Volume 38, Number 3, June 2020
|Page(s)||533 - 539|
|Published online||06 August 2020|
Photovoltaic Equalizer Based on Single-Input Multi-Output Push-Pull Converter
School of Automation, Northwestern Polytechnical University, Xi'an 710072, China
2 Datang Northwest Electric Power Test&Research Institute, Xi'an 710018, China
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%.
Key words: photovoltaic power generation / photovoltaic equalizer / partial shadowing / single-input multi-output structure / push-pull converter
关键字 : 光伏发电 / 光伏均衡器 / 局部阴影 / 单输入多输出 / 推挽变换器
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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