基于PQ下垂控制逆变器并联技术的列车辅助供电系统研究

摘要

针对现有DC600V列车辅助供电系统在可靠性及系统冗余上的不足,研究了基于逆变器并联技术的列车辅助供电系统。分析了现有的逆变器并联技术,结合列车辅助供电系统多逆变器、长距离、高可靠性及大系统冗余等特点,确定了基于PQ（有功和无功）下垂控制逆变器并联技术的列车辅助供电系统方案;分析了在dqo坐标系下的PQ下垂控制算法,结合MATLAB/Simulink仿真模型对所构建的逆变器并联系统进行仿真,并结合实验系统进行了两台辅助逆变器并联的实验。仿真及实验结果表明供电系统在负载变化及单个动力丢失的情况下仍可正常工作%In this paper,the inverter parallel technology is applied in the DC600V train auxiliary power system,which is able to improve its reliability and redundancy.The existing inverter parallel technologies and the train auxiliary power system＇s characters such as multi-inverters,long-distance, high reliability and system redundancy,etc.are analyzed.A solution based on PQ（active power and reactive power） droop control inverter parallel technology is proposed for the DC600V train auxiliary power system.Then,in dqo coordinates the PQ droop control algorithm is analyzed.A MATLAB/Simulink emulation model is used for testing the auxiliary inverter parallel system as well as an experimental system with two auxiliary inverters paralleled.Simulation and experimental results verify that the power system still operate normally after load changed or power lost,which reveals that the constructed inverter parallel system can fully qualify the high reliability and system redundancy of train auxiliary power system.