限流式统一潮流控制器参数设计及设计实例

限流式统一潮流控制器（unified power flow controller with fault current limiting,UPFC-FCL）可以在系统发生短路故障时有效保护UPFC侧装置不受短路电流的冲击而损坏.在结合限流式UPFC工作原理的基础上,给出装置参数的设计方法,根据最大补偿容量和额定电流确定最大补偿电压,从而确定直流母线额定电压,根据补偿容量指标确定滤波电感的取值范围,按照短路电流水平设计限流电感.依据上述设计方法给出了额定电压为10 kV,最大补偿容量为1 MVA的装置设计实例,确定了串联侧注入系统的最大补偿电压、直流母线额定电压、并联侧及串联侧滤波电感、限流器模块限流电感等.PSCAD/EMTDC的仿真结果证明了文中设计的有效性和实用性.

Parameters Design and Example of Unified Power Flow Controller with Fault Current Limiting

The unified power flow controller with fault current limiting （UPFC-FCL） can protect UPFC from being damaged by short-circuit current when a short-circuit fault occurs in power system. Based on UPFC working principle, a parameter design method was proposed. The maximum compensation voltage was determined according to the maximum compensation capacity and rated current, and then the rated DC bus voltage was fixed. The value range of filter inductance was proposed based on the compensation capacity target, and current-limiting inductance was designed based on short-circuit current level. According to the design method above, a design example was presented that the rated voltage was 10 kV and the maximum compensation capacity was 1 MVA, and then the maximum compensation voltage which came from series converter, the rated voltage of DC bus, the filter inductance of series converter and shunt converter, the current-limiting inductance were determined. The PSCAD/EMTDC simulation results demonstrate that the design is effective and practical.