基于故障信号自同步的有源配电网短路故障定位方法

Fault location method based on self-synchronization using fault signal for active distribution network

为实现含有分布式电源的有源配电网的故障定位,根据有源配电网电压偏移量的限制,分析分布式电源提供最大短路电流与系统短路电流之间的关系,以及有源配电网非故障区段与故障区段两侧开关短路电流的关系,提出利用线路区段两侧电流幅值比较和相位比较相结合的有源配电网故障定位方法。为避免安装额外的同步时钟,利用故障电流信号作为同步信号。最后通过MATLAB/Simulink对提出的算法进行仿真验证,结果证明采用该方法可以实现有源配电网故障定位。

In order to realize the fault location for active distribution network, the relationship between the maximum short-circuit current provided by distributed electric resource and the current provided by the system, as well as the relationship of the short-circuit current on both sides of the non fault section and the fault section, is analyzed. And the capacity of the distributed electric resource satisfy to the limitation of the voltage offset. The fault section can be located by the comparison of the current amplitudes and the phase of both side of the feeder section. In order to avoid installing additional synchronous clock, the fault current signal is used as the synchronous signal. Finally, the method is proved to locate fault section successfully by MATLAB/Simulink.