摘要
为减小交流系统故障期间直流100Hz保护动作的概率,利用PSCAD/EMTDC仿真分析软件,就阀故障和交流系统故障时直流线路50Hz/100Hz电流特性进行了分析,研究了提高保护定值或延长保护动作延时、采用反时限特性、利用附加判据区分交流故障和阀故障、调整直流100Hz保护配置原则4种措施的可行性、使用后的效果及局限性。提出100Hz保护主要作为交流系统故障的后备保护,动作时间与交流系统故障清除时间相配合的原则。推荐的改进方案已用于天广、高肇、兴安直流工程。
To reduce the possibility of 100 Hz protection action during AC system faults,the characteristics of 50 Hz/100 Hz DC line current are analyzed for valve faults and AC system faults using PSCAD/EMTDC software. The feasibility,effectiveness and limitation of four improvement measures are studied： raise protection settings or prolong protection delay;apply inverse time limit; use additional criterion to distinguish valve fault from AC system fault;and adjust 100 Hz protection configuration principle. It is suggested that,100 Hz protection is mainly used as backup protection of AC system fault and the release time should match with the clearance time of AC system fault. The improved scheme has been applied in TSQ（TianGuang）,GGI（GaoZhao）,and GGII（Xiag＇an） HVDC projects.
出处
《电力自动化设备》
EI
CSCD
北大核心
2007年第12期96-100,共5页
Electric Power Automation Equipment
