A three-phase to single-phase modular multilevel converter based advanced co-phase traction power supply (MMC-ACTPS) system is an effective structure to address the concerns of phase splitting and poor power quality of the conventional electrified railway. Due to the large number of MMCACTPS system modules, I/O resources and computing speed have high requirements on processors. Moreover, the module capacitor balance is challenging because the sorting time is too long when the traditional sorting algorithm for voltage balance is used. To solve the above issues, a digital implementation scheme of flexible power control strategy for three-phase to single-phase MMC-ACTPS system based on field programmable gate array (FPGA), which has sufficient I/O resources, has been proposed. Due to the parallel execution characteristics of the FPGA, the execution time of the controller and the modulator can be greatly reduced compared with a digital signal processor (DSP) + FPGA or DSpace. In addition, an improved sorting algorithm is proposed to reduce the sorting time and the implementation steps are analyzed. Finally, simulation and experimental results are presented to demonstrate the effectiveness and correctness of the proposed control strategy.

中文翻译：

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基于FPGA的三相转单相MMC先进同相牵引供电系统灵活功率控制的数字实现

基于三相单相模块化多电平变流器的先进同相牵引供电（MMC-ACTPS）系统是解决传统电气化铁路分相和电能质量差问题的有效结构。由于MMCACTPS系统模块数量较多，I/O资源和计算速度对处理器的要求较高。此外，使用传统的电压平衡排序算法时，由于排序时间过长，模块电容平衡具有挑战性。针对上述问题，提出了一种基于具有充足I/O资源的现场可编程门阵列(FPGA)的三相转单相MMC-ACTPS系统灵活功率控制策略的数字化实现方案。由于FPGA的并行执行特性，与数字信号处理器（DSP）+FPGA或DSpace相比，控制器和调制器的执行时间可以大大减少。此外，提出了一种改进的排序算法来减少排序时间，并分析了实现步骤。最后，仿真和实验结果证明了所提出控制策略的有效性和正确性。