CN209402169U - A kind of inverter ac multi-machine parallel connection system of solar power generation - Google Patents
A kind of inverter ac multi-machine parallel connection system of solar power generation Download PDFInfo
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- CN209402169U CN209402169U CN201822076786.1U CN201822076786U CN209402169U CN 209402169 U CN209402169 U CN 209402169U CN 201822076786 U CN201822076786 U CN 201822076786U CN 209402169 U CN209402169 U CN 209402169U
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- inverter
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- loop current
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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 utility model relates to a kind of inverter ac multi-machine parallel connection systems of solar power generation, including n solar power system, n >=2, each solar power system is connected with an inverter, it is characterized in that, n platform inverter is connected with the input terminal of n platform contactor respectively via the loop current suppression unit that can cut into, cut out, the output terminal direct paralleled rear access power grid of n platform contactor.The utility model puts into loop current suppression unit before grid-connected inverters, inhibits the acute variation of grid-connected moment common-mode voltage.Loop current suppression unit is cut out after grid-connected, improves inverter efficiency, reduces photovoltaic generating system construction cost.
Description
Technical field
The utility model relates to a kind of inverter ac multi-machine parallel connection systems in solar power generation.
Background technique
Important component of the solar power generation as new energy, obtains increasing development.Solar energy is restricted at present
Photovoltaic power generation project, mainly monovalent higher cost.It is carried forward vigorously today of cheap internet access in Chinese Government, cost will be very much
The first element that project can be promoted successfully.For centralized power station, the costs such as solar panel are cast aside, with the inverse of output transformer
It is high to become device scheme cost, reducing transformer winding in such a way that inverter ac is in parallel reduces the mode of cost, is
The direction of trend of the times.
For from current technology, the exchange parallel connection of distributed inverter has been widely applied, but for centralization
, due to various reasons can only be by two independent windings of isolated transformer come grid-connected for inverter parallel, this is from side
Face increases the cost of centralization.Current research exchange mainstream technology in parallel, controls the mode of BUS voltage difference to realize, example
Such as:
(1) the current domestic technical solution about centralized inverter parallel connection, as mentioned in patent " CN 104538987A "
The modes of control two inverter bus voltage differences reduce the circulation between two inverters.Two inverters of this needs
Between have data communication, after data communication is disturbed or data line disconnects, the normal amount of generating electricity by way of merging two or more grid systems may be will affect.
(2) restrictive condition is more when controlling the mode of BUS voltage for more inverter ac parallel connections, practical application situation
It is restricted, as mentioned detection in patent " CN 104538987A " and controlling two BUS voltage differences in smaller range
It is interior, if when more inverter ac parallel connections, since operating condition is multifarious, using meeting by considerable restraint.
Utility model content
The purpose of this utility model is: realizing that more inverter ac outlet sides are directly in parallel, to reduce photovoltaic entirety
The cost of scheme.
In order to achieve the above object, there is provided a kind of friendships of the inverter of solar power generation for the technical solution of the utility model
Multi-machine parallel connection system is flowed, including n solar power system, n >=2, each solar power system are connected with an inverter,
It is characterized in that, n platform inverter is connected with the input terminal of n platform contactor respectively via the loop current suppression unit that can cut into, cut out,
The output terminal direct paralleled rear access power grid of n platform contactor.
Preferably, the control terminal of each loop current suppression unit is connected with the control unit of corresponding inverter internal.
The utility model puts into loop current suppression unit before grid-connected inverters, inhibits the violent change of grid-connected moment common-mode voltage
Change.Loop current suppression unit is cut out after grid-connected, improves inverter efficiency, reduces photovoltaic generating system construction cost.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
As shown in Figure 1, a kind of inverter ac multi-machine parallel connection system of solar power generation disclosed in the present embodiment includes n
Solar power system PV1, PV2 ... ..., PVn, n >=2, each solar power system are connected with an inverter, i.e. the sun
Can electricity generation system PV1, PV2 ..., PVn respectively with inverter 1, inverter 2 ..., inverter n is connected.N platform inverter warp
It is connected respectively with the input terminal of n platform contactor by the loop current suppression unit that can cut into, cut out, the output end of n platform contactor is direct
Power grid is accessed after parallel connection.The control terminal of each loop current suppression unit is connected with the control unit of corresponding inverter internal.
After inverter meets grid-connected conditions, inverter internal processing unit detects this state, to inverter internal
Control unit issues instruction, and first closed loop inhibits unit, grid-connected contactor is closed after some time, due to loop current suppression
Unit has been put into inverter, so part common mode current is limited by loop current suppression unit when grid-connected contactor is attracted moment,
Grid-connected transient current change rate reduces.Inverter completes this grid-connected process, and inverter internal processing unit detects grid-connected complete
The some time is waited after all meeting inverter requirement at, other parameters, guarantees that inverter work is without exception, then to inverter internal
Control unit issues instruction, and loop current suppression unit is cut out from inverter, completes the entire course of work.When separate unit needs to overhaul
Or when because of other failure off-grids, other inverters operate normally, Awaiting Overhaul finish and Failure elimination after, by the above logic completion simultaneously
Network process.
In the electricity generation system directly in parallel of exchange side, inverter can effectively be solved in grid-connected wink by the utility model
Between and soft during, because DC voltage pressure difference is excessive and DC voltage acute variation, bring the problem that circulation is excessive.
Claims (2)
1. a kind of inverter ac multi-machine parallel connection system of solar power generation, including n solar power system, n >=2, each
Solar power system is connected with an inverter, which is characterized in that n platform inverter is via the loop current suppression that can cut into, cut out
Unit is connected with the input terminal of n platform contactor respectively, the output terminal direct paralleled rear access power grid of n platform contactor.
2. a kind of inverter ac multi-machine parallel connection system of solar power generation as described in claim 1, which is characterized in that each
The control terminal of the loop current suppression unit is connected with the control unit of corresponding inverter internal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822076786.1U CN209402169U (en) | 2018-12-11 | 2018-12-11 | A kind of inverter ac multi-machine parallel connection system of solar power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822076786.1U CN209402169U (en) | 2018-12-11 | 2018-12-11 | A kind of inverter ac multi-machine parallel connection system of solar power generation |
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| CN209402169U true CN209402169U (en) | 2019-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822076786.1U Active CN209402169U (en) | 2018-12-11 | 2018-12-11 | A kind of inverter ac multi-machine parallel connection system of solar power generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2018
- 2018-12-11 CN CN201822076786.1U patent/CN209402169U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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