单台Yn,d11式变压器构成的新型同相供电系统

New Co-phase Power Supply System Based on Yn,d11 Wiring Autotransformer

单相工频牵引供电系统对电力系统造成了三相负载不平衡、无功和谐波污染问题,同时对通信信号有严重的干扰,制约了高速、重载铁路的发展。针对单台接线式变压器,在BT供电方式的基础上,以三相三桥臂结构,将有源滤波器与Yn,d11接线变压器结合构成新型同相供电系统。根据瞬时无功功率理论,通过有功电流分离法实时检测谐波及无功电流,并结合平衡变换原理平衡负序。仿真证实平衡方式和检测控制方法正确,该系统方案可行。

Three phase load with unbalance, reactive power and harmonic pollution on power system are caused by traction power supply system of single phase working frequency, furthermore, the serious interference on communication signal and the development restriction for railway with high speed and heavy haul are carried out. Aiming to the single wiring transformer, based on BT power supply mode, a new co-phase power supply system is designed by combining the active filter, Yn,dl I wiring transformer as per three -phase three-bridge structure. In accordance with the instantaneous reactive power theory, harmonic and reactive currents can be detected in real time with active current separation method. Moreover, the negative is balanced by combining the principle of balance commutation. Finally, the proposed system is feasible according to the result that the simulation proves the correctness of balance mode and detecting control method.