摘要
针对高压直流输电系统在不同故障情况下线路两端暂态电流幅值与方向变化的不同问题,提出一种新型极性比较式纵联保护,充分考虑故障暂态过程中分布电容的影响,采用故障分量分析流经线路两端保护处电流的变化,利用两端暂态电流波形的差异度并根据位移偏差量和电流变化乘积项的概念提出相关判据,有效识别区内外故障。仿真试验表明,该方案较易实现与整定,可靠性高。
A new pilot protection based on polarity comparison is proposed through amplitude and direction difference comparison of transient current at both ends.In order to reduce the interference of load current,the fault components are adopted to analyze current changes.It considers the influence from distributed capacitance during the fault transient period.Utilizing the dissimilarity of transient current waveforms at two ends,displacement deviation and product term of current changes are introduced.Thereby,the relevant criterion is proposed to distinguish the internal and external faults effectively.Simulation results show that the proposed scheme is easy to implement with high reliability.
出处
《水电能源科学》
北大核心
2013年第6期202-204,32,共4页
Water Resources and Power
基金
国家自然科学基金资助项目(51177066)
关键词
高压直流输电
暂态电流保护
位移偏差量
变化乘积项
过渡电阻
HVDC
transient current protection
displacement deviation
product term of changes
transition resistance
