混合性负载下动车组辅助逆变器控制方式优化

Optimization of EMU Auxiliary Inverter Control Mode Under the Mixed Load

由于变频空调的非线性,导致实际运行的辅助变流器在空调启动、变频的瞬间经常出现闭锁。基于阻抗比判据给出辅助逆变系统的稳定条件,通过合理分配辅助逆变器输出端的线性负载和非线性负载所占比重,达到减小辅助逆变器输出电压畸变率的目的。将改进的复合控制模型引入到传统的逆变器双闭环控制中,通过信号延迟对消(delay signal cancellation,DSC)变换算法分别跟踪补偿谐波电压的正负序分量。基于MATLAB及dSPACE半实物仿真平台搭建CRH2动车组辅助供电系统的仿真模型,仿真验证了在改进的复合控制下,大功率空调在短时间内启动、变频、关停所产生的冲击性对辅助逆变器的输出电压影响较小,表明改进的复合控制方式适用于各个类型的负载。

When the air-conditioner starts over or meets the situation of frequency conversion,the auxiliary inverter might shut down.The nonlinearity of the inverter air-conditioner causes this problem.This research gave the stable condition of the auxiliary inverter system based on the impedance ratio criterion.Moreover,it reduced the aberration rate of the output voltage by properly adjusting the proportion of the linear load and the non-linear load.In addition,this paper drew the optimized composite control model into the traditional double-loop control and followed positive and negative sequence components by using the delay signal cancellation(DSC) transformational algorithm.It constructed a simulation model of the CRH2 auxiliary power supply system based on MATLAB and dSPACE HIL simulation platform.The simulation test verified that high-power air conditioners in many situations,such as start,frequency conversion,and shut-down,had lower influence on the output voltage of the frequency conversion under the composite control.It shown that the optimized method is suitable for all kinds of loads.