DC transformer requirements and fault operation analysis in PV medium voltage DC power collection system

The Journal of Engineering

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[1] Electric Power Research Institute of Yunnan Power Grid Co., Ltd, Kunming, People's Republic of China;School of Electrical Engineering, Chongqing University, Chongqing, People's Republic of China;Jiangsu Provincial Key Laboratory of Smart Grid Technology & Equipment, Nanjing, People's Republic of China;School of Electrical Engineering, Southeast University, Nanjing, People's Republic of China;School of Foreign Languages, Kunming University, Kunming, People's Republic of China;

关键词: photovoltaic power systems;    power grids;    DC-DC power convertors;    power transformers;    DC collection system;    PV DC module;    PV modules exist;    fault operation principle;    PV MVDC power collection system;    DC transformer requirements;    fault operation analysis;    PV medium voltage DC power collection system;    PV medium-voltage DC power collection system;    traditional AC collection system;    future PV applications;   

DOI  :  10.1049/joe.2019.0798

来源: publisher

【 摘 要 】

The large PV medium-voltage (MV) DC power collection system is more efficient than the traditional AC collection system, which provides an alternative for future PV applications. As one of the core components of the PV MVDC power collection system, key techniques of DC transformer are presented here in detail, including the technical requirements, and fault operation analysis in the DC collection system. When part of the PV DC module in the low-voltage (LV) side of DC transformer fails and bypassed, the DC collection system continues working normally with only part of power lost. When the MV side of DC transformer is shorted, all the PV modules exist and the collection system splits without ride-through techniques. The fault operation principle of DC transformer in PV MVDC power collection system is verified by simulations.

【 授权许可】

CC BY