基于双有源桥式DC-DC变换器的电力电子牵引变压器的电压平衡控制

提出一种基于双有源桥式(DAB)DC-DC变换器的电力电子牵引变压器(PETT)的电压平衡控制策略,分析这种控制策略的作用机理,并提出一种PETT的起动控制方法。建立单个DAB的数学模型、DAB并联系统的整体模型以及DAB并联系统的电压平衡控制模型,以方便、有效地进行输出电压控制器、输入电压平衡控制器的设计。基于两单元PETT实验平台,开展仿真和实验研究,仿真和实验结果一致,变换器的稳态和动态控制性能良好。仿真和实验结果验证了所提方法的正确性和有效性。

Voltage Balance Control of a Power Electronic Traction Transformer Based on Dual Active Bridge DC-DC Converters

In this paper, a voltage balance control strategy based on dual active bridge (DAB) DC/DC converters in a power electronic traction transformer (PETT) is proposed. The operation mechanism of this strategy is analyzed and a PETT starting control method is proposed. In order to design the output voltage controller and input voltage balance controller conveniently and effectively, the mathematical models are set up, including the model of a single DAB converter, the overall model of the parallel DAB converters related to output voltage control loop, and the model of the parallel DAB converters related to input voltage balance control loop. The simulation and experiment are based on a two-cell low-voltage PETT prototype. The experimental results are consistent with the simulation results, including the steady-state and dynamic performance. Simulation results and experiment results all verify the effectiveness and correctness of the proposed algorithms.