CN105743434A - Photovoltaic module earth common-mode voltage suppression system used for photovoltaic power generation system - Google Patents
Photovoltaic module earth common-mode voltage suppression system used for photovoltaic power generation system Download PDFInfo
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- CN105743434A CN105743434A CN201610235786.4A CN201610235786A CN105743434A CN 105743434 A CN105743434 A CN 105743434A CN 201610235786 A CN201610235786 A CN 201610235786A CN 105743434 A CN105743434 A CN 105743434A
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- photovoltaic module
- photovoltaic
- common
- mode voltage
- earth
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- 230000001629 suppression Effects 0.000 title abstract description 5
- 238000010248 power generation Methods 0.000 title abstract 2
- 238000004804 winding Methods 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 230000003071 parasitic effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 210000003850 cellular structure Anatomy 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
Disclosed is a photovoltaic module earth common-mode voltage suppression system used for a photovoltaic power generation system. The photovoltaic module earth common-mode voltage suppression system comprises a photovoltaic module, and a photovoltaic inverter connected with the photovoltaic module, wherein the multiple branches for connecting the photovoltaic module with the photovoltaic inverter are connected in parallel and then are connected to the power grid through one multi-winding transformer, or each branch is connected with a dual-winding transformer, and then the branches are connected to the power grid through a combiner box; the negative electrodes of the photovoltaic module are connected in sequence, and then are grounded in single points or are connected with a suppression PID apparatus; the photovoltaic module earth impedance is short circuited in the shunt-wound branches, so that common-mode current does not flow to the earth impedance loop of the photovoltaic module; therefore, the module positive electrode and negative electrode earth common-mode voltage is eliminated fundamentally; and the abnormal sound or service life attenuation of the photovoltaic module caused by sharp increase of the earth voltage between the positive electrode and the negative electrode of the photovoltaic module due to external uncontrollable factors can be avoided.
Description
Technical field
The present invention relates to photovoltaic module common-mode voltage suppression technology field over the ground in photovoltaic generating system, being specifically related in a kind of photovoltaic generating system photovoltaic module common-mode voltage over the ground suppresses system.
Background technology
nullConcentrated photovoltaic DC-to-AC converter latter stage grid be generally adopted double; two transformer with split winding or two-winding transformer to carry out boosting grid-connected，But during owing to boosting grid-connected by double; two transformer with split windings or two-winding transformer after multiple stage inverter parallel，Owing to the high-frequency signal of multiple stage shunt chopper cannot Complete Synchronization，A high frequency source is necessarily led between each inverter，Owing to there is coupling electric capacity and Y capacitance over the ground between each winding of transformator，In conjunction with photovoltaic module direct-to-ground capacitance and earth resistance，Form high frequency common mode circulation，Owing to the difference of transformator processing technology causes that the parasitic capacitance of inverter ac side is bigger，Or the impact by air ambient，Make photovoltaic cell component parasitic capacitance over the ground less，These all can make direct current both positive and negative polarity voltage over the ground in photovoltaic generating system sharply increase，Photovoltaic module abnormal sound can be caused，Have a strong impact on the life-span of photovoltaic module.
Fig. 1 a is that two inverter parallels connect, and it is grid-connected that output adopts double; two transformer with split winding to carry out boosting, and Fig. 1 b is that two inverter parallels connect, and it is grid-connected that output adopts two-winding transformer to carry out boosting；In system operation, AC, coupling electric capacity between in double; two transformer with split windings two divisions and over the ground Y capacitance are distributed as in fig. la and lb, are distributed between two shunt choppers exchanges export.DC side, has photovoltaic module direct-to-ground capacitance and prevents the impedance ground devices such as the earth resistance of PID effect, fusing, diode.Above impedance and electric power network can form high frequency common mode circulation in internal system, as shown in Figure 2.Z in Fig. 2O-PEIt is the impedance over the ground of the virtual midpoint of photovoltaic module, Z in two parallel branchesACFor the impedance of transformer coupled capacitor, UCOM1-2For the common-mode voltage between parallel branch 1 and parallel branch 2, ICOMCommon mode current for this common mode loop.When the parasitic capacitance causing each shunt chopper branch road AC due to booster transformer processing technology becomes big, i.e. impedance Z in common mode loopACReduce, so that common mode loop electric current ICOMIncrease, then battery component over the ground between voltage can along with sharp increase；Or the impact by air ambient, photovoltaic module parasitic capacitance over the ground can reduce, i.e. photovoltaic module negative pole impedance Z over the groundO-PEIncrease, then photovoltaic module both positive and negative polarity over the ground between voltage can increase.
Summary of the invention
For the problem overcoming inferior separating effect that above-mentioned prior art exists, it is an object of the invention to provide photovoltaic module common-mode voltage over the ground in a kind of photovoltaic generating system and suppress system, avoid due to the impact of extraneous uncontrollable factor, and cause that the voltage between photovoltaic module both positive and negative polarity is over the ground steeply rises, ultimately result in the abnormal sound of photovoltaic module or the impact that assembly life-span is attenuated.
In order to achieve the above object, the present invention adopts the following technical scheme that
In a kind of photovoltaic generating system, photovoltaic module common-mode voltage over the ground suppresses system, including photovoltaic module, the photovoltaic DC-to-AC converter being connected with photovoltaic module, multiple branch roads that described photovoltaic module is connected with photovoltaic DC-to-AC converter are grid-connected by header box after connecting two-winding transformer by grid-connected after a multiwinding transformer parallel connection or each branch road；The negative pole of described photovoltaic module is sequentially connected with, and then single-point grounding or connection suppress PID device again；Photovoltaic module earth impedance in parallel branch is shorted out, thus common mode current would not flow into the earth impedance loop of photovoltaic module, is inherently eliminated assembly both positive and negative polarity work mode voltage over the ground.
It is attached by the device that wire, fuse, miniature circuit breaker, catalyst or impedance are low between the negative pole of described photovoltaic module.
Compared to the prior art the present invention, has the advantage that
1) present system is simple, it is not necessary to increasing any complex devices can realize.
2) present system not external condition by rear class transformator and direct current light photovoltaic assembly affects, and all can ensure the reliable and stable operation of inverter.
Accompanying drawing explanation
Fig. 1 a is that existing output adopts double; two transformer with split winding to carry out the photovoltaic generating system that boosting is grid-connected.
Fig. 1 b is that existing output adopts two-winding transformer to carry out the photovoltaic generating system that boosting is grid-connected.
Fig. 2 is existing photovoltaic generating system common mode current equivalent circuit diagram.
Fig. 3 a is that the present invention exports and adopts multiwinding transformer to carry out the grid-connected photovoltaic generating system of boosting.
Fig. 3 b is that the present invention exports and adopts two-winding transformer to carry out the grid-connected photovoltaic generating system of boosting.
Fig. 4 is photovoltaic generating system common mode current equivalent circuit diagram of the present invention.
Detailed description of the invention
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, in one photovoltaic generating system of the present invention, photovoltaic module common-mode voltage over the ground suppresses system, including photovoltaic module, the photovoltaic DC-to-AC converter being connected with photovoltaic module, as shown in Figure 3 a, multiple branch roads that described photovoltaic module is connected with photovoltaic DC-to-AC converter are by grid-connected after a multiwinding transformer parallel connection or as shown in Figure 3 b, each branch road is grid-connected by header box after connecting two-winding transformer；The negative pole of described photovoltaic module is sequentially connected with, and then single-point grounding or connection suppress PID device again；The present embodiment adopts resistance earthing.Photovoltaic module earth impedance in parallel branch is shorted out, thus common mode current would not flow into the earth impedance loop of photovoltaic module, is inherently eliminated assembly both positive and negative polarity work mode voltage over the ground.
As the preferred embodiment of the present invention, it is attached by the device that wire, fuse, miniature circuit breaker, catalyst or impedance are low between the negative pole of described photovoltaic module.
As shown in Figure 4, the common mode current I after the negative pole short circuit of the photovoltaic module in each parallel branch, in common mode current loopscomJust by photovoltaic module over the ground between impedance, so when the impedance Z of ACACDue to transformator technological problems reduce time, without between making photovoltaic module over the ground voltage increase, simultaneously when ambient temperature and humidity change so that photovoltaic module 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, namely photovoltaic module negative pole over the ground between voltage unaffected.
This inventive technique effectively avoids due to the impact of extraneous uncontrollable factor, and causes that the voltage between photovoltaic module both positive and negative polarity is over the ground steeply rises, and ultimately results in the abnormal sound of photovoltaic module or the impact that assembly life-span is attenuated.
Claims (2)
1. in a photovoltaic generating system, photovoltaic module common-mode voltage over the ground suppresses system, including photovoltaic module, the photovoltaic DC-to-AC converter being connected with photovoltaic module, multiple branch roads that described photovoltaic module is connected with photovoltaic DC-to-AC converter are grid-connected by header box after connecting two-winding transformer by grid-connected after a multiwinding transformer parallel connection or each branch road；It is characterized in that: the negative pole of described photovoltaic module is sequentially connected with, then single-point grounding or connection suppress PID device again；Photovoltaic module earth impedance in parallel branch is shorted out, thus common mode current would not flow into the earth impedance loop of photovoltaic module, is inherently eliminated assembly both positive and negative polarity work mode voltage over the ground.
2. in photovoltaic generating system according to claim 1, photovoltaic module common-mode voltage over the ground suppresses system, it is characterised in that: it is attached by the device that wire, fuse, miniature circuit breaker, catalyst or impedance are low between the negative pole of described photovoltaic module.
Priority Applications (1)
| 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 true CN105743434A (en) | 2016-07-06 |
| CN105743434B CN105743434B (en) | 2018-03-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022126300A1 (en) * | 2020-12-14 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system and circulation suppression method |
| WO2022252095A1 (en) * | 2021-05-31 | 2022-12-08 | 华为数字能源技术有限公司 | Multi-inverter parallel system, and grid connection control method for inverter |
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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 |
| 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 |
| CN103973217A (en) * | 2014-05-19 | 2014-08-06 | 无锡上能新能源有限公司 | Device for restraining PID effect of photovoltaic panel |
| CN104377732A (en) * | 2014-11-21 | 2015-02-25 | 南车株洲电力机车研究所有限公司 | DC bus distributed MPPT photovoltaic power generation system |
| CN104578141A (en) * | 2014-12-05 | 2015-04-29 | 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 |
-
2016
- 2016-04-14 CN CN201610235786.4A patent/CN105743434B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013162628A (en) * | 2012-02-06 | 2013-08-19 | Meidensha Corp | Power generating system, and ground leakage current suppression method of power generating system |
| 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 |
| CN103973217A (en) * | 2014-05-19 | 2014-08-06 | 无锡上能新能源有限公司 | Device for restraining PID effect of photovoltaic panel |
| CN104377732A (en) * | 2014-11-21 | 2015-02-25 | 南车株洲电力机车研究所有限公司 | DC bus distributed MPPT photovoltaic power generation system |
| CN104578141A (en) * | 2014-12-05 | 2015-04-29 | 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022126300A1 (en) * | 2020-12-14 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system and circulation suppression method |
| WO2022252095A1 (en) * | 2021-05-31 | 2022-12-08 | 华为数字能源技术有限公司 | Multi-inverter parallel system, and grid connection control method for inverter |
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| CN105743434B (en) | 2018-03-27 |
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