Key Measure for Monopol/Bipole Blocking in UHVDC Project

doi:10.3969/j.issn.1000-7229.2015.09.019

Abstract

Abstract:

UHVDC project has been widely applied in power system because of its high-capacity and long transmission distance. However, the forced outage of monopole/bipole in DC system seriously affects its safe operation. According to the potential risk of the DC system, this paper studied the optimization of main wiring scheme, the restart logic of DC line, the automatic transformation scheme of metallic return, the differential protection action sequence of bipolar neutral bus and the protection configuration of DC filter in UHVDC transmission projects, from aspects of main circuit wiring mode, control & protection strategy, etc. Then, the key measure was proposed to prevent monopole/bipole blocking in UHVDC transmission projects. Finally, the effectiveness of the proposed measure was verified by real-time digital simulation analysis and engineering application. The research results have the practical guidance significance to improve the reliability of DC system and the design level of DC project.

Key words: UHVDC, monopole/bipole blocking, control strategy, protection sequence

CLC Number:

TM 722

LU Yajun, PU Ying, MA Yulong, SONG Shengli, LYU Pengfei. Key Measure for Monopol/Bipole Blocking in UHVDC Project[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(9): 117-122.

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