CN203312829U - Inverter capable of smoothly switching between grid-off mode and grid-connected mode - Google Patents
Inverter capable of smoothly switching between grid-off mode and grid-connected mode Download PDFInfo
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- CN203312829U CN203312829U CN2013203134367U CN201320313436U CN203312829U CN 203312829 U CN203312829 U CN 203312829U CN 2013203134367 U CN2013203134367 U CN 2013203134367U CN 201320313436 U CN201320313436 U CN 201320313436U CN 203312829 U CN203312829 U CN 203312829U
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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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Abstract
The utility model discloses an inverter comprising an inverter body. The inverter body comprises an inverter power unit and an inverter control unit. The inverter also comprises a far-end contactor, an inverter output voltage sampler and a power grid voltage sampler, wherein the far-end contactor is arranged between the output end of the inverter body and a load or a power grid, the inverter output voltage sampler is arranged at the output end of the inverter body, and the power grid voltage sampler is arranged at the end of the power grid. The inverter control unit sends a grid-off instruction or a grid-connected instruction to the inverter power unit. The inverter control unit also controls the on/off of the far-end contactor arranged between a distributed power generation system and the power grid. The beneficial effects of the inverter are that, the inverter can work in the grid-off mode or in the grid-connected mode, and a switching between the grid-off mode and the grid-connected mode is smoothly performed, so that interaction between distributed renewable energy sources and the power grid is facilitated, a shock on the power grid is prevented, and the safety of the power grid is ensured.
Description
Technical field
The utility model relates to a kind of energy storage inverter and photovoltaic DC-to-AC converter, its can realize the independence of inverter or be incorporated into the power networks and two kinds of operation modes between take over seamlessly, facilitate the mutual use of distribution type renewable energy and electrical network, for the intelligent micro-grid development provides technical guarantee.
Background technology
Distributed power generation typically refers to and utilizes the distributing resource, the installation scale less, be arranged near the electricity generation system the user, its general access is lower than 35 kilovolts or the electrical network of low-voltage-grade more.Distributed generation system comprises the electricity generation systems such as distributed photovoltaic power generation, distributed energy storage, distributed wind energy, oil machine etc., and the concept of intelligent microgrid is arranged.
Distributed photovoltaic power generation can meet namely sends out namely the requirement of using, reducing power transmission and transformation cost and power consumption, therefore, at Urban Scale Application in Building photovoltaic generating system, will become one of principal mode of China's development photovoltaic generation.Along with city distributed photovoltaic system is progressively applied, the building photovoltaic system presents the development trend of densification, multiple spot access urban power distribution network.
At present, be applied to the inverter of distributed photovoltaic power generation system and energy-storage system, only be confined to as conventional current source be incorporated into the power networks or as conventional voltage source from the net independent operating, just realize simple power control, can not, from taking over seamlessly between grid-connected, particularly can't realize from net to grid-connected taking over seamlessly.
In prior art, be mainly to realize by the rigid switching of inverter from net to grid-connected switching, that is to say, after inverter is found the power system restoration power supply, the output phase of uncomfortable inversion device makes it consistent with phase place and the amplitude of electrical network with amplitude, just direct closed distal contactor or static switch.Will inevitably cause the impact to electrical network or inverter like this, probably cause the Head switches trip protection of electrical network, or the accidents such as the overcurrent shutdown of inverter, contactor or static switch damage occur, affect the safety of electrical network.
But the part as intelligent grid, along with a large amount of accesses of distributed energy and the needs of electrical network intelligent construction, require inverter to possess multi-operation mode, can realize independence or be incorporated into the power networks and two kinds of operation modes between take over seamlessly, facilitate the mutual use of distribution type renewable energy and electrical network.
In order to address the above problem, be necessary to invent in fact a kind of inverter taken over seamlessly of realizing from net pattern and grid-connected pattern.
The utility model content
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, and a kind of inverter is provided, can realize the independence of inverter or be incorporated into the power networks and two kinds of operation modes between take over seamlessly, overcome existing technological deficiency.
For achieving the above object, inverter of the present utility model is design like this:
A kind of inverter, it comprises: the inverter body, described inverter body comprises inverter power unit and inverter control unit, this inverter also comprises: be arranged on the far-end contactor between described inverter body output and load or electrical network, be arranged on the inverter output voltage sampler (inverter output voltage sample circuit) of inverter body output, and the line voltage sampler (line voltage sample circuit) that is arranged on the electrical network end; Described inverter control unit sends from net or grid-connected instruction to inverter power unit, and described inverter control unit is also be used to controlling closure or disconnecting the far-end contactor between distributed generation system and electrical network.
As preferred implementation, described far-end contactor is static switch, circuit breaker, or contactor.
Use the inverter control method by switching to grid-connected pattern from the net pattern of inverter of the present utility model to comprise the following steps:
Step 1, line voltage sampler obtain the power system restoration power supply signal, described line voltage sampler by this signal feedback to inverter control unit;
Step 3, inverter control unit, by the sampling of inverter output voltage sampler, compare the parameter A of inverter power unit output and the B parameter of electrical network output;
Step 4, parameter A is consistent with B parameter or parameter A is less than while setting threshold values with respect to the error of B parameter, inverter control unit sends instruction, the far-end contactor that closed load and distributed generation system are connected with electrical network, complete the switching from the net pattern to grid-connected pattern.
As preferred implementation, the setting threshold in described step 4 is 10%.
As preferred implementation, the parameter A in described step 2 comprises voltage-phase, amplitude at least.
As preferred implementation, the B parameter in described step 2 comprises voltage-phase, amplitude at least.
Use inverter of the present utility model by grid-connected pattern to the inverter control method from net pattern switching, comprise the following steps:
Step 1, inverter control unit detect, and obtain the electric network fault signal;
The mode of operation of step 3, adjustment inverter is in voltage source mode, and output voltage parameter X fixes, and electric current is with local load variations;
Step 4, distributed generation system start power supply, complete grid-connected pattern to the switching from the net pattern.
As preferred implementation, the parameter X in described step 3 is voltage magnitude and phase place.
The beneficial effect of inverter of the present utility model is: can realize independence or be incorporated into the power networks and two kinds of operation modes between take over seamlessly, facilitate the mutual use of distribution type renewable energy and electrical network, unlikely impact electrical network, protection power grid security.
The accompanying drawing explanation
Fig. 1 is the block diagram according to an execution mode of the present utility model.
Fig. 2 is inverter by grid-connected pattern to the control flow chart from the switching of net pattern.
Fig. 3 is that inverter is by the control flow chart switched to grid-connected pattern from the net pattern.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Refer to Fig. 1, inverter 1 of the present utility model mainly comprises: inverter body 10, be arranged on the far-end contactor 12 between described inverter body 10 outputs and electrical network, be arranged on the inverter output voltage sampler 14 of inverter body 10 outputs, and the line voltage sampler 16 that is arranged on the electrical network end.
One end of inverter 1 of the present utility model connects the solar battery array for example as the energy-storage battery 30(of local energy storage device), the other end connects local load 50, is convenient to like this inverter 1 of the present utility model from network operation.Simultaneously, an end of the local load 50 of connection also is connected with electrical network 40 by described far-end contactor 12.
Described inverter body 10 comprises inverter power unit 100 and inverter control unit 102.Described inverter control unit 102 can send instruction to inverter power unit 100, and the far-end contactor 12 between closure or disconnection distributed generation system and large electrical network, to realize from net or to be incorporated into the power networks.
Preferably, described far-end contactor also can be used static switch, circuit breaker, and contactor or other switching devices replace.
Inverter 1 of the present utility model is divided into 4 kinds of logical schemas, is described below:
1) inverter works in from the net pattern;
Inverter 1 powers on and allows distributed generation system to start, if distributed generation system is incorporated on electrical network, the described inverter control unit 102 of inverter 1 sends instruction, if at first disconnecting consumers and distributed generation system are off-grid systems with the far-end contactor 12(distributed generation system that large electrical network is connected, be not connected to the grid, can not need above-mentioned steps); Next, inverter control unit 102 sends instruction for inverter power unit 100, makes inverter work in voltage source mode.Now inverter output voltage is stable, and electric current, with local load variations voltage current waveform, works in from the net pattern whole distributed generation system.
2) inverter works in grid-connected pattern
Inverter 1 powers on, energy-storage battery access distributed generation system, and described inverter control unit 102 sends instruction, the far-end contactor 12 that closed local load is connected with large electrical network; Inverter control unit 102 sends instruction for inverter power unit 100, makes inverter 1 work in the grid-connected current source module.Now the inverter output current is carried electric current or carries out management of charging and discharging according to system requirements to the electrical network maximum capacity according to MPPT maximum power point tracking algorithm (MPPT algorithm).
3) inverter works in grid-connected pattern to from the net pattern, switching
Inverter 1 works in the large electric network fault outage of grid-connected current source module; Inverter control unit 102 carries out anti-isolated island detection, assert that electrical network breaks down, and inverter 1 is in island mode; Inverter control unit 102 sends instruction, disconnects the far-end contactor 12 that distributed generation system is connected with large electrical network; The mode of operation of adjusting inverter 1 is in voltage source mode.Now the parameter X of inverter output voltage (for example, amplitude and frequency) is fixing, and electric current, with local load variations, works in from the net pattern whole electricity generation system.
4) inverter works in from the net pattern and switches to grid-connected pattern
Inverter 1 works in voltage source mode, and whole distributed generation system works in from the net pattern, large power system restoration power supply; Inverter 1 line voltage sampler 16 detects power network signal, feeds back to inverter control unit 102; Inverter control unit 102 is phase-locked to line voltage by phase-locked loop, send instruction for inverter power system 100, the output parameter A(that adjusts inverter 1 comprises voltage-phase, amplitude, frequency), make it consistent with the output parameter B (comprising voltage-phase, amplitude, frequency) of electrical network; Inverter control system is by sampling to the inverter output voltage sample circuit, to voltage-phase, amplitude, frequency and the electric network voltage phase of inverter output, amplitude, frequency ratio, while meeting grid-connected the requirement, (parameter A is when consistent or error is less than the threshold values of setting with respect to B parameter, for example be less than 10%), inverter control unit 102 sends instruction, closed load and distributed generation system and the far-end contactor that large electrical network is connected, realize independent operating taking over seamlessly from the net pattern to grid-connected pattern.
Claims (2)
1. inverter, it comprises: the inverter body, described inverter body comprises inverter power unit and inverter control unit, it is characterized in that:
This inverter also comprises: is arranged on the far-end contactor between described inverter body output and load or electrical network, is arranged on the inverter output voltage sampler of inverter body output, and the line voltage sampler that is arranged on the electrical network end;
Described inverter control unit sends from net or grid-connected instruction to inverter power unit, and described inverter control unit is also be used to controlling closure or disconnecting the far-end contactor between distributed generation system and electrical network.
2. inverter as claimed in claim 1, it is characterized in that: described far-end contactor is static switch, circuit breaker, or contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203134367U CN203312829U (en) | 2013-06-03 | 2013-06-03 | Inverter capable of smoothly switching between grid-off mode and grid-connected mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203134367U CN203312829U (en) | 2013-06-03 | 2013-06-03 | Inverter capable of smoothly switching between grid-off mode and grid-connected mode |
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| CN203312829U true CN203312829U (en) | 2013-11-27 |
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| CN2013203134367U Expired - Lifetime CN203312829U (en) | 2013-06-03 | 2013-06-03 | Inverter capable of smoothly switching between grid-off mode and grid-connected mode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296696A (en) * | 2013-06-03 | 2013-09-11 | 深圳市永联科技有限公司 | Inverter and method for controlling same |
| US9660453B2 (en) | 2014-03-07 | 2017-05-23 | Abb Schweiz Ag | Control of a microgrid |
| CN109149649A (en) * | 2018-10-18 | 2019-01-04 | 北京凯华网联新能源技术有限公司 | Base station photovoltaic based on alternating current-direct current input switch power supply is from grid-connected power supply system |
| CN109245161A (en) * | 2018-10-18 | 2019-01-18 | 北京凯华网联新能源技术有限公司 | Photovoltaic for base station is from grid-connected integrated inverter power supply control system and method |
-
2013
- 2013-06-03 CN CN2013203134367U patent/CN203312829U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296696A (en) * | 2013-06-03 | 2013-09-11 | 深圳市永联科技有限公司 | Inverter and method for controlling same |
| CN103296696B (en) * | 2013-06-03 | 2016-03-16 | 深圳市永联科技股份有限公司 | Inverter and control method thereof |
| US9660453B2 (en) | 2014-03-07 | 2017-05-23 | Abb Schweiz Ag | Control of a microgrid |
| CN109149649A (en) * | 2018-10-18 | 2019-01-04 | 北京凯华网联新能源技术有限公司 | Base station photovoltaic based on alternating current-direct current input switch power supply is from grid-connected power supply system |
| CN109245161A (en) * | 2018-10-18 | 2019-01-18 | 北京凯华网联新能源技术有限公司 | Photovoltaic for base station is from grid-connected integrated inverter power supply control system and method |
| CN109149649B (en) * | 2018-10-18 | 2024-04-09 | 北京凯华网联技术有限公司 | Photovoltaic grid-connected power supply system for base station based on alternating current/direct current input switching power supply |
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| CP03 | Change of name, title or address |
Address after: Shenzhen Nanshan District City, Guangdong province 518055 White Pine Road Baiwang letter two Industrial Park District building seventh Patentee after: SHENZHEN WINLINE TECHNOLOGY Co.,Ltd. Address before: Shenzhen Nanshan District City, Guangdong province 518000 White Pine Road Industrial Park two seventh district Baiwang letter building five floor Patentee before: SHENZHEN WINLINE TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20131127 |
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| CX01 | Expiry of patent term |