模块化多电平换流器的电容均压算法比较及优化设计

SHI Shuhuai

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模块化多电平换流器的电容均压算法比较及优化设计

更新时间：2025-08-13

- 模块化多电平换流器的电容均压算法比较及优化设计
- Automation of Electric Power Systems Vol. 41, Issue 13, Pages: 150-155(2017)
- 作者机构：
  
  电力设备电气绝缘国家重点实验室(西安交通大学),陕西省,西安市,710049
- 作者简介：
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- Published：2017
- 稿件说明：
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SHI Shuhuai. [J]. Automation of electric power systems, 2017, 41(13): 150-155.
DOI：

SHI Shuhuai. [J]. Automation of electric power systems, 2017, 41(13): 150-155. DOI：

摘要

模块化多电平换流器(MMC)是柔性直流输电技术的核心器件，MMC的子模块电容均压问题，是输电系统稳定运行的关键问题之一。针对这一问题，首先分析比较了现有的几种以电容电压排序为基础的电容均压算法。结合几种算法的优缺点，提出了一种优化的增量式电容均压算法，只引入一个电压上下限的参数，也能够实现电压波动、开关频率的可调节。最后，在PSCAD/EMTDC中建立了MMC的仿真模型，实现了四种均压算法并进行比较，验证了理论分析。仿真结果表明，所提出的电容均压算法能极大降低开关频率，在相同的电压波动情况下，开关频率更低，是一种性能更优良的均压算法。

Abstract

The modular multilevel converter(MMC)is the core component of flexible high voltage direct current(HVDC)transmission technology

the capacitor voltage balancing of MMC determines the stable operation of transmission systems. To solve this problem

several kinds of capacitor voltage balancing algorithms based on capacitor voltage sorting are analyzed. Considering the features of capacitor voltage balancing algorithms

an improved algorithm based on the incremental capacitor voltage balancing algorithm is proposed. With only one parameter—the voltage limit introduced

this algorithm can regulate both voltage fluctuation and switching frequency. A simulation model of MMC is developed in PSACAD/EMTDC

in which all four algorithms are realized

and the theoretical analysis is proved. The results show that the proposed algorithm can greatly reduce the switching frequency. When in the same situation of voltage fluctuation

a lower switching frequency implies it is a voltage balancing algorithm of better performance.

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