Research of optimized sorting algorithm of capacitor voltage for MMC
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摘要: 根据模块化多电平换流器的运行原理，研究了传统电容电压排序算法导致器件开关频率增大的根本原因；为降低器件的开关频率，提高系统运行效率，提出了一种电容电压排序优化算法。该算法对传统排序算法进行了优化改进，给定3个电压参考值，将已投入的子模块电容电压值与参考值进行比较，判断是否继续保持投入状态。在Matlab中搭建了每相60个子模块的MMC电容电压排序优化算法仿真模型，仿真结果表明，该算法能显著降低功率器件的开关频率，减小换流器的功率耗损。Abstract: The paper researched primary cause of increasing of switching frequency of modular multilevel converter led by traditional capacitor voltage sorting algorithm according to operation principle of the converter. It proposed an improved sorting algorithm of capacitor voltage in order to decrease the switching frequency and improve system running efficiency. The algorithm optimizes and improves the traditional sorting algorithm, gives three voltage references, and compares switched capacitor voltage in sub-module with the references, so as to judge whether the switched sub-module is going to keep running in the next time. It constructed a MMC simulation model contained 60 sub-modules with the optimized algorithm in Matlab. The simulation results verify that the optimized algorithm can significantly reduce switching frequency of power devices, and decrease power consumption of the converter.
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