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LIU Yuanjun,DU Guiping,LI Jiajian,LEI Yanxiong,LAI Na.Status-quo and Prospect of Substation DC Power Systems[J].JOURNAL OF POWER SUPPLY,2020,18(3):86-94

Status-quo and Prospect of Substation DC Power Systems

Received:March 09, 2018 Revised:December 24, 2018

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DOI：10.13234/j.issn.2095-2805.2020.3.86

Keywords:substation DC power supply charging module current-sharing technology power factor correction

Fund Project:Applied Technology Research and Development Projects in Guangdong Province

Author	Institution	Email
LIU Yuanjun	School of Electric Power, South China University of Technology, Guangzhou , China
DU Guiping	School of Electric Power, South China University of Technology, Guangzhou , China
LI Jiajian	School of Electric Power, South China University of Technology, Guangzhou , China
LEI Yanxiong	School of Electric Power, South China University of Technology, Guangzhou , China
LAI Na	School of Electric Power, South China University of Technology, Guangzhou , China

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Abstract:

Substation DC power systems have been using high-frequency switching power devices since the 1990s, with a history of more than 20 years. At present, although there are already well-developed complete systems including GZDW series high-frequency switching DC power supplies, some problems still exist, such as high harmonic content, high failure rate of the charging module, and low-lever of intelligence. In addition, semiconductor devices have been developed to the third-generation wide-bandgap semiconductor devices, but the substation DC power supply system still stays at the application stage of the first-generation silicon devices and develops slowly as a whole. In this paper, the status-quo of substation DC power supply systems and each of their modules are studied, and the existing problems in key parts（e.g., high-performance charging modules, current-sharing technology, and power factor correction） are analyzed in detail. Finally, the prospect of new-generation substation DC power supply systems is proposed by combining the trend of the state-of-the-art technology.