含统一潮流控制器输电线路断路器保护研究

Circuit Breaker Protection of 500 kV Transmission Line with UPFC

统一潮流控制器(unified power flow controller,UPFC)作为一种功能强大的柔性交流输电设备,目前在国内电力系统中得到进一步推广并逐步应用在500 k V电压等级系统中,含UPFC输电线路在一个半接线方式下的断路器保护将面临新的应用问题。文中结合苏州南部电网500 k V UPFC示范工程实施,分析500 k V含UPFC系统对于断路器保护装置特殊功能需求,针对不同接线方式提出断路器保护适应性解决措施,指出不一致运行状态下断路器保护与UPFC控制保护配合策略,可有效避免断路器保护带UPFC重合闸的情况,从而为UPFC接入后系统稳定可靠运行奠定基础。

As a powerful flexible AC transmission equipment,Unified Power Flow Controller（ UPFC） has been further extended in the domestic power system and gradually applied in the 500 k V level system,circuit breaker protection in the 3/2 connecting mode of transmission line with UPFC will face new application problems. Based on the Southern Su Zhou power grid500 k V UPFC demonstration project,this paper analysis the circuit breaker protection device＇s special functional requirements in power system with UPFC. According to different connecting modes,the adaptability of circuit breaker protection and the combination strategy of circuit breaker protection and UPFC control protection in three phase inconsistent operation are proposed. All of this can effectively avoid the reclosing of circuit breaker protection with UPFC. The research improves operation reliability of UPFC system.