CN104467651A - Topological structure for preventing photovoltaic array PID - Google Patents
Topological structure for preventing photovoltaic array PID Download PDFInfo
- Publication number
- CN104467651A CN104467651A CN201410425125.9A CN201410425125A CN104467651A CN 104467651 A CN104467651 A CN 104467651A CN 201410425125 A CN201410425125 A CN 201410425125A CN 104467651 A CN104467651 A CN 104467651A
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- output
- photovoltaic array
- circuit breaker
- pole circuit
- switching terminal
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- 230000009885 systemic effect Effects 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
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- Photovoltaic Devices (AREA)
Abstract
The invention discloses a topological structure for preventing photovoltaic array PID. The structure comprises two quadrupole circuit breakers used for connecting and disconnecting voltage output of a photovoltaic array, a grounding system and a wire outgoing side. Four pile heads L1, L3, L5 and L7 correspond to one set of A+ and A-, and one set of B+ and B- output from a direct-current cabinet respectively, the L2 of the QF1 and the L6 of the QF2 are connected to serve as +Ud output, and the L8 of the QF1 is connected with the L4 of the QF2 to serve as -Ud output; the L4 and the L6 of the QF1 are connected with the L2 and the L8 of the QFQ2 respectively to serve as 0 V output, and the L4 and the L6 of the QF1 and the L2 and the L8 of the QFQ2 are connected with the grounding system. Due to the topological structure suitable for a bipolar system to prevent the photovoltaic array PID, the voltage to ground of the output end of the photovoltaic array can be manually and automatically switched, the PID phenomenon of the photovoltaic array can be effectively relieved, the service life of the photovoltaic array is prolonged, the utilization rate of the photovoltaic array is increased, and safety performance and effectiveness of a photovoltaic power station are improved.
Description
Technical field
The present invention relates to photovoltaic module anti-PID decay field, particularly a kind of topological structure preventing and treating photovoltaic array PID.
Background technology
When photovoltaic module normally uses, there is positive voltage or over the ground negative voltage over the ground in system, cause assembly surface charge buildup and cause power attenuation, in the short time, as occurred some months or one or two years, assembly power output sharply reduces phenomenon; For the PID phenomenon that photovoltaic array is exclusive, at battery surface or one deck silica dioxide coating with holes between passivation layer and battery, can be added, form a turning circuit and prevent harmful polarization, but this method increase battery manufacture cost and reduce the efficiency of battery to a certain extent;
Simultaneously, also can use the inverter of assembly voltage to earth or use plus earth module and band isolating transformer in resistance change system, but this method makes the use of photovoltaic module there is limitation, and band isolating transformer falls and both adds cost and also reduce system effectiveness.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of topological structure preventing and treating photovoltaic array PID is provided, voltage to earth that is artificial, automatic switchover photovoltaic array output can be realized, effective alleviation photovoltaic module PID phenomenon, improve useful life and the utilance of photovoltaic module, improve fail safe and the benefit of photovoltaic plant.
In order to solve above technical problem, the invention provides the topological structure of a kind of control photovoltaic array PID that unites, A+, A-, B+ and B-that four corresponding two groups of DC cabinets of pile crown L1, L3, L5 and L7 difference export; Outgoing line side, the L6 of L2 and the QF2 of the QF1 conduct+Ud that is connected exports, and the L4 of L8 and the QF2 of the QF1 conduct-Ud that is connected exports; The L4 of QF1, L2, L8 of L6 and QFQ2 are connected between two as 0V output and are connected with grounding system; Two circuit breakers (isolating switch) have any time and only have one to close, between realize interlocking by mechanical mutual lock shaft, Manual structure is without secondary power supply and feedback node;
By both positive and negative polarity short circuit and ground connection during array no-voltage at night, regularly by reverse for photovoltaic array output port current potential;
In first four-pole circuit breaker in the first output switching terminal and the second four-pole circuit breaker the 3rd output switching terminal jointly as positive direct-current output, in first four-pole circuit breaker, in second, third output switching terminal and the second four-pole circuit breaker, the first, the 4th output switching terminal is jointly by grounding system ground connection, and in the first four-pole circuit breaker, the 4th output switching terminal is common as bearing DC output end with second switch output in the second four-pole circuit breaker.
Further, the topological structure of aforesaid control photovoltaic array PID, the switch of described four-pole circuit breaker is isolating switch or on-load switch.
The invention has the beneficial effects as follows:
The present invention is exclusively used in suppression and the recovery of the photovoltaic array PID (current potential brings out decay) of bipolarity direct current photovoltaic system, improves fail safe and the utilance of photovoltaic system; Voltage to earth that is artificial, automatic switchover photovoltaic array output can be realized, effectively alleviate photovoltaic module PID phenomenon, improve useful life and the utilance of photovoltaic module, improve fail safe and the benefit of photovoltaic plant;
This invention compensate for the blank of needleless to the PID restore circuit of bipolarity direct current photovoltaic system, switch in short-circuit device circuit breaker is wherein isolating switch or on-load switch, can not fuse be needed, reduce photovoltaic plant input cost, be conducive to the increase of the long-term gain in power station.
Accompanying drawing explanation
Fig. 1 is both positive and negative polarity connection layout when daytime, array had voltage;
Both positive and negative polarity ground connection figure when Fig. 1-1 is array no-voltage at night;
Fig. 2 is photovoltaic array series connection line chart
Fig. 2-1 is photovoltaic array winding diagram in parallel
The topological structure schematic diagram of the control photovoltaic array PID of Fig. 3 designed by the present invention.
The topological structure remote operation schematic diagram of the control photovoltaic array PID of Fig. 4 designed by the present invention
Embodiment
Embodiment 1
As shown in Figure 1 to Figure 3, the topological structure of a kind of control photovoltaic array PID that unites that the present embodiment provides, A+, A-, B+ and B-that four corresponding two groups of DC cabinets of pile crown L1, L3, L5 and L7 difference export; Outgoing line side, the L6 of L2 and the QF2 of the QF1 conduct+Ud that is connected exports, and the L4 of L8 and the QF2 of the QF1 conduct-Ud that is connected exports; The L4 of QF1, L2, L8 of L6 and QFQ2 are connected between two as 0V output and are connected with grounding system; Two circuit breakers (isolating switch) have any time and only have one to close, between realize interlocking by mechanical mutual lock shaft, Manual structure is without secondary power supply and feedback node;
By both positive and negative polarity short circuit and ground connection during array no-voltage at night, regularly by reverse for photovoltaic array output port current potential;
In first four-pole circuit breaker in the first output switching terminal and the second four-pole circuit breaker the 3rd output switching terminal jointly as positive direct-current output, in first four-pole circuit breaker, in second, third output switching terminal and the second four-pole circuit breaker, the first, the 4th output switching terminal is jointly by grounding system ground connection, and in the first four-pole circuit breaker, the 4th output switching terminal is common as bearing DC output end with second switch output in the second four-pole circuit breaker.
Embodiment 2
The topological structure of a kind of control photovoltaic array PID that unites that the present embodiment provides, A+, A-, B+ and B-that four corresponding two groups of DC cabinets of pile crown L1, L3, L5 and L7 difference export; Outgoing line side, the L6 of L2 and the QF2 of the QF1 conduct+Ud that is connected exports, and the L4 of L8 and the QF2 of the QF1 conduct-Ud that is connected exports; The L4 of QF1, L2, L8 of L6 and QFQ2 are connected between two as 0V output and are connected with grounding system; Two circuit breakers (isolating switch) have any time and only have one to close, between realize interlocking by mechanical mutual lock shaft, Manual structure is without secondary power supply and feedback node;
By both positive and negative polarity short circuit and ground connection during array no-voltage at night, regularly by reverse for photovoltaic array output port current potential;
In first four-pole circuit breaker in the first output switching terminal and the second four-pole circuit breaker the 3rd output switching terminal jointly as positive direct-current output, in first four-pole circuit breaker, in second, third output switching terminal and the second four-pole circuit breaker, the first, the 4th output switching terminal is jointly by grounding system ground connection, and in the first four-pole circuit breaker, the 4th output switching terminal is common as bearing DC output end with second switch output in the second four-pole circuit breaker;
The topological structure of aforesaid control photovoltaic array PID, the switch of described four-pole circuit breaker is isolating switch or on-load switch.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (2)
1. unite and prevent and treat a topological structure of photovoltaic array PID, it is characterized in that, A+, A-, B+ and B-that four corresponding two groups of DC cabinets of pile crown L1, L3, L5 and L7 difference export; Outgoing line side, the L6 of L2 and the QF2 of the QF1 conduct+Ud that is connected exports, and the L4 of L8 and the QF2 of the QF1 conduct-Ud that is connected exports; The L4 of QF1, L2, L8 of L6 and QFQ2 are connected between two as 0V output and are connected with grounding system; Two circuit breakers (isolating switch) have any time and only have one to close, between realize interlocking by mechanical mutual lock shaft, Manual structure is without secondary power supply and feedback node;
By both positive and negative polarity short circuit and ground connection during array no-voltage at night, regularly by reverse for photovoltaic array output port current potential;
In first four-pole circuit breaker in the first output switching terminal and the second four-pole circuit breaker the 3rd output switching terminal jointly as positive direct-current output, in first four-pole circuit breaker, in second, third output switching terminal and the second four-pole circuit breaker, the first, the 4th output switching terminal is jointly by grounding system ground connection, and in the first four-pole circuit breaker, the 4th output switching terminal is common as bearing DC output end with second switch output in the second four-pole circuit breaker.
2. the topological structure being applicable to bipolarity systemic control photovoltaic array PID according to claim 1, is characterized in that, the switch of described four-pole circuit breaker is isolating switch or on-load switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410425125.9A CN104467651A (en) | 2014-08-27 | 2014-08-27 | Topological structure for preventing photovoltaic array PID |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410425125.9A CN104467651A (en) | 2014-08-27 | 2014-08-27 | Topological structure for preventing photovoltaic array PID |
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| CN104467651A true CN104467651A (en) | 2015-03-25 |
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| CN201410425125.9A Pending CN104467651A (en) | 2014-08-27 | 2014-08-27 | Topological structure for preventing photovoltaic array PID |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579156A (en) * | 2014-11-19 | 2015-04-29 | 南京信息职业技术学院 | PID (proportion integration differentiation) suppression device of bipolar photovoltaic array system |
| WO2022126601A1 (en) * | 2020-12-18 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system and power system |
| WO2022247428A1 (en) * | 2021-05-27 | 2022-12-01 | 华为数字能源技术有限公司 | Photovoltaic power generation system and conversion circuit |
-
2014
- 2014-08-27 CN CN201410425125.9A patent/CN104467651A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579156A (en) * | 2014-11-19 | 2015-04-29 | 南京信息职业技术学院 | PID (proportion integration differentiation) suppression device of bipolar photovoltaic array system |
| CN104579156B (en) * | 2014-11-19 | 2017-02-22 | 南京信息职业技术学院 | PID (proportion integration differentiation) suppression device of bipolar photovoltaic array system |
| WO2022126601A1 (en) * | 2020-12-18 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system and power system |
| WO2022247428A1 (en) * | 2021-05-27 | 2022-12-01 | 华为数字能源技术有限公司 | Photovoltaic power generation system and conversion circuit |
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