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无工频牵引变压器技术是实现高速列车轻量化的手段之一。该文首先分析了无工频变压器电力牵引传动系统前端级联H桥整流器的工作原理,以及开关状态和网侧电流对直流侧电容充放电的影响。针对级联H桥整流器电容电压平衡问题,为了实现负载严重不对称情况下直流侧电容电压快速平衡的控制目标,以传统的载波移相脉宽调制方法为基础,提出了一种基于电压补偿分量注入的载波移相脉宽调制算法。考虑负载不平衡度很大的恶劣情况,对该算法的电压补偿分量进行设计与定量计算,并针对该算法多个H桥级联拓扑的应用进行了理论扩展。计算机仿真和半实物实验都验证了该算法的有效性和正确性。
No power frequency traction transformer technology is one of the means to achieve lightweight high-speed train. This paper first analyzes the working principle of front-end cascaded H-bridge rectifiers without power frequency transformer traction drive system, and the influence of switching state and grid-side current on charging and discharging of DC side capacitors. Aiming at the problem of capacitor voltage balance of cascaded H-bridge rectifier, in order to achieve the control target of DC capacitor voltage fast balancing under severe load asymmetry, based on the traditional carrier phase shift PWM method, a voltage compensation component Injected carrier phase shift pulse width modulation algorithm. Considering the severe load unbalance, the voltage compensation components of the algorithm are designed and calculated quantitatively, and the application of multiple H-bridge cascaded topology in this algorithm is theoretically extended. Both the computer simulation and the semi-physical experiments verify the validity and correctness of the algorithm.