Electric Power ›› 2019, Vol. 52 ›› Issue (11): 100-106.DOI: 10.11930/j.issn.1004-9649.201809077

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Novel Flexible Excitation System Based on Multilevel Topology Technology

WU Kuayu1, ZHANG Jiancheng1, WU Long2, HAN Bing2, FANG Le1, LU Cencen1, XIONG Hongtao1   

  1. 1. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310007, China;
    2. NR Electric Co., Ltd., Nanjing 211102, China
  • Received:2018-09-20 Revised:2019-07-31 Online:2019-11-05 Published:2019-11-05

Abstract: Based on the development trend of the next generation power system, a novel flexible excitation system is designed based on three-level voltage source converter, and a matching five-level DC chopping circuit is proposed. An analysis is made of the controlling mode and performance of two DC chopping circuits with excitation current 6-IGBT or 3-IGBT. A simulation model of flexible excitation system is built based on PSCAD. The feasibility of the flexible excitation system with proposed five-level chopping topology and the control performance advantage over conventional self-shunt excitation are analyzed and verified.

Key words: multilevel topology, flexible excitation, three-level voltage source converter, five-level chopper

CLC Number: