SVC对故障分量方向保护影响的分析  

Analysis of the impact of fixed SVC on fault component directional protection

作　　者：刘超[1] 杨永明[1] 熊小伏[1] 欧阳金鑫[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《电力系统保护与控制》2011年第19期110-114,120,共6页Power System Protection and Control

基　　金：国家自然科学基金(50777068);重庆大学输配电国家重点实验室资助项目(2007DA10512709202)

摘　　要：SVC为电网安全、稳定、高效、灵活运行控制提供调节手段,其接入电网将改变线路电气量从而对线路保护产生影响。分析了SVC阻抗特性,依据故障分量方向保护的动作原理,对SVC接入电网后,正、反向故障时保护背端等值阻抗的变化规律进行研究,得出SVC接入后故障分量方向保护最大灵敏角偏移量与SVC补偿比的关系式,为实际工作中定量评估SVC接入对故障分量方向保护影响大小提供了计算依据。通过算例分析,表明容性补偿时对灵敏角的影响较之感性补偿时的偏差更大。SVC provides a controlling method for secure, stable, efficient and flexible operation of power grid, and it affects line protection by changing electrical quantities after accessing grid. Impedance characteristics of SVC is analyzed, and the variation patterns of the back side equivalent impedance as fault in front and rear protection on the basis of fault component directional protection principle after SVC accessing grid are studied. A formula is proposed on the relationship between maximum sensitivity angle of fault component directional protection and compensation ratio of SVC, which provides basis for quantitative estimation of the influence of SVC on fault component directional protection in the actual work. Example shows that the influence on sensitivity angle by capacitive compensation shows bigger deviation than that by inductive compensation. This work is supported by National Natural Science Foundation of China （No. 50777068）.

关 键 词：SVC 故障分量 方向保护 灵敏角 偏移量 

分 类 号：TM772[电气工程—电力系统及自动化]