高频隔离型两相-单相贯通牵引供电装置及其控制策略

A High Frequency Isolated Two-phase to Single-phase Advanced Traction Power Supply Device and Its Control Strategy

基于电力电子技术的贯通牵引供电系统为同时解决负序电能质量与电分相问题提供了契机,然而,现行贯通改造方案依然存在功率密度低、改造成本高等问题。为此,文中提出一种高频隔离型两相-单相贯通牵引供电装置及其控制策略,所提装置在充分利用既有两相牵引变压器的基础上,采用三端口高频隔离型直流变换器连接输入输出侧,减小装置体积的同时提升系统功率密度,有效降低贯通系统改造成本。此外,针对贯通牵引供电装置内存在的电能质量问题,提出一种二次纹波消除与功率均分控制策略,在有效抑制直流侧二次纹波与负序电能质量问题的同时,进一步减小了装置直流侧电容容值的选型,最高可达94.95%。最后,通过仿真与实验验证所提装置及其控制策略的可行性与可靠性。

Advanced traction power supply device based on power electronics technology provides an opportunity to solve the problem of negative sequence power quality and electric phase separation.However,there are still problems of low power density and high transformation cost in the existing schemes.Therefore,an advanced traction power supply device that is high-frequency isolated and converts two-phase to single-phase.On the basis of making full use of the existing two-phase traction transformer,a triple-port high frequency isolated DC converter is used to connect the input and output sides to reduce the size and the transformation cost of the device.Moreover,a control strategy of secondary ripple transfer offset and power equalization is proposed for the structural characteristics of the device,which effectively suppresses the secondary ripple and negative sequence power quality problems on the DC side,and the capacitance value of the DC side of the device is further reduced,up to 94.95%.Finally,the feasibility and reliability of the proposed device and its control strategy are verified through simulation and experiment.