摘要
基于电压源换流器的直流配电系统故障线路电流因电容放电而迅速上升,换流器中大量电力电子器件使系统对故障隔离时间提出较高的要求,而故障限流器接入直流系统不仅能限制直流侧故障线路电流,还能限制交流侧以及换流器中的电流。从系统整体限流的角度出发,提出一种基于全控型晶体管的新型限流模块,根据两极短路的故障暂态过程对限流原理进行详细分析,并给出限流模块参数选择的一般原则及其理论计算方法。最后,基于PSCAD/EMTDC仿真平台,通过大量的仿真测试、对比,验证该限流方案的有效性。
The fault current of DC line rises rapidly because of the discharge of capacitor after the occurrence of fault in DC distribution network based on voltage source converters（VSC）.The fragile electronic devices in the inverter require the DC breaker operate faster than the traditional AC breaker.With regard to the application of fault current limiter（FCL）in DC systems,not only the DC-side fault current but also the current at the AC side and in the converter itself should be limited during a DC fault.Considering the whole-system current-limiting capability,a new current limiter based on full-controlled transistor is proposed.According to the fault transient process of bipolar short-circuit fault,the current-limiting principle is analyzed in detail.Meanwhile,the selection standard and theoretical calculating method of the resistor are also discussed.Finally,simulation tests based on PSCAD/EMTDC are carried out to verify the effectiveness of this limiting scheme.
出处
《电力系统自动化》
EI
CSCD
北大核心
2017年第12期118-123,共6页
Automation of Electric Power Systems
基金
中国-丹麦政府间科技合作项目(2014DFG72620)
关键词
直流配电网
故障隔离
限流原理
参数选择
DC distribution network
fault isolation
current limiting principle
parameter selection
