CN104682859A - Topological structure of photovoltaic power generation system based on DC photovoltaic module - Google Patents
Topological structure of photovoltaic power generation system based on DC photovoltaic module Download PDFInfo
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- CN104682859A CN104682859A CN201510071636.XA CN201510071636A CN104682859A CN 104682859 A CN104682859 A CN 104682859A CN 201510071636 A CN201510071636 A CN 201510071636A CN 104682859 A CN104682859 A CN 104682859A
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- direct current
- photovoltaic module
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- 238000010248 power generation Methods 0.000 title abstract description 6
- 238000004146 energy storage Methods 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000003745 diagnosis Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007726 management method Methods 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 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
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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
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention relates to a topological structure of a photovoltaic power generation system based on a DC photovoltaic module, and belongs to the technical field of photovoltaic power generation. The topological structure comprises the DC photovoltaic module, a GPRS (General Packet Radio Service) module, a DC bus, an inverter, an energy storage device, an energy storage device converter, an AC bus, a two-way ammeter and an AC load. The DC photovoltaic module is connected with the DC bus and the GPRS module; the GPRS module is wirelessly communicated with an upper computer; one end of the energy storage device converter is connected with the DC bus, and the other end of the energy storage device converter is connected with the energy storage device; one end of the inverter is connected with the DC bus, and the other end of the inverter is connected with the AC bus; one end of the two-way ammeter is connected with the AC bus, and the other end is connected with a grid. According to the topological structure, hot spot effects formed by shadow and the like are thoroughly avoided, the generating efficiency of a photovoltaic system is maximized in any lighting condition, the structure is simple and construction is easy, so that the topological structure is especially applied to distributed photovoltaic power stations.
Description
Technical field
The present invention relates to a kind of photovoltaic generating system, especially a kind of photovoltaic generating system topological structure based on direct current photovoltaic module, belongs to technical field of photovoltaic power generation.
Background technology
Photovoltaic generating system topological structure conventional at present has centralized, tandem, multiple branch circuit formula.Wherein, centralized configuration, according to the electric pressure designed and capacity, is connected to header box a large amount of photovoltaic module by the mode of series and parallel connections, then through a centralized inverter, the direct current energy that photovoltaic array exports is transformed to AC energy; Multiple photovoltaic module series connection is formed photovoltaic module string by tandem and multiple branch circuit formula structure, and each component string is by after DC/DC converter boost, and another mistake becomes output AC electric energy.The common drawback of these three kinds of topological structures is: the serial or parallel connection that there is photovoltaic module in system, the MPPT maximum power point tracking of system is for whole connection in series-parallel photovoltaic array or component string, cannot ensure that each assembly all operates in maximum power point, anti-shade ability, even may form hot spot, cause assembly to damage, system reliability is low, greatly reduce the effciency of energy transfer of system, be also difficult to the state information obtaining each assembly simultaneously.
For above-mentioned shortcoming, document is had to point out to adopt AC module formula structure.So-called AC module formula structure is that each photovoltaic module is equipped with a Miniature inverter (MI), forms an AC module, is then parallel on ac bus.Although this structure can overcome other structure heat resistanceheat resistant spot and shade ability, power mismatch, be difficult to effectively realize the problem of MPPT maximum power point tracking (MPPT), but owing to being parallel on ac bus after each AC module inversion, thus each AC module all needs to consider cutting-in control problem, there is the deficiencies such as cutting-in control complexity, cost is high, reliability is low.
For above-mentioned deficiency, existing document is pointed out to adopt DC Module formula structure.CN102158094B discloses a kind of photovoltaic generation DC/DC converter and control method thereof, the method is that several DC/AC inverters are connected a high frequency transformer respectively, one end of the secondary side of all high frequency transformers connects together, the other end connects a single-phase diode respectively and realizes rectification, composition photovoltaic generation DC/DC converter.But there is system configuration complexity, control difficult, construction difficulty, high in cost of production problem in this photovoltaic generation DC/DC converter and control method thereof, does not also relate to the communication issue of each converter.
Summary of the invention
Main purpose of the present invention is: the shortcoming and defect existed for above-mentioned prior art, there is provided structure simple, control flexible and convenient more, be easy to construct, a kind of photovoltaic generating system topological structure based on direct current photovoltaic module of economical, thus easy to utilize.
The present invention solves this technical problem adopted technical scheme: a kind of photovoltaic generating system topological structure based on direct current photovoltaic module, comprises direct current photovoltaic module, GPRS module, DC bus, inverter, energy storage device converter, energy storage device, ac bus, intelligent two-way ammeter, AC load.Described direct current photovoltaic module is connected with described DC bus; Described energy storage device converter one end is connected with described DC bus, and the other end is connected with described energy storage device; Described inverter one end is connected with described DC bus, and the other end is connected with described ac bus; Described AC load is connected with described ac bus; Described intelligence two-way ammeter one end is connected with described ac bus, and the other end is connected with electrical network.
Described direct current photovoltaic module is by photovoltaic module, DC micro converter, communication module forms, described DC micro converter one end is connected with described photovoltaic module, the other end is connected with described DC bus, described DC micro converter is boosting loop, directly the output voltage of described photovoltaic module can be increased to required voltage (as 800V or 400V), it is connected with self control loop, described control loop is connected with described communication module, realize DC boosting, MPPT maximum power point tracking (MPPT) and communication function, the hot spot effect that thorough solution shade etc. are formed, greatly improve generating efficiency.
Further, described direct current photovoltaic modules all in photovoltaic generating system is carried out parallel connection as elementary cell, and is all connected with described DC bus, by power delivery, converge to described DC bus.
Further, described direct current photovoltaic modules all in photovoltaic generating system is divided into some groups; Often group is containing n described direct current photovoltaic module (wherein n≤255) and a described GPRS module, and each described direct current photovoltaic module is all connected with the described GPRS module of this group by its communication module; Described GPRS module and host computer realize radio communication, gather and upload the state information of direct current photovoltaic module, realizing the monitoring and fault diagnosis of direct current photovoltaic module, facilitate system maintenance.
Described energy storage device converter is reversible transducer, realizes management of charging and discharging and the DC bus voltage stabilizing function of energy storage device, and realizes communicating with host computer by RS485 bus.
Described inverter realize DC bus voltage stabilizing and photovoltaic generating system from network operation and the handoff functionality between state that is incorporated into the power networks, and realize communicating with host computer by RS485 bus.
The invention has the beneficial effects as follows: 1) output voltage of photovoltaic module is directly increased to required voltage (as 800V or 400V) by direct current photovoltaic module, directly be connected with DC bus, then directly direct current energy is transformed to AC energy by inverter, without the need to header box; 2) adopt wireless and wire communication mode to gather the state information of each direct current photovoltaic module, to realize each direct current photovoltaic module status monitoring and fault diagnosis, facilitate system maintenance; 3) have system reliability high, control flexible and convenient, anti-local shades and assembly electric parameter mismatch ability is strong, energy conversion efficiency is high, the advantage such as applied widely more, thoroughly can solve the hot spot effect that shade etc. is formed, greatly improve the generating efficiency of whole photovoltaic generating system, under achieving any illumination condition, under particularly not mating illumination condition, power generation efficiency of photovoltaic power generation maximizes; 4) structure simple, be easy to construction, economical, easy to utilize, be particularly suitable for distributed photovoltaic power station.
Accompanying drawing explanation
Accompanying drawing is the schematic diagram of topological structure of the present invention.
Wherein, 1-direct current photovoltaic module; 2-GPRS module; 3-DC bus; 4-inverter; 5-energy storage device converter; 6-energy storage device; 7-ac bus; The two-way ammeter of 8-intelligence; 9-AC load; 10-AC network.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in drawings, a kind of photovoltaic generating system topological structure based on direct current photovoltaic module of the present invention, comprises direct current photovoltaic module 1, GPRS module 2, DC bus 3, inverter 4, energy storage device converter 5, energy storage device 6, ac bus 7, intelligent two-way ammeter 8, AC load 9.Direct current photovoltaic module 1 is connected with DC bus 3; Energy storage device converter 5 one end is connected with DC bus 3, and the other end is connected with energy storage device 6; One end of inverter 4 is connected with DC bus 3, and the other end is connected with ac bus 7, and direct current energy is transformed to AC energy, and is delivered to ac bus 7; AC load 9 is connected with ac bus 7 and obtains electric energy; One end of the two-way ammeter 8 of intelligence is connected with ac bus 7, and the other end is connected with electrical network 10, realizes the bidirectional measuring of electric energy.First photovoltaic generating system is guaranteed to power to AC load 9, if the energy output of photovoltaic generating system is higher than the power consumption of AC load 9, then unnecessary electric energy can be fed electrical network 10; If energy output is lower than the power consumption of AC load 9, then supplemented by electrical network 10, to AC load 9 feed.
Described direct current photovoltaic module 1 is by photovoltaic module PV, DC micro converter MC, communication module forms, described DC micro converter MC one end is connected with described photovoltaic module PV, the other end is connected with DC bus 3, described DC micro converter MC is boosting loop, directly the output voltage of photovoltaic module PV can be increased to required voltage (as 800V or 400V), it is connected with self control loop, described control loop is connected with described communication module, realize DC boosting, MPPT maximum power point tracking (MPPT) and communication function, the hot spot effect that thorough solution shade etc. are formed, greatly improve systems generate electricity efficiency.
Further, direct current photovoltaic modules 1 all in system is carried out parallel connection as elementary cell, and is all connected with DC bus 3, by power delivery, converge to DC bus 3.
Further, direct current photovoltaic modules 1 all in system are divided into N group; Often group is containing n direct current photovoltaic module 1(wherein n≤255) and a GPRS module 2, each direct current photovoltaic module 1 is all connected with the GPRS module 2 of this group by its communication module; Described GPRS module 2 and host computer realize radio communication, gather and upload the state information of direct current photovoltaic module 1, realizing direct current photovoltaic module 1 monitoring and fault diagnosis, facilitate system maintenance.
Energy storage device converter 5 is reversible transducer, realizes management of charging and discharging and DC bus 3 voltage stabilizing function of energy storage device 6, and realizes communicating with host computer by RS485 bus.
Inverter 4 realize DC bus 3 voltage stabilizing and photovoltaic generating system from network operation and the handoff functionality between state that is incorporated into the power networks, and realize communicating with host computer by RS485 bus.
In addition to the implementation, the present invention can also have other execution mode.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of application claims.
Claims (5)
1. the photovoltaic generating system topological structure based on direct current photovoltaic module, comprise direct current photovoltaic module, GPRS module, DC bus, inverter, energy storage device converter, energy storage device, ac bus, intelligent two-way ammeter, AC load, it is characterized in that: described direct current photovoltaic module is connected with described DC bus; Described energy storage device converter one end is connected with described DC bus, and the other end is connected with described energy storage device; Described inverter one end is connected with described DC bus, and the other end is connected with described ac bus; Described AC load is connected with described ac bus; Described intelligence two-way ammeter one end is connected with described ac bus, and the other end is connected with electrical network.
2. a kind of photovoltaic generating system topological structure based on direct current photovoltaic module according to claim 1, it is characterized in that: described direct current photovoltaic module is by photovoltaic module, DC micro converter, communication module forms, described DC micro converter one end is connected with described photovoltaic module, the other end is connected with DC bus, described DC micro converter is connected with self control loop, described control loop is connected with described communication module, realize DC boosting, MPPT maximum power point tracking (MPPT) and communication function, the hot spot effect that thorough solution shade etc. are formed, greatly improve generating efficiency.
3. a kind of photovoltaic generating system topological structure based on direct current photovoltaic module according to claim 1, it is characterized in that: described direct current photovoltaic modules all in photovoltaic generating system carries out parallel connection as elementary cell, and be all connected with described DC bus, by power delivery, converge to described DC bus.
4. a kind of photovoltaic generating system topological structure based on direct current photovoltaic module according to claim 1, it is characterized in that: described direct current photovoltaic modules all in system is divided into some groups, often group is containing n described direct current photovoltaic module (wherein n≤255) and a described GPRS module, and each described direct current photovoltaic module is all connected with the described GPRS module of this group by its communication module; Described GPRS module and host computer realize radio communication, gather and upload the state information of direct current photovoltaic module, realizing the monitoring and fault diagnosis of direct current photovoltaic module, facilitate system maintenance.
5. a kind of photovoltaic generating system topological structure based on direct current photovoltaic module according to claim 1, it is characterized in that: described energy storage device converter is reversible transducer, realize management of charging and discharging and the DC bus voltage stabilizing function of energy storage device, and realize communicating with host computer by RS485 bus.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105262436A (en) * | 2015-11-20 | 2016-01-20 | 协鑫集成（上海）能源科技发展有限公司 | Photovoltaic power system and communication base station electric power all-in-one machine |
| CN107017833A (en) * | 2017-03-09 | 2017-08-04 | 杭州信控科技有限公司 | A kind of solar energy engine module for being adapted to collecting and distributing photovoltaic system |
| CN110474418A (en) * | 2019-08-26 | 2019-11-19 | 珠海格力电器股份有限公司 | DC micro power grid system and its progress control method and device |
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Application publication date: 20150603 |