基于故障二次重构法的直流系统交流串扰检测技术

AC crosstalk voltage detection technology based on fault secondary reconstruction method

在电力系统中,交流电窜入变电站直流系统往往具有严重的破坏性。针对母线对地电容和交流串扰电压难以测量的问题,提出一种新型的测量方法--故障二次重构法,即通过向变电站直流系统母线投切两个大小不同的电容元件,构造一个新的电路,根据测量投切电容上的电流信号求出母线对地电容和交直流电缆间的绝缘电阻,进一步求出交流串扰电压。最后通过实验仿真验证了方案的可行性。

In power systems,the passage of alternating current into a DC loop is often highly destructive.Aiming at the problem that the bus-to-ground capacitance and AC crosstalk voltage are difficult to measure,a new measurement method-fault secondary reconstruction method is proposed,that is,by switching two capacitive elements of different sizes to the DC system bus of the substation,a new circuit is constructed,and the insulation resistance between the busbar-to-ground capacitance and the AC and DC cable is found according to the current signal on the switching capacitor,and the AC crosstalk voltage is further obtained.Finally,the feasibility of the scheme is verified by experimental simulation.