基于拓扑动态调整的分段接线故障限流控制方案

A fault current limiting control scheme for sectionalized connection mode based on dynamic topology adjustment

随着电网的快速发展,短路电流超标问题日益突出,制约电网安全稳定运行。针对现有短路电流限制方法的不足,提出了分段接线方式下基于拓扑动态调整方法的拓扑快速解列和自动恢复限流方案。为满足故障限流控制系统的速动性要求,从提高数据处理速度和降低链路传输延时的角度设计了基于FT3通信的控制系统架构,提出基于卡尔曼状态估计的故障快速识别和相控开断方法及其实现方案。最后通过RTDS试验对控制系统进行验证,结果表明短路电流限制方案能够快速提取故障特征量,在短路电流的第一个周波内快速完成解列,确保在常规断路器燃弧前限流起效。

With the rapid development of the power grid,the overhigh short-circuit current becomes increasingly prominent,restricting the safe and stable power grid operation.Because of the shortcomings of the existing shortcircuit current limiting methods,fast topology splitting and self-recovery current limiting scheme based on dynamic topology adjustment method in sectionalized connection mode is proposed.To meet the quickness of fault current limiting control system requirement,a control system architecture scheme based on FT3 communication is designed to increase data processing speed and reduce link transmission delay.A fast fault identification and phase control fault interruption method and its implementation scheme based on Kalman state estimation are proposed.Finally,the control system is verified by RTDS test.The results show that the short-circuit current limiting control scheme can quickly extract fault features and complete the splitting in the first cycle of short-circuit current to ensure the effectiveness of current limiting before conventional circuit breaker arcing.