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中文摘要：
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。
英文摘要：
Transformerless technology is one of the realization of high-speed railway train lightweight. The operation principle of the front-end cascaded H-bridge rectifiers is analyzed, as well as switching states and the line current’s influence on DC-link capacitors’ charging and discharging. A carrier phase-shift PWM with voltage offset injection （CPSPWM-VOI） algorithm based on the conventional CPSPWM is proposed to balance DC-link capacitors’ voltages quickly in severe terrible application condition. Voltage offset component is designed and calculated quantitatively in a bad load imbalance degree. And the proposed algorithm is extended in multiple cascaded H-bridge rectifiers. The effectiveness and correctness of the CPSPWM-VOI algorithm are verified by the computer simulation and hardware-in-the-loop experiments.
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