一种软起动电源系统及其逆变器的无线并联控制

提出一种应用于轨道机车辅助电源的三相交流电源系统,由位于各车厢的逆变器并联构成。各逆变器独立带本车厢负载变频软起动,达到稳态运行后通过无互联线并联控制实现并联运行。为有效抑制逆变器并联瞬间电流冲击,提出基于空间矢量控制(space vector control,SVC)特性和依据输出功率母线电压相位的热并机准同步控制,结合下垂法均流算法,该控制改善了稳态均流性能和动态过程可靠性。分析并机电感参数对逆变器及其并联系统特性的影响,并给出设计原则。搭建两台逆变器组成的并联系统并进行动态和稳态实验,验证了所提出系统及控制的可行性。

An AC Power Supply System of Inverters With Variable Frequency Starting and Wireless Control for Redundant Parallel Operation

A three-phase power supply used in train’s auxiliary power,which consisted of inverters distributed in every car,was proposed.The inverters mentioned are soft-started with local load at variable output frequency and operated in parallel in steady state with a novel wireless parallel control.A quasi-synchronization control method based on the space vector control(SVC) and referring the phase angle of the shared AC bus was proposed to effectively suppress the inrush currents among the inverters during hot plug.The current sharing in steady state as well as the reliability in dynamic process were improved greatly with combined droop and the quasi-synchronization method.The influence of the parallel inductors on parallel operation performance was analyzed in detailed with the design principle of the inductor given.A prototype system configured with two inverters in parallel was built with experiments in both the dynamic and steady states.Experimental results verify the validity of the proposed system and control.