Reliability Analysis on Redundant Configuration of Protective Relayings for HVDC Power Transmission System
Reliability Analysis on Redundant Configuration of Protective Relayings for HVDC Power Transmission System
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作者：
Wang Ming-xin
针对高压直流输电系统对继电保护可靠性的要求，基于串并联结构不可修系统可靠性分析原理，建立了几种典型冗余配置方案的可靠性模型，并对各种冗余配置方式的可靠性进行了比较，提出了工程上常用的两种保护配置方式，即“三取二”方式和全重复方式，通过可靠性和经济性的综合比较，得出“三取二”配置方式是直流输电系统保护冗余的较好选择，同时，建议采用三套测量回路和输出回路与保护装置的“二取三”冗余配置相匹配，以提高高压直流输电系统保护的整体可靠性。
In the light of the requirement to reliability of protective relayings for HVDC power transmission system,the reliability models for several typical redundant configuration schemes are built based on the principle of reliability analysis for unrepairable systems with the structure of series-parallel connection,and the reliability of various redundant modes are compared.Two protection configuration modes that are often applied in engineering,namely the "two out of three" mode and full duplication mode,are mainly analyzed,and by means of comprehensive comparison in reliability and economy following conclusion is obtained that the "two out of three" configuration mode is a better choice for protective redundancy of HVDC power transmission system.Meanwhile,it is suggested to use three sets of measuring circuits and output circuits to match up with "three out of two" redundant configuration of protective relayings to enhance global reliability of protection for HVDC power transmission system.