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HE Xinlu,ZHU Tianhua,GUAN Tong,WANG Feng,ZHUO Fang.Application of Multiple-input Converter in PV DMPPT Topology[J].JOURNAL OF POWER SUPPLY,2019,17(2):117-123
Application of Multiple-input Converter in PV DMPPT Topology
Received:June 08, 2017  Revised:January 28, 2019
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DOI:10.13234/j.issn.2095-2805.2019.2.117
Keywords:photovoltaic(PV)  distributed maximum power point tracking(DMPPT)  multiple-input converter  differential power processing structure
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HE Xinlu School of Electrical Engineering, Xi'an Jiaotong University, Xi'an , China
ZHU Tianhua School of Electrical Engineering, Xi'an Jiaotong University, Xi'an , China
GUAN Tong School of Electrical Engineering, Xi'an Jiaotong University, Xi'an , China
WANG Feng School of Electrical Engineering, Xi'an Jiaotong University, Xi'an , China fengwangee@xjtu.edu.cn
ZHUO Fang School of Electrical Engineering, Xi'an Jiaotong University, Xi'an , China
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Abstract:
      To solve the mismatch problem with a photovoltaic(PV) system caused by uneven illumination, shadow mas-king and aging of PV panels in the practical environment, the structure of distributed maximum power point tracking(DMPPT) is one of the efficient methods. In this paper, a multi-input converter topology based on differential power structure along with a time-sharing control strategy is proposed for the structure of PV DMPPT. On one hand, this topology and control strategy can completely eliminate the mismatch problem between PV panels with only one MPPT control unit, so that each PV panel outputs its ideal maximum power; on the other hand, this converter topology adopts a differential power structure, which has advantages such as reducing the power level requirements of the converter and improving the system voltage gain. The topology and control strategy are analyzed in detail, which are verified through simulations in MATLAB/Simulink. Simulation results show that each PV panel can still operate at its individual ideal maximum power point even under uneven illumination condition as well as with sudden illumination change.
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