In order to effectively detect the positive sequence and negative sequence currents in electrified railway power supply,a new detection method based on FBD(Fryze-Buchholz-Depenbrock)is proposed. Taking traction power supply system with Scott transformer as the research object,the vector of positive and negative sequence currents between primary side and secondary side is obtained. Then by generating fundamental positive and negative sequence reference voltages by phase-locked loop(PLL),with the reference voltage and currents,the equivalent conductance can be acquired,and then the conductance i...
