CAJ | 학술논문

为提高直流输电系统双极中性母线差动保护运行可靠性，针对双极中性母线差动保护性能存在缺陷，提出保护的改进方案。由于双极中性母线差动保护存在缺陷，曾导致多起单一元件故障引发高压直流输电系统单、双极强迫停运事件。结合具体停运事件，对双极中性母线差动保护性能进行分析，包括：1)保护引入非电量信号的必要性及方式；2)双极运行工况下，保护经控制极判据开放的逻辑以及闭合双极中性母线接地开关的动作策略。根据分析结果，提出保护的改进方案，保护改进方案在提高保护运行可靠性的同时，兼顾了改善直流输电系统运行维护工作的效率。目前，改进方案已在多个高压直流输电系统中实施，采用该方案后，双极中性母线差动保护运行情况良好。
위제고직류수전계통쌍겁중성모선차동보호운행가고성，침대쌍겁중성모선차동보호성능존재결함，제출보호적개진방안。유우쌍겁중성모선차동보호존재결함，증도치다기단일원건고장인발고압직류수전계통단、쌍겁강박정운사건。결합구체정운사건，대쌍겁중성모선차동보호성능진행분석，포괄：1)보호인입비전량신호적필요성급방식；2)쌍겁운행공황하，보호경공제겁판거개방적라집이급폐합쌍겁중성모선접지개관적동작책략。근거분석결과，제출보호적개진방안，보호개진방안재제고보호운행가고성적동시，겸고료개선직류수전계통운행유호공작적효솔。목전，개진방안이재다개고압직류수전계통중실시，채용해방안후，쌍겁중성모선차동보호운행정황량호。
In order to improve the bipolar neutral bus differential protection reliability, the improvement measure of protection is proposed according to the existed deficiency. The bipolar neutral bus differential protection performance exists deficiency, which has led to monopole or bipolar forced outage event by one component fault. The performance of bipolar neutral bus differential protection is analyzed combining with actual forced outage events, which includes:1) the necessity and way of non-electricity signals adopted by protection; 2) the protection logic of blocking by control pole criterion and operating strategy of closing NBGS in the case of bipolar operation. According to the analysis results, the improvement measure of protection is proposed. The measure can be not only improve protection reliability, but also increase the efficiency of HVDC maintenance work. At present, the measure is implemented in multiple HVDC system, and then the bipolar neutral bus differential protection of these HVDC system operates well after adopting the measure.