CN103414361A - Main circuit topological structure of single megawatt photovoltaic grid-connected inverter - Google Patents
Main circuit topological structure of single megawatt photovoltaic grid-connected inverter Download PDFInfo
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- CN103414361A CN103414361A CN2013103207659A CN201310320765A CN103414361A CN 103414361 A CN103414361 A CN 103414361A CN 2013103207659 A CN2013103207659 A CN 2013103207659A CN 201310320765 A CN201310320765 A CN 201310320765A CN 103414361 A CN103414361 A CN 103414361A
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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 invention belongs to the technical field of photovoltaic grid-connected inverters, and particularly relates to a main circuit topological structure of a single megawatt photovoltaic grid-connected inverter. The main circuit topological structure comprises a plurality of direct-current input unit sets capable of independently recognizing a P-V characteristic curve of an direct-current input array in each path; each direct-current input unit set is connected with a direct-current EMC filtering unit, a direct-current link (DCL) capacitor and a carrier phase-shifting inverting unit, wherein the carrier phase-shifting inverting units are connected to a filter in parallel, and an output voltage control unit is connected to the output end of the filter. The main circuit topological structure of the single megawatt photovoltaic grid-connected inverter has the advantages of being simple in structure, small in size, strong in capacity of resisting disturbance and good in compatibility.
Description
Technical field
The invention belongs to the photovoltaic combining inverter technical field, be specifically related to a kind of unit megawatt photovoltaic grid-connected inverter main circuit topological structure.
Background technology
Megawatt photovoltaic grid-connected inverter, because volume is comparatively huge, for reduce cost, reduces floor space, is convenient to safeguard, aspect environmental suitability, has proposed higher requirement; In addition, for megawatt photovoltaic grid-connected inverter, because electric current is large, disturb also greatly, its parts selection, electromagnetic compatibility, structural configuration etc. are very large to the reliability effect of system, and traditional converter main circuit topology structure as shown in Figure 1, it adopts and composes in parallel, namely the inverter parallel by many platform independent operations forms, and has increased like this volume of inverter, has also wasted manufacturing cost.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of simple in structure, volume is little, antijamming capability is strong, compatible good unit megawatt photovoltaic grid-connected inverter main circuit topological structure.
Realize that technical scheme of the present invention is as follows:
A kind of unit megawatt photovoltaic grid-connected inverter main circuit topological structure, comprise the continuous input cell that the P-V characteristic curves of organizing Ke Duimei road input direct-current array are independently identified more, every group of continuous input cell is connected with direct current EMC filter unit, direct-current chain DCL electric capacity, carrier shifting inversion unit, above-mentioned a plurality of carrier shifting inversions unit is connected to a filter, and the output of this filter is connected with the output voltage control unit.
For the interference in the reduction system, described filter comprises the LC filter, and is connected in the LCL filter after the LC filter.
Described carrier shifting inversion unit is by a plurality of triodes and connect and form.
Adopted such scheme, continuous input cell can design according to self adaptation multimodal maximal power tracing control requirement and the integrated characteristics of direct current cabinet, the P-V characteristic curve of Ke Duimei road input array is independently identified, without external direct current cabinet, reduce the photovoltaic generating system cost, solve again the heavy DC primary cut-out corresponding problem that Vehicles Collected from Market is unable to supply simultaneously; That the present invention has is simple in structure, volume is little, and antijamming capability is strong, compatible good advantage.
The accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit structure diagram of the present invention;
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1,2, a kind of unit megawatt photovoltaic grid-connected inverter main circuit topological structure, comprise the continuous input cell 1 that the P-V characteristic curves of organizing Ke Duimei road input direct-current array are independently identified more, every group of continuous input cell is connected with direct current EMC filter unit 2, direct-current chain DCL electric capacity 3, carrier shifting inversion unit 4, above-mentioned a plurality of carrier shifting inversions unit is connected to a filter, and the output of this filter is connected with output voltage control unit 5.Filter comprises LC filter 6, and is connected in the LCL filter 7 after the LC filter.The carrier shifting inversion unit is by a plurality of triodes and connect and form.
Claims (3)
1. unit megawatt photovoltaic grid-connected inverter main circuit topological structure, it is characterized in that, comprise the continuous input cell that the P-V characteristic curves of organizing Ke Duimei road input direct-current array are independently identified more, every group of continuous input cell is connected with direct current EMC filter unit, direct-current chain DCL electric capacity, carrier shifting inversion unit, above-mentioned a plurality of carrier shifting inversions unit is connected to a filter, and the output of this filter is connected with the output voltage control unit.
2. unit megawatt photovoltaic grid-connected inverter main circuit topological structure according to claim 1, is characterized in that, described filter comprises the LC filter, and be connected in the LCL filter after the LC filter.
3. unit megawatt photovoltaic grid-connected inverter main circuit topological structure according to claim 1, is characterized in that, described carrier shifting inversion unit is by a plurality of triodes and connect and form.
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| CN2013103207659A CN103414361A (en) | 2013-07-26 | 2013-07-26 | Main circuit topological structure of single megawatt photovoltaic grid-connected inverter |
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| CN2013103207659A CN103414361A (en) | 2013-07-26 | 2013-07-26 | Main circuit topological structure of single megawatt photovoltaic grid-connected inverter |
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| CN103414361A true CN103414361A (en) | 2013-11-27 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567567A (en) * | 2009-06-05 | 2009-10-28 | 合肥工业大学 | Carrier shifting inversion large power photovoltaic grid-connection system and control method thereof |
| CN101980436A (en) * | 2010-10-27 | 2011-02-23 | 南京航空航天大学 | Grid-connected photovoltaic inverter device and control method for improving conversion efficiency thereof |
| CN102097966A (en) * | 2011-02-14 | 2011-06-15 | 东南大学 | Cascade megawatt photovoltaic grid-connected inverter |
| CN202564966U (en) * | 2012-03-31 | 2012-11-28 | 上海市电力公司 | Photovoltaic system |
| US20120313442A1 (en) * | 2011-06-08 | 2012-12-13 | Lsis Co., Ltd. | Solar power conversion apparatus |
| CN202841003U (en) * | 2012-08-31 | 2013-03-27 | 广东明阳龙源电力电子有限公司 | Novel three-phase photovoltaic grid-connected inverter system structure |
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2013
- 2013-07-26 CN CN2013103207659A patent/CN103414361A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567567A (en) * | 2009-06-05 | 2009-10-28 | 合肥工业大学 | Carrier shifting inversion large power photovoltaic grid-connection system and control method thereof |
| CN101980436A (en) * | 2010-10-27 | 2011-02-23 | 南京航空航天大学 | Grid-connected photovoltaic inverter device and control method for improving conversion efficiency thereof |
| CN102097966A (en) * | 2011-02-14 | 2011-06-15 | 东南大学 | Cascade megawatt photovoltaic grid-connected inverter |
| US20120313442A1 (en) * | 2011-06-08 | 2012-12-13 | Lsis Co., Ltd. | Solar power conversion apparatus |
| CN202564966U (en) * | 2012-03-31 | 2012-11-28 | 上海市电力公司 | Photovoltaic system |
| CN202841003U (en) * | 2012-08-31 | 2013-03-27 | 广东明阳龙源电力电子有限公司 | Novel three-phase photovoltaic grid-connected inverter system structure |
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Application publication date: 20131127 |