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Improvement measures of 100 Hz protection in China Southern Power Grid
Author(s): 
Pages: 96-100
Year: Issue:  12
Journal: ELECTRIC POWER AUTOMATION EQUIPMENT

Keyword:  高压直流输电100Hz保护负序电压反时限;
Abstract: 为减小交流系统故障期间直流100 Hz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50 Hz/100 Hz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100 Hz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100 Hz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.
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