CN206461374U - A kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter - Google Patents
A kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter Download PDFInfo
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- CN206461374U CN206461374U CN201621104054.3U CN201621104054U CN206461374U CN 206461374 U CN206461374 U CN 206461374U CN 201621104054 U CN201621104054 U CN 201621104054U CN 206461374 U CN206461374 U CN 206461374U
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- 238000002955 isolation Methods 0.000 title claims abstract description 12
- 230000009466 transformation Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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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 provides a kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter, including power section and control section, and wherein power section includes：Photovoltaic battery array, DC/DC boost choppers current transformer, three-phase four-leg inverter, LC wave filters, grid-connected breaker, local load break switch, commonly connected point breaker；Control section includes：Main control unit, driver element.Power section is used to realize solar energy to electric transformation of energy, is that local load and power network are powered.Control section is used for the processing for realizing sampled signal, and closed-loop control is carried out to power section.The utility model can not only ensure the system grid connection quality of power supply under grid side, user's lateral load three-phase imbalance, nonlinear condition, local load supplying is continued as under the conditions of electric network fault, and has the advantages that linear modulationra height, small volume, lightweight, cost are low.
Description
Technical field
The utility model is related to distributed grid-connected/off-network power field, is specifically that one kind is based on three-phase four-leg inverter
Non-isolation type photovoltaic generating system.
Background technology
With the rapid exhaustion of global fossil energy reserve in recent years, the increasingly tight of pollution is brought to ball ecological environment
Weight, the distributed power generation using photovoltaic generation as representative starts the important component as power network.It is continuous in photovoltaic cell price
Under the advantage of decline, photovoltaic generation has welcome great development period in the world.
The application form of current photovoltaic generation can be divided mainly into Independent Power Generation (off-network generating), two major classes of generating electricity by way of merging two or more grid systems.Energy
The isolated form photovoltaic generating system for enough realizing off-network/grid-connect mode switching is the main application form of existing photovoltaic generation, but every
Use from transformer makes system there are problems that big volume, weight weight, cost.At the same time, grid side, user side are a large amount of
Three-phase imbalance, the nonlinear load of presence also result in the deterioration of the system grid connection quality of power supply, and this can be also influenceed during electric network fault
The use of ground load.
The content of the invention
The purpose of this utility model is to propose a kind of non-isolation type photovoltaic generation based on three-phase four-leg inverter
System, solves existing photovoltaic generating system and uses isolating transformer, the problem of cost is high, volume is big, weight is heavy, it is ensured that electricity
The system grid connection quality of power supply under net side, user's lateral load three-phase imbalance, nonlinear condition, can under the conditions of electric network fault
Local load supplying is continued as, and has the advantages that linear modulationra is high.
The purpose of this utility model takes following technical scheme to realize：
A kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter, it is characterised in that：Including power part
Divide and control section, wherein power section includes：Photovoltaic battery array, DC/DC boost choppers current transformer, three-phase four-arm inversion
Device, LC wave filters, grid-connected breaker, local load break switch, commonly connected point breaker；Control section includes：Main control list
Member, driver element；Photovoltaic battery array, DC/DC boost choppers current transformer, three-phase four-leg inverter, LC wave filters connect successively
Connect, local load break switch is connected with local load, and commonly connected point breaker is connected with power network, LC wave filters pass through grid-connected disconnected
Road device is connected with local load break switch and commonly connected point breaker respectively, photovoltaic battery array, DC/DC boost chopper unsteady flows
The signal output part of device and the first signal input part of main control unit are connected, DC/DC boost choppers current transformer and the bridge of three-phase four
The feedback signal output of arm inverter and the secondary signal input of main control unit are connected, the control signal of main control unit
Output end is connected by driver element with DC/DC boost choppers current transformer and three-phase four-leg inverter, grid-connected breaker, local
The input of load break switch and commonly connected point breaker is connected with the 3rd signal input part of main control unit respectively.
Further, control section also includes Auxiliary Control Element, display screen, and main control unit passes through Auxiliary Control Element
It is connected with display screen, main control unit sends backstage display information to Auxiliary Control Element, display screen carries out the display information
It has been shown that, main control unit also receives the judgement feedback of Auxiliary Control Element running status.
Further, driver element is used to amplify the control signal that main control unit is sent, to control DC/DC boost choppers
Switching device opens shut-off in current transformer and three-phase four-leg inverter.
Further, grid-connected breaker is used for the system switching for realizing photovoltaic generating system, and commonly connected point breaker is used
In the switching for realizing photovoltaic generating system off-network/grid-connect mode, local load break switch is used to realize photovoltaic generating system to originally
The power supply of ground load.
The utility model is by the way that based on three-phase four-leg inverter, the separate output of three-phase voltage can be realized using it
The characteristics of, it is proposed that a kind of non-isolation type photovoltaic parallel in system based on three-phase four-leg inverter, can not only grid side,
Ensure the system grid connection quality of power supply under user's lateral load three-phase imbalance, nonlinear condition, continued as under the conditions of electric network fault
Local load supplying, and have the advantages that linear modulationra height, small volume, lightweight, cost are low.
Brief description of the drawings
Fig. 1 is the structural representation of non-isolation type photovoltaic generating system of the utility model based on three-phase four-leg inverter
Figure.
In figure：1-photovoltaic battery array, 2-DC/DC boost chopper current transformers, 3-three-phase four-leg inverter, 4-LC
Wave filter, 5-grid-connected breaker, 6-local load break switch, 7-commonly connected point breaker, 8-main control unit, 9-
Driver element, 10-Auxiliary Control Element, 11-display screen.
Embodiment
Below in conjunction with the accompanying drawing in the utility model, the technical scheme in the utility model is carried out clearly and completely
Description.
The structure that Fig. 1 show non-isolation type photovoltaic generating system of the utility model based on three-phase four-leg inverter is shown
It is intended to, the non-isolation type photovoltaic generating system based on three-phase four-leg inverter includes power section and control section, its
Middle power section includes：Photovoltaic battery array 1, DC/DC boost choppers current transformer 2, three-phase four-leg inverter 3, LC wave filters
4th, grid-connected breaker 5, local load break switch 6, commonly connected point breaker 7；Control section includes：Main control unit 8, driving
Unit 9, Auxiliary Control Element 10, display screen 11.Power section is used to realize solar energy to electric transformation of energy, be local load and
Power network is powered, and control section is used for the processing for realizing sampled signal, and closed-loop control is carried out to power section.
Photovoltaic battery array 1, DC/DC boost choppers current transformer 2, three-phase four-leg inverter 3, LC wave filters 4 connect successively
Connect, photovoltaic battery array 1 is converted solar energy into electrical energy, and is changed according to intensity of sunshine, the photovoltaic battery array for producing change is defeated
Go out DC voltage to DC/DC boost choppers current transformer 2.Local load break switch 6 is connected with local load, points of common connection open circuit
Device 7 is connected with power network, LC wave filters 4 by grid-connected breaker 5 respectively with local load break switch 6 and commonly connected point breaker
7 connections.
First signal of photovoltaic battery array 1, the signal output part of DC/DC boost choppers current transformer 2 and main control unit 8 is defeated
Enter the feedback signal output and main control unit 8 of end connection, DC/DC boost choppers current transformer 2 and three-phase four-leg inverter 3
The connection of secondary signal input, the control signal output of main control unit 8 passes through driver element 9 and DC/DC boost choppers
Current transformer 2 and three-phase four-leg inverter 3 are connected, grid-connected breaker 5, local load break switch 6 and commonly connected point breaker 7
Input be connected respectively with the 3rd signal input part of main control unit 8.
Main control unit 8 obtains photovoltaic battery array output voltage sampled signal by the first signal input part and direct current is female
Line voltage sampled signal, receives local load break switch 6 by the 3rd signal input part and is connected with local load, points of common connection
The voltage x current sampled signal that breaker goes out, is handled voltage x current sampled signal on the basis of reference value, passes through control
Signal output part output control signal passes through the second letter to DC/DC boost choppers current transformer 2 and three-phase four-leg inverter 3
Number input receives DC/DC boost choppers current transformer 2, the control feedback signal of three-phase four-leg inverter 3.
Main control unit 8 is connected by Auxiliary Control Element 10 with display screen 11, and main control unit 8 is to Auxiliary Control Element
10 send backstage display information, and display screen 11 is shown the display information main control unit 8 also receives Auxiliary Control Element
The judgement feedback of 10 running statuses.
Driver element 9 is used to amplify the control signal that main control unit 8 is sent, for controlling the open-minded of related switch device
Shut-off.Shut-off control, 2 pairs of DC/DC boost choppers current transformer are opened by switching device in DC/DC boost choppers current transformer 2
The output DC voltage of photovoltaic battery array 1 of change is boosted, voltage stabilizing processing, and realizes that photovoltaic battery array 1 exports maximum
The tracking of power points；Shut-off control, three-phase four-leg inverter 3 are opened by switching device in three-phase four-leg inverter 3
DC voltage is converted into separate three-phase output AC voltage, its four bridge arms are by passive LC filter 4 respectively with three
The A phase, B phase, C phase of phase four-wire system bus, N lines are connected.
Grid-connected breaker 5 is used for the system switching for realizing photovoltaic generating system, and commonly connected point breaker 7 is used to realize light
The switching of photovoltaic generating system off-network/grid-connect mode, local load break switch 6 is used to realizing photovoltaic generating system to locally loading
Power supply.
It is described above, embodiment only of the present utility model, but protection domain of the present utility model do not limit to
It is any to belong to those skilled in the art in the technical scope that the utility model is disclosed in this, the change that can be readily occurred in
Change or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with power
The protection domain that profit is required is defined.
Claims (2)
1. a kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter, it is characterised in that：Including power section
And control section, wherein power section includes：Photovoltaic battery array (1), DC/DC boost choppers current transformer (2), three-phase four-arm
Inverter (3), LC wave filters (4), grid-connected breaker (5), local load break switch (6), commonly connected point breaker (7)；Control
System part includes：Main control unit (8), driver element (9)；Photovoltaic battery array (1), DC/DC boost choppers current transformer (2),
Three-phase four-leg inverter (3), LC wave filters (4) are sequentially connected, and local load break switch (6) is connected with local load, public
Connection point breaker (7) be connected with power network, LC wave filters (4) by grid-connected breaker (5) respectively with local load break switch (6)
With commonly connected point breaker (7) connection, photovoltaic battery array (1), the signal output part of DC/DC boost choppers current transformer (2)
It is connected with the first signal input part of main control unit (1), DC/DC boost choppers current transformer (2) and three-phase four-leg inverter
(3) feedback signal output is connected with the secondary signal input of main control unit (8), the control letter of main control unit (8)
Number output end is connected by driver element (9) with DC/DC boost choppers current transformer (2) and three-phase four-leg inverter (3), grid-connected
The input of breaker (5), local load break switch (6) and commonly connected point breaker (7) respectively with main control unit (8)
3rd signal input part is connected, and grid-connected breaker (5) is used for the system switching for realizing photovoltaic generating system, points of common connection open circuit
Device (7) is used for the switching for realizing photovoltaic generating system off-network/grid-connect mode, and local load break switch (6) is used to realize that photovoltaic is sent out
Electric system is to the power supply locally loaded；Control section also includes Auxiliary Control Element (10), display screen (11), main control unit
(8) it is connected by Auxiliary Control Element (10) with display screen (11), after main control unit (8) is sent to Auxiliary Control Element (10)
Platform display information, display screen (11) is shown the display information main control unit (8) also receives Auxiliary Control Element (10)
The judgement feedback of running status.
2. the non-isolation type photovoltaic generating system as claimed in claim 1 based on three-phase four-leg inverter, it is characterised in that：
Driver element (9) be used for amplify the control signal that main control unit (8) is sent, with control DC/DC boost choppers current transformer (2) and
Switching device opens shut-off in three-phase four-leg inverter (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621104054.3U CN206461374U (en) | 2016-10-08 | 2016-10-08 | A kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621104054.3U CN206461374U (en) | 2016-10-08 | 2016-10-08 | A kind of non-isolation type photovoltaic generating system based on three-phase four-leg inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199411A (en) * | 2018-01-19 | 2018-06-22 | 湖州积微电子科技有限公司 | Solar energy loads alternating current feedback system |
| CN111786399A (en) * | 2020-07-22 | 2020-10-16 | 兰州兰石恩力微电网有限公司 | Energy storage inverter system for controlling water system ion battery |
| CN113013919A (en) * | 2021-03-04 | 2021-06-22 | 河北工业大学 | Symmetrical double-mode photovoltaic inverter device |
-
2016
- 2016-10-08 CN CN201621104054.3U patent/CN206461374U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199411A (en) * | 2018-01-19 | 2018-06-22 | 湖州积微电子科技有限公司 | Solar energy loads alternating current feedback system |
| CN111786399A (en) * | 2020-07-22 | 2020-10-16 | 兰州兰石恩力微电网有限公司 | Energy storage inverter system for controlling water system ion battery |
| CN113013919A (en) * | 2021-03-04 | 2021-06-22 | 河北工业大学 | Symmetrical double-mode photovoltaic inverter device |
| CN113013919B (en) * | 2021-03-04 | 2023-06-30 | 河北工业大学 | Symmetrical dual-mode photovoltaic inverter device |
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