内容：
针对传统电容电压平衡方法计算量大、器件开关频率较高的问题,提出一种适用于MMC-HVDC系统的直流电容电压新型优化平衡方法。首先分析了传统排序算法存在的问题并给出其优化方法,提出采用随机选择算法进行MMC均压排序,以大幅度地优化排序效率。在此基础上,提出基于随机选择算法的电容电压优化平衡方法,根据引入的重新排序判据,使MMC控制器在电容电压变化不大的控制周期避免排序并保持触发脉冲不变,在需要排序的控制周期采用效率更高的随机选择算法排序,从而既进一步减少了控制器运算量,又能有效降低换流阀损耗。最后通过Matlab/Simulink仿真验证了所提优化平衡方法的可行性和有效性。 Aiming at the problem that the traditional capacitance voltage balance method is large and the switching frequency is high, a new method of optimizing the DC capacitor voltage suitable for MMC-HVDC system is proposed. Firstly, the existing problems of the traditional sorting algorithm are analyzed and the optimization method is given. The random selection algorithm is used to optimize the efficiency of the sorting efficiency. On the basis of this, a capacitor voltage optimization method based on stochastic selection algorithm is proposed. According to the reordering criterion introduced, the MMC controller avoids sequencing and keeps the trigger pulse constant in the control cycle with little change in capacitance voltage. Of the control cycle using a more efficient random selection algorithm, which will further reduce the amount of control the controller, but also effectively reduce the converter valve loss. Finally, the feasibility and validity of the proposed method are verified by Matlab / Simulink simulation.

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