CN203839980U - Photovoltaic power station grid-connected system - Google Patents
Photovoltaic power station grid-connected system Download PDFInfo
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- CN203839980U CN203839980U CN201420280395.0U CN201420280395U CN203839980U CN 203839980 U CN203839980 U CN 203839980U CN 201420280395 U CN201420280395 U CN 201420280395U CN 203839980 U CN203839980 U CN 203839980U
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- 230000001131 transforming effect Effects 0.000 claims description 32
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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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
A photovoltaic power station grid-connected system comprises photovoltaic power generation units, grid-connected inverters, grid-connected switches, regional power grid current collection busbars, section circuit breakers, a main step-up transformer, a standby step-up transformer, interconnection switches and an external power distribution network. The photovoltaic power generation units are in series connection with the grid-connected inverters and the grid-connected switches and then connected with the regional power grid current collection busbars. All the regional power grid current collection busbars are connected in parallel, and two ends of each regional power grid current collection busbar are connected with the main step-up transformer and the standby step-up transformer respectively. Any two regional power grid current collection busbars are connected to form a ring type network structure. The main step-up transformer and the standby step-up transformer are connected with the external power distribution network via the interconnection switches. The system enables a redundancy function of photovoltaic power station grid connection to be achieved and the running reliability of a photovoltaic power station to be increased. The main step-up transformer and the standby step-up transformer are adopted, so that if the main step-up transformer breaks down or is serviced, the standby step-up transformer allows a photovoltaic power station to keep functioning to improve the reliability of the system.
Description
Technical field
The utility model relates to photovoltaic power generation technology field, specifically a kind of photovoltaic electric station grid connection system.
Background technology
In recent years, photovoltaic generation development rapidly, occupies an important seat in renewable energy power generation.The photovoltaic generating system being incorporated into the power networks is that photovoltaic plant is incorporated to conventional operation of power networks, provides electric power to extraneous power distribution network.Electrical system is the main part of photovoltaic plant, include a large amount of electric equipments, as shown in Figure 1, at present, photovoltaic electric station grid connection generally adopts star structure, first photovoltaic generation unit adopts star structure to be connected with regional power grid current collection bus, and then regional power grid current collection bus adopts star structure to be connected with step-up transformer, and step-up transformer accesses extraneous power distribution network.Photovoltaic plant adopts the also net mode of star structure, general cost is lower, but, its reliable rate is lower, the closer to the line failure of step-up transformer, impact on photovoltaic plant is larger, and especially, in the time that step-up transformer accesses bus between extraneous power distribution network and breaks down, whole photovoltaic plant will paralyse.
Utility model content
For above-mentioned deficiency, the utility model provides a kind of photovoltaic electric station grid connection system, and it can improve the operational reliability of photovoltaic plant.
The technical scheme in the invention for solving the technical problem is: a kind of photovoltaic electric station grid connection system, comprise photovoltaic generation unit, combining inverter, regional power grid current collection bus, step-up transformer and extraneous power distribution network, it is characterized in that, also comprise grid-connected switch and interconnection switch, described step-up transformer comprises primary voltage boosting transforming device and voltage boosting transforming device for subsequent use; Described photovoltaic generation unit is connected successively after combining inverter and grid-connected switch and is accessed regional power grid current collection bus, the two ends of described regional power grid current collection bus are connected with voltage boosting transforming device for subsequent use with primary voltage boosting transforming device respectively, and described primary voltage boosting transforming device and voltage boosting transforming device for subsequent use access extraneous power distribution network by interconnection switch respectively; All regional power grid current collection buses are connected in parallel between primary voltage boosting transforming device and voltage boosting transforming device for subsequent use, and any two regional power grid current collection buses form ring network structure.
Further, photovoltaic electric station grid connection system described in the utility model also comprises section breaker, and described section breaker is connected between adjacent two regional power grid current collection buses.
Further, described photovoltaic generation unit comprises solar photovoltaic cell panel and direct current conflux case, described solar photovoltaic cell panel, direct current conflux case and combining inverter are connected successively, and described direct current conflux case is all connected with a batteries by a charge and discharge device with combining inverter.
The beneficial effects of the utility model are: adopt after said structure, the regional power grid current collection bus of photovoltaic electric station grid connection system described in the utility model adopts ring network structure to be connected, make the each photovoltaic cells institute electricity of photovoltaic plant have two passages to enter extraneous power distribution network, realize the redundancy feature of photovoltaic electric station grid connection, improved the reliable rate of photovoltaic plant; Adopt primary, spare voltage boosting transforming device, in the time that primary voltage boosting transforming device breaks down or overhauls, still have voltage boosting transforming device for subsequent use can maintain photovoltaic plant operation, strengthened system reliability.
Brief description of the drawings
Fig. 1 is the structural representation of photovoltaic electric station grid connection system in prior art;
Fig. 2 is the structural representation of photovoltaic electric station grid connection system described in the utility model;
In figure, 1 photovoltaic generation unit, 11 combining inverters, 12 grid-connected switches, 2 regional power grid current collection buses, 21 section breakeres, 3 step-up transformers, 31 primary voltage boosting transforming devices, 32 voltage boosting transforming devices for subsequent use, 33 interconnection switches, 4 extraneous power distribution networks.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by embodiment, and in conjunction with its accompanying drawing, the utility model is elaborated.Disclosing below provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts to specific examples and setting are described.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.It should be noted that illustrated parts are not necessarily drawn in proportion in the accompanying drawings.The utility model has omitted the description of known assemblies and treatment technology and technique to avoid unnecessarily limiting the utility model.
As shown in Figure 2, a kind of photovoltaic electric station grid connection system of the present utility model, it comprises photovoltaic generation unit 1, combining inverter 11, grid-connected switch 12, regional power grid current collection bus 2, section breaker 21, primary voltage boosting transforming device 31, voltage boosting transforming device 32 for subsequent use, interconnection switch 33 and extraneous power distribution network 4; Described photovoltaic generation unit 1 comprises solar photovoltaic cell panel and direct current conflux case, and described solar photovoltaic cell panel is regional power grid current collection bus 2 corresponding to series direct current header box, combining inverter 11 and the rear access of grid-connected switch 12 successively; The two ends of all regional power grid current collection buses 2 are connected with voltage boosting transforming device 32 for subsequent use with primary voltage boosting transforming device 31 respectively, and described primary voltage boosting transforming device 31 and voltage boosting transforming device 32 for subsequent use access extraneous power distribution network 4 by interconnection switch 33 respectively.All regional power grid current collection buses 2 are connected in parallel between primary voltage boosting transforming device 31 and voltage boosting transforming device 32 for subsequent use, any two regional power grid current collection buses form ring network structure, and be provided with section breaker 21 between adjacent two regional power grid current collection buses 2, in the time of electric equipment or line failure, faulty equipment or circuit are cut out rapidly from electric power system, ensure the operation of fault-free equipment in electric power system.
In regional power grid current collection bus described in the utility model, arbitrary two current collection buses all adopt ring network structure to be connected, make the each photovoltaic cells institute electricity of photovoltaic plant have two passages to enter extraneous power distribution network, realize the redundancy feature of photovoltaic electric station grid connection, improved the reliable rate of photovoltaic plant; Adopt one main one for two voltage boosting transforming devices, in the time that primary voltage boosting transforming device breaks down or overhauls, still have voltage boosting transforming device for subsequent use can maintain photovoltaic plant operation, strengthened system reliability.
As further scheme, photovoltaic electric station grid connection system described in the utility model also comprises charge and discharge device and batteries, and direct current conflux case is all connected with batteries by charge and discharge device with combining inverter.Batteries can be used for visual plant power supply, and stores unnecessary electric energy.
The above is preferred implementation of the present utility model; for those skilled in the art; not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection range of the present utility model.
Claims (3)
1. a photovoltaic electric station grid connection system, comprise photovoltaic generation unit, combining inverter, regional power grid current collection bus, step-up transformer and extraneous power distribution network, it is characterized in that, also comprise grid-connected switch and interconnection switch, described step-up transformer comprises primary voltage boosting transforming device and voltage boosting transforming device for subsequent use; Described photovoltaic generation unit is connected successively after combining inverter and grid-connected switch and is accessed regional power grid current collection bus, the two ends of described regional power grid current collection bus are connected with voltage boosting transforming device for subsequent use with primary voltage boosting transforming device respectively, and described primary voltage boosting transforming device and voltage boosting transforming device for subsequent use access extraneous power distribution network by interconnection switch respectively; All regional power grid current collection buses are connected in parallel between primary voltage boosting transforming device and voltage boosting transforming device for subsequent use, and any two regional power grid current collection buses form ring network structure.
2. a kind of photovoltaic electric station grid connection system according to claim 1, is characterized in that, also comprises section breaker, and described section breaker is connected between adjacent two regional power grid current collection buses.
3. a kind of photovoltaic electric station grid connection system according to claim 1 and 2, it is characterized in that, described photovoltaic generation unit comprises solar photovoltaic cell panel and direct current conflux case, described solar photovoltaic cell panel, direct current conflux case and combining inverter are connected successively, and described direct current conflux case is all connected with a batteries by a charge and discharge device with combining inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420280395.0U CN203839980U (en) | 2014-05-29 | 2014-05-29 | Photovoltaic power station grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420280395.0U CN203839980U (en) | 2014-05-29 | 2014-05-29 | Photovoltaic power station grid-connected system |
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| Publication Number | Publication Date |
|---|---|
| CN203839980U true CN203839980U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420280395.0U Active CN203839980U (en) | 2014-05-29 | 2014-05-29 | Photovoltaic power station grid-connected system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410348A (en) * | 2014-12-01 | 2015-03-11 | 合肥天舟光伏技术有限公司 | Photovoltaic grid power station |
| WO2017037640A1 (en) * | 2015-09-04 | 2017-03-09 | Alteneiji Hamad Musabeh Ahmed Saif | Enhancing collection of electrical power in an energy collection system |
-
2014
- 2014-05-29 CN CN201420280395.0U patent/CN203839980U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410348A (en) * | 2014-12-01 | 2015-03-11 | 合肥天舟光伏技术有限公司 | Photovoltaic grid power station |
| WO2017037640A1 (en) * | 2015-09-04 | 2017-03-09 | Alteneiji Hamad Musabeh Ahmed Saif | Enhancing collection of electrical power in an energy collection system |
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