Abstract
Component mismatch often happens in the module-series photovoltaic system(including centralized, string, multi-strings PV system) due to partial shadowing, which causes a large loss of power generation. Photovoltaic equalizer can process the differential power under the condition of mismatching through parallel power electronic converter without changing the existing photovoltaic system architecture, so that all the modules can work near their maximum power points, which can greatly improve the power generation of the system under the condition of mismatching. This paper proposes a photovoltaic equalizer based on single-input multi-output push-pull converter. The topology has the advantages of simple structure and less switching devices. Firstly, the paper introduces the partial shadowing problem of photovoltaic modules and the principle of photovoltaic equalizer. Then, the topological structure and working principle of the proposed photovoltaic equalizer system are analyzed in detail. Finally, the simulation and verification of the designed photovoltaic equalizer are carried out. The simulated results show that the proposed equalizer can greatly improve the generation capacity of photovoltaic system under mismatching conditions, and the maximum increment can be up to 41%.
Highlights
Photovoltaic Equalizer Based on Single⁃Input Multi⁃Output Push⁃Pull Converter
Component mismatch often happens in the module⁃series photovoltaic system due to partial shadowing, which causes a large loss of power generation
Photovol⁃ taic equalizer can process the differential power under the condition of mismatching through parallel power electronic converter without changing the existing photovoltaic system architecture, so that all the modules can work near their maximum power points, which can greatly improve the power generation of the system under the condition of mis⁃ matching
Summary
系统工作在 MPP1 点处仿真结果如图 8 所示。 PV1 和 PV2 工作在正常光照强度即光照强度为 1 000 W / m2,PV3 工作在 800 W / m2。 图 8a) ~ 8c) 分别为各光伏板的工作电压、电流、功率。 由仿真可 见,PV1 和 PV2 两端电压电流分别为 29 V,7.35 A, 功率为 213. 系统工作在 MPP2 点的仿真结果如图 9 所示。 PV1 和 PV2 工作在正常光照强度即 1 000 W / m2, PV3 在 0 ~ 0.2 s 工作在 1 000 W / m2,0.2 s 时刻光照 强度从 1 000 突变为 800 W / m2。 图 9a) ~ 9c) 分别 如图 10 所示,0.3 s 投入均衡器后,PV1 和 PV2 电压和电流分别为 29 V,7.35 A,功率为213.15 W, 这说明 PV1 和 PV2 在投入均衡器以后均工作在最 大功率点。 PV3 两端电压和电流为 27.8 V,6.1 A, 功率为 169.58 W。 3 块电池板总功率为595.88 W。
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