CN105743434B - Photovoltaic module common-mode voltage suppression system over the ground in a kind of photovoltaic generating system - Google Patents
Photovoltaic module common-mode voltage suppression system over the ground in a kind of photovoltaic generating system Download PDFInfo
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- CN105743434B CN105743434B CN201610235786.4A CN201610235786A CN105743434B CN 105743434 B CN105743434 B CN 105743434B CN 201610235786 A CN201610235786 A CN 201610235786A CN 105743434 B CN105743434 B CN 105743434B
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- 230000001629 suppression Effects 0.000 title claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 14
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 230000002238 attenuated effect Effects 0.000 abstract description 2
- 230000003071 parasitic effect Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000003850 cellular structure Anatomy 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- 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
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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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
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- Photovoltaic Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Photovoltaic module common-mode voltage suppression system over the ground in a kind of photovoltaic generating system, including photovoltaic module, the photovoltaic DC-to-AC converter being connected with photovoltaic module, multiple branch roads that the photovoltaic module is connected with photovoltaic DC-to-AC converter pass through grid-connected by header box after grid-connected after a multiwinding transformer parallel connection or each branch road connection two-winding transformer；The negative pole of the photovoltaic module is sequentially connected, and then single-point grounding or connection suppress PID devices again；Photovoltaic module earth impedance in parallel branch is shorted out, so as to which common mode current would not flow into the earth impedance loop of photovoltaic module, is inherently eliminated component both positive and negative polarity work mode voltage over the ground；Avoid due to the influence of extraneous uncontrollable factor, and the voltage between causing photovoltaic module both positive and negative polarity over the ground steeply rises, and ultimately results in the abnormal sound of photovoltaic module or the influence that assembly life-span is attenuated.
Description
Technical field
The present invention relates to the common-mode voltage suppression technology field over the ground of photovoltaic module in photovoltaic generating system, and in particular to a kind of
Photovoltaic module common-mode voltage suppression system over the ground in photovoltaic generating system.
Background technology
Concentrated photovoltaic DC-to-AC converter latter stage grid is typically boosted simultaneously using double transformer with split windings or two-winding transformer
Net, but during due to boosting grid-connected by double transformer with split windings or two-winding transformer after more inverter parallels, due to more
The high-frequency signal of shunt chopper can not Complete Synchronization, necessarily lead to a high frequency source between each inverter, because transformer is each
Coupled capacitor and over the ground Y capacitance between winding be present, with reference to photovoltaic module direct-to-ground capacitance and grounding resistance, form high frequency common mode
Circulation, because the difference of transformer manufacture craft causes the parasitic capacitance of inverter ac side larger, or by air ambient
Influence so that the parasitic capacitance of photovoltaic cell component over the ground is smaller, and these can all cause direct current both positive and negative polarity in photovoltaic generating system
Voltage over the ground sharply increases, and can cause photovoltaic module abnormal sound, has a strong impact on the life-span of photovoltaic module.
Fig. 1 a are that two inverter parallels connect, and output using double transformer with split windings boost grid-connected, and Fig. 1 b are two
Inverter parallel connects, and output using two-winding transformer boost grid-connected；In system operation, AC, double points
Fission depressor in two division between coupled capacitor and over the ground Y capacitance be distributed as in fig. la and lb, be distributed in two
Between individual shunt chopper exchange output.DC side, have photovoltaic module direct-to-ground capacitance and prevent PID effects grounding resistance,
The impedance ground device such as fusing, diode.Above impedance and electric power network can form high frequency common mode circulation in internal system, such as scheme
Shown in 2.Z in Fig. 2O-PEIt is the impedance of the virtual midpoint of photovoltaic module over the ground, Z in two parallel branchesACFor transformer coupled electricity
The impedance of appearance, UCOM1-2For the common-mode voltage between parallel branch 1 and parallel branch 2, ICOMFor the common mode electricity of this common mode loop
Stream.When being caused due to step-up transformer manufacture craft, the parasitic capacitance change of each shunt chopper branch road AC is big, i.e. common mode
Impedance Z in loopACReduce, so that common mode loop electric current ICOMIncrease, then battery component over the ground between voltage can be with
Increase severely；Or influenceed by air ambient, the parasitic capacitance of photovoltaic module over the ground can reduce, i.e. the resistance of photovoltaic module negative pole over the ground
Anti- ZO-PEIncrease, then photovoltaic module both positive and negative polarity over the ground between voltage can increase.
The content of the invention
The problem of in order to overcome inferior separating effect existing for above-mentioned prior art, it is an object of the invention to provide a kind of light
Photovoltaic module common-mode voltage suppression system over the ground, is avoided due to the influence of extraneous uncontrollable factor, and lead in photovoltaic generating system
Voltage between causing photovoltaic module both positive and negative polarity over the ground steeply rises, ultimately result in photovoltaic module abnormal sound or assembly life-span by
The influence of decay.
In order to achieve the above object, the present invention adopts the following technical scheme that：
Photovoltaic module common-mode voltage suppression system, including photovoltaic module over the ground in a kind of photovoltaic generating system, with photovoltaic group
The photovoltaic DC-to-AC converter of part connection, multiple branch roads that the photovoltaic module is connected with photovoltaic DC-to-AC converter pass through a multiwinding transformer
It is grid-connected by header box after grid-connected or each branch road connection two-winding transformer after parallel connection；The negative pole of the photovoltaic module connects successively
Connect, then single-point grounding or connection suppress PID devices again；Photovoltaic module earth impedance in parallel branch is shorted out, so as to altogether
Mould electric current would not flow into the earth impedance loop of photovoltaic module, be inherently eliminated component both positive and negative polarity work mode voltage over the ground.
Pass through wire, fuse, miniature circuit breaker, contactor or the low device of impedance between the negative pole of the photovoltaic module
It is attached.
Compared to the prior art the present invention, has the following advantages that：
1) present system is simple, can be achieved without increasing any complex devices.
2) present system is not influenceed by the external condition of rear class transformer and direct current photovoltaic module, can ensure inverter
Reliable and stable operation.
Brief description of the drawings
Fig. 1 a carry out the grid-connected photovoltaic generating system that boosts for existing output using double transformer with split windings.
Fig. 1 b carry out the grid-connected photovoltaic generating system that boosts for existing output using two-winding transformer.
Fig. 2 is existing photovoltaic generating system common mode current equivalent circuit diagram.
Fig. 3 a carry out the grid-connected photovoltaic generating system that boosts for present invention output using multiwinding transformer.
Fig. 3 b carry out the grid-connected photovoltaic generating system that boosts for present invention output using two-winding transformer.
Fig. 4 is photovoltaic generating system common mode current equivalent circuit diagram of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 3 a and Figure 3 b shows, common-mode voltage suppresses system to photovoltaic module over the ground in a kind of photovoltaic generating system of the present invention
System, including photovoltaic module, the photovoltaic DC-to-AC converter being connected with photovoltaic module, as shown in Figure 3 a, the photovoltaic module and photovoltaic inversion
For multiple branch roads of device connection by grid-connected after a multiwinding transformer parallel connection or as shown in Figure 3 b, each branch road connects double winding
It is grid-connected by header box after transformer；The negative pole of the photovoltaic module is sequentially connected, and then single-point grounding or connection suppress PID again
Device；The present embodiment uses resistance earthing.Photovoltaic module earth impedance in parallel branch is shorted out, so as to common mode current
The earth impedance loop of photovoltaic module would not be flowed into, is inherently eliminated component both positive and negative polarity work mode voltage over the ground.
As the preferred embodiment of the present invention, pass through wire, fuse, miniature open circuit between the negative pole of the photovoltaic module
Device, contactor or the low device of impedance are attached.
As shown in figure 4, after the negative pole short circuit of photovoltaic module in each parallel branch, the common mode current in common mode current loops
IcomJust not by photovoltaic module over the ground between impedance, so when the impedance Z of ACACBecause the technological problemses of transformer subtract
Hour, the increase of voltage between will not also making photovoltaic module over the ground, while when environment temperature and humidity changes so that photovoltaic
Component over the ground between parasitic capacitance reduce, impedance ZO-PEIncrease, due to common mode current without flow through battery component over the ground between
Impedance ZO-PE, so impedance ZO-PEOn voltage will not increase because of the increase of impedance, i.e., photovoltaic module negative pole over the ground between
Voltage is unaffected.
The inventive technique is effectively avoided due to the influence of extraneous uncontrollable factor, and causes photovoltaic module both positive and negative polarity pair
Voltage between ground steeply rises, and ultimately results in the abnormal sound of photovoltaic module or the influence that assembly life-span is attenuated.
Claims (2)
- A kind of 1. photovoltaic module common-mode voltage suppression system, including photovoltaic module over the ground in photovoltaic generating system, with photovoltaic module The photovoltaic DC-to-AC converter of connection, multiple branch roads that the photovoltaic module is connected with photovoltaic DC-to-AC converter by a multiwinding transformer simultaneously It is grid-connected by header box after grid-connected or each branch road connection two-winding transformer after connection；It is characterized in that：The photovoltaic module Negative pole is sequentially connected, and then single-point grounding or connection suppress PID devices again；By photovoltaic module earth impedance short circuit in parallel branch Fall, so as to which common mode current would not flow into the earth impedance loop of photovoltaic module, be inherently eliminated component both positive and negative polarity over the ground altogether Mode voltage.
- 2. common-mode voltage suppression system, its feature exist photovoltaic module over the ground in photovoltaic generating system according to claim 1 In：Carried out between the negative pole of the photovoltaic module by wire, fuse, miniature circuit breaker, contactor or the low device of impedance Connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610235786.4A CN105743434B (en) | 2016-04-14 | 2016-04-14 | Photovoltaic module common-mode voltage suppression system over the ground in a kind of photovoltaic generating system |
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| CN201610235786.4A CN105743434B (en) | 2016-04-14 | 2016-04-14 | Photovoltaic module common-mode voltage suppression system over the ground in a kind of photovoltaic generating system |
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| CN105743434A CN105743434A (en) | 2016-07-06 |
| CN105743434B true CN105743434B (en) | 2018-03-27 |
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| AU2020481237A1 (en) * | 2020-12-14 | 2023-06-22 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic system and circulation suppression method |
| EP4344009A1 (en) * | 2021-05-31 | 2024-03-27 | Huawei Digital Power Technologies Co., Ltd. | Multi-inverter parallel system, and grid connection control method for inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103490402A (en) * | 2013-09-05 | 2014-01-01 | 南京南瑞继保电气有限公司 | Photovoltaic module grounding device, photovoltaic module grounding monitoring device and monitoring method |
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| JP2013162628A (en) * | 2012-02-06 | 2013-08-19 | Meidensha Corp | Power generating system, and ground leakage current suppression method of power generating system |
| CN103973217B (en) * | 2014-05-19 | 2017-01-18 | 上能电气股份有限公司 | Device for restraining PID effect of photovoltaic panel |
| CN104377732B (en) * | 2014-11-21 | 2016-09-14 | 南车株洲电力机车研究所有限公司 | A kind of based on dc bus distributed MPPT photovoltaic generating system |
| CN104578141B (en) * | 2014-12-05 | 2017-05-24 | 天津电气科学研究院有限公司 | Multi-way MPPT photovoltaic inversion system |
| CN205584123U (en) * | 2016-04-14 | 2016-09-14 | 特变电工西安电气科技有限公司 | Photovoltaic module is to ground common mode voltage suppression circuit among photovoltaic power generation system |
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| CN103490402A (en) * | 2013-09-05 | 2014-01-01 | 南京南瑞继保电气有限公司 | Photovoltaic module grounding device, photovoltaic module grounding monitoring device and monitoring method |
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