220 kV 限流式统一潮流控制器设计

Design of 220 kV Unified Power Flow Controller with Fault Current Limiting

摘要:

限流式统一潮流控制器( UPFC － FLC) 通过故障限流器与统一潮流控制器的结合，组成了能有效控制系统短 路电流的新型 FACTS 装置。针对 220 kV 线路，为缩短限流时间，减小装置体积和成本，实现更高效的短路故障切除， 提出了一种采用饱和型自耦变压器作为串联变压器，二次侧限流支路采用 RLC 串联谐振电路的新型限流式 UPFC。 对其拓扑结构、限流过程进行了分析，设计了装置的主要参数，仿真结果表明新型限流式 UPFC 相较于常规型在体积 成本更小的基础上具有更佳的限流效果。

Abstract:

The unified power flow controller with fault current limiting ( UPFC － FLC) combines a fault current limiter with a unified power flow controller to form a new FACTS device that can effectively control short － circuit current of the system． For 220 kV voltage class，in order to shorten the current － limiting time，reduce the device volume and cost and achieve more efficient short － circuit fault removal，a new UPFC － FLC is proposed，that is，taking saturated autotransformer as series tansformer and adopting RLC series resonant circuit for the secondary side current limiting branch． Its topological structure and current limiting process are analyzed，and the main parameters of the device are designed． The simulation results show that the new UPFC － FLC has a better current limiting effect than the conventional one in terms of smaller volume cost．