基于桶排序和电压离散度阈值的MMC子模块电压均衡算法  

A Voltage Balancing Algorithm for MMC Submodules Based on Bucket Sorting and Voltage Dispersion Threshold

作　　者：周登波[1] 宋述波[1] 周勇 陆启凡 ZHOU Dengbo;SONG Shubo;ZHOU Yong;LU Qifan(Guangzhou Bureau of CSG EHV Power Transmission Company,Guangzhou 510663,Guangdong,China)

机构地区：[1]中国南方电网超高压输电公司广州局,广东广州510663

出　　处：《电网与清洁能源》2022年第9期105-111,共7页Power System and Clean Energy

基　　金：中国南方电网超高压输电公司科技项目(010100KK52180007)。

摘　　要：传统的MMC-HVDC子模块电压均衡冒泡排序算法存在时间复杂度高、子模块投切频繁的缺点。该文提出了一种结合桶排序算法与子模块电容电压离散度阈值的MMCHVDC子模块电容电压平衡算法。引入电压离散度阈值,将当前周期的电容电压序列与阈值进行对比,形成高压、中压、低压3组;根据桶排序的思路对3组电压序列进行区间分割;依据桥臂电流方向确定不同区间子模块的投切次序。最后通过MATLAB和PSCAD/EMTDC进行仿真,验证了所提算法在降低时间复杂度和功率模块开关频率上的有效性。The traditional voltage balancing bubble sorting algorithm of MMC-HVDC sub modules has the disadvantages of high time complexity and frequent switching of submodules.To this end,this paper proposes an MMC-HVDC submodules capacitor voltage balance algorithm that combines the bucket sorting algorithm and the submodules capacitor voltage dispersion threshold.The voltage dispersion threshold is introduced,and the capacitor voltage sequence of the current period is compared with the threshold value to form three groups of high voltage,medium voltage and low voltage.Second,the three groups of voltage sequences are divided according to the idea of bucket sorting.Finally,the switching order of submodules in different sections is determined according to the bridge arm current direction.In this thesis,the proposed algorithm is simulated by MATLAB and PSCAD/EMTDC,and the effectiveness of the method in reducing the time complexity and power module switching frequency is verified.

关 键 词：模块化多电平换流器 电压均衡算法 桶排序 电压离散度阈值 开关频率 

分 类 号：TM726[电气工程—电力系统及自动化]