一种优化的模块化多电平换流器均压控制方法
An Optimized Voltage Balancing Method for Modular Multilevel Converter
摘要: 模块化多电平换流器(Modular Multilevel Converter, MMC)具有高度的模块化结构，输出电平数高，能适应不同的电压等级和功率水平，不需要专门的滤波装置，非常适用于高压大功率的柔性直流输电场合。在模块化多电平变换器中，桥臂电容彼此之间不存在相互关联，对电容电压的均衡控制是保证电力系统稳定可靠运行的重要条件，本文在排序法的基础上提出了一种优化电容电压均衡控制方法，优化控制不需要时刻对电容电压进行排序，大大提高了处理器的运算速度，降低了系统损耗。在PSCAD/EMTDC中搭建21电平的MMC仿真模型，对控制策略的有效性进行验证，仿真结果表明采用的优化均压方法能够实现电容电压均衡，同时降低了系统的开关频率。
Abstract: The modular multilevel converter has high modular structure, high output level, can adapt to different voltage levels and power levels, and does not require special filter devices. It is very suitable for high voltage and high-power flexible DC transmission. In the modular multilevel converter, the bridge arm capacitance is not interrelated with each other, and the balanced control of the capacitance voltage is an important condition to ensure the stable and reliable operation of the power system. In this paper, an optimal capacitor voltage equilibrium control method was proposed on the basis of the sorting method. The optimization control did not need to sort the capacitor voltage at any time, greatly improved the processing speed of the processor and reduced the loss of the system. The 21 level MMC simulation model was built in PSCAD/EMTDC to verify the effectiveness of the control strategy. The simulation results show that the optimized mean voltage method can achieve the balance of capacitor voltage and reduce the switching frequency of the system.
文章引用：刘英杰, 宋吉江, 牛轶霞. 一种优化的模块化多电平换流器均压控制方法[J]. 电气工程, 2018, 6(2): 189-198. https://doi.org/10.12677/JEE.2018.62022

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