Optimization Analysis for Two-out-of-Three Logic of DC Protection in UHV Zhongzhou Converter Station

doi:10.3969/j.issn.1000-7229.2015.02.017

Abstract

Abstract:

Two-out-of-three （2 of 3） logic is widely used in DC protection system of converter stations, because of its lower malfunction and rejection rate. There are different methods to implement two-out-of-three logic, according to different devices. Taking the DC system protection of Zhongzhou converter station and the non-electrical protection of converter transformer as research objects, this paper comprehensively analyzed the two-out-of-three logic of DC protection in Zhongzhou converter station, including analog value acquisition circuit, digital value acquisition circuit and trip circuit, combined with the realization way of two-out-of-three logic of DC protection in previous projects. Finally, the problems were found, and some improvement suggestions were proposed, which could provide some basis for the design of follow-up projects.

Key words: two-out-of-three logic, converter station, DC system protection, non-electrical protection of converter transformer

WANG Sen, ZHOU Xiaoyu, WU Ning, LIAO Huilian. Optimization Analysis for Two-out-of-Three Logic of DC Protection in UHV Zhongzhou Converter Station[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(2): 104-109.

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