exports
Negative pole PE voltage >=0 over the ground, because all photovoltaic array output negative pole current potentials are identical, Ji Mei roads photovoltaic array output negative pole is over the ground
PE voltage >=0；
3) because the earth impedance of photovoltaic array there may be change, cause the voltage on current-limiting resistance R to change, enter
And influence voltage swings of the PV- to PE, when detect photovoltaic array output negative pole over the ground PE voltages be less than 0 when, controller control
The output voltage of the AC/DC power supplys of adjustable dc voltage so that first via photovoltaic array output negative pole PE voltage >=0 over the ground, suppression
PID phenomenons processed produce；
If 4) detect that the voltage between the first via photovoltaic array PV+ and PV- continues by voltage sensor VT1 and VT2
For 0 when (typically continue 10 minutes photovoltaic parallel in system indicated above to be stopped), or learn that the time is night by GPS module
Late (off-air time of setting), because now photovoltaic array output voltage is 0, it need to only be sent out by the controller in P-BOX
Go out regulated voltage signal, the output voltage for adjusting the AC/DC power supplys of adjustable dc voltage is more than 0, you can between negative pole and PE
A forward voltage is obtained, is connected to due to PE and photovoltaic array frame, that is, is equal to the negative pole in photovoltaic array and side
A forward voltage is added between frame, this is with causing the voltage direction of photovoltaic array PID effects on the contrary, occurring according to photovoltaic module
The degree of PID effects different (the decline degree of the terminal voltage of photovoltaic array is measured according to VT1 and VT2 (with component normal condition
Under output voltage compare), so as to judge the PID effects degree of photovoltaic module), by the output for suitably adjusting AC/DC power supplys
Magnitude of voltage, the photovoltaic module that PID effects have occurred can be repaired.
The present invention is simple in construction, and cost is low, it is not necessary to the electric capacity or resistance of extra increase star connection, does not increase and is
The trouble point of system, has a extensive future.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of control device with PID suppression and repair function, applied to photovoltaic parallel in system, photovoltaic parallel in system includes
1-n roads photovoltaic inversion system, the transformer and and transformer being connected with per the output end of road photovoltaic inversion system
Connected power network, the photovoltaic array and inverter being connected with each other are included per road photovoltaic inversion system, it is characterised in that：Control
Device processed includes controller, adjustable dc voltage AC/DC power supplys, diode D, current-limiting resistance R, voltage sensor VT1 and voltage
Sensor VT2；The three-phase output end of the three-phase input end connection photovoltaic combining inverter of the AC/DC power supplys；The AC/DC electricity
The DC output end positive pole DC+ in source is connected on the output negative pole PV- of photovoltaic array through current-limiting resistance R, the AC/DC power supplys
DC output end negative pole DC- is grounded PE, and the control terminal of the AC/DC power supplys is connected with the controller, and the AC/DC power supplys are
Controller provides power supply；
The positive pole of the diode D is connected with the DC output end negative pole DC- of the AC/DC power supplys, the negative pole of the diode D
It is connected with the DC output end positive pole DC+ of the AC/DC power supplys；
The output cathode of the voltage sensor VT1 electrode input ends connection photovoltaic array, negative input ground connection PE；Voltage passes
The output negative pole of sensor VT2 electrode input end connection photovoltaic array, negative input ground connection PE；Voltage sensor VT1 and electricity
Pressure sensor VT2 output end connects controller respectively, for detecting current photovoltaic array output cathode PV+ and cathode voltage
PV- PE voltages over the ground；
Switch K1, the switch K1 are concatenated between the output negative pole and the current-limiting resistance R of first via photovoltaic array away from the
One end of photovoltaic array output negative pole is connected by switching K2-Kn and the 2nd to the n-th road photovoltaic array output negative pole respectively all the way
Connect, described switch K1, K2 are inspection switch to Kn, and when control device normal work, all switches close, when needs are to control
It is all to switch off when device processed is overhauled.
2. a kind of control device with PID suppression and repair function according to claim 1, it is characterized in that：The control
The break-make that device processed passes through wireless communication interface remote control switch K1-Kn.
3. a kind of control device with PID suppression and repair function according to claim 1, it is characterized in that：It is described to open
It is contactor or relay to close K1-Kn.
4. a kind of control device with PID suppression and repair function according to claim 1, it is characterized in that：The control
Device processed also includes current sensor CT and relay K, the current sensor CT and the relay being respectively connected with controller
Device K is connected in series with current-limiting resistance R.
5. a kind of control device with PID suppression and repair function according to claim 1, it is characterized in that：The control
Device processed is also connected in series including fuse F, the fuse F and current-limiting resistance R.
6. a kind of control device with PID suppression and repair function according to claim 1, it is characterized in that：The control
Device processed also includes the GPS module being connected with controller, in real time to controller transmission time information.
7. a kind of control device with PID suppression and repair function according to claim 1, it is characterized in that：The control
Device processed is STM32 microprocessors.
8. a kind of control method with PID suppression and repair function, it is characterized in that：Including step：
1) when photovoltaic parallel in system normal work, controller controls all switch K1-Kn closures, according to voltage sensor VT1 with
VT2 detects that PE voltages are PV+ and PV- over the ground for first via photovoltaic array output cathode and negative pole, when PV+ is less than protection value,
Control device normal work, step 2) is gone to, otherwise, disconnect all switch K1-Kn, overhauled；
2) output voltage of the AC/DC power supplys of controller control adjustable dc voltage so that first via photovoltaic array output negative pole
PE voltage >=0 over the ground, and then PE voltage >=0 over the ground per road photovoltaic array output negative pole；
3) when detect photovoltaic array output negative pole over the ground PE voltages be less than 0 when, controller control adjustable dc voltage AC/DC
The output voltage of power supply so that PE voltage >=0, suppression PID phenomenons produce photovoltaic array output negative pole over the ground；
If 4) detect that the voltage between photovoltaic array PV+ and PV- is continuously 0 by voltage sensor VT1 and VT2, pass through
The output voltage of the AC/DC power supplys of controller regulation adjustable dc voltage is more than 0, i.e., is obtained between photovoltaic array negative pole and PE
One forward voltage, repair the photovoltaic module that PID effects have occurred.
9. a kind of control method with PID suppression and repair function according to claim 8, it is characterized in that：Control dress
The temporal information automatic switchover sent according to GPS module is put to be suppressed or repair PID effects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710753978.9A CN107492907B (en) | 2017-08-29 | 2017-08-29 | Control device with PID (proportion integration differentiation) inhibition and restoration functions and control method thereof |
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|---|---|---|---|
| CN201710753978.9A CN107492907B (en) | 2017-08-29 | 2017-08-29 | Control device with PID (proportion integration differentiation) inhibition and restoration functions and control method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108011583A (en) * | 2017-12-27 | 2018-05-08 | 阳光电源股份有限公司 | A kind of device of suppression PID effects |
| CN110474359A (en) * | 2018-05-10 | 2019-11-19 | 太阳能安吉科技有限公司 | Increase the system and method for the reliability and service life of photovoltaic (PV) module |
| CN110635767A (en) * | 2019-09-25 | 2019-12-31 | 沈阳新智恒新能源科技有限公司 | Photovoltaic system and method for inhibiting potential attenuation and monitoring insulation |
| WO2020144696A1 (en) * | 2019-01-13 | 2020-07-16 | Vigdu V Technologies Ltd | A dc-shift method and device for reducing potential-induced degradation (pid) |
| CN112152260A (en) * | 2020-09-17 | 2020-12-29 | 科华恒盛股份有限公司 | Photovoltaic power generation system PID effect repairing and inhibiting device |
| CN116207789A (en) * | 2023-05-06 | 2023-06-02 | 锦浪科技股份有限公司 | PID effect suppression method based on zero sequence |
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| CN116207789A (en) * | 2023-05-06 | 2023-06-02 | 锦浪科技股份有限公司 | PID effect suppression method based on zero sequence |
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