Low-frequency Control Scheme of Modular Multilevel Converter

YU Yang; GE Qiongxuan; LEI Ming; WANG Xiaoxin; LI Yaohua

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Low-frequency Control Scheme of Modular Multilevel Converter

更新时间：2025-12-08

- Low-frequency Control Scheme of Modular Multilevel Converter
- Vol. 43, Issue 4, Pages: 1160-1167(2017)
- 作者机构：
  
  1. 北京电力经济技术研究院
  2. 中国科学院电工研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 April 2017，
  
  Published：2017
- 稿件说明：
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YU Yang, GE Qiongxuan, LEI Ming, et al. Low-frequency Control Scheme of Modular Multilevel Converter[J]. 2017, 43(4): 1160-1167.
DOI：

YU Yang, GE Qiongxuan, LEI Ming, et al. Low-frequency Control Scheme of Modular Multilevel Converter[J]. 2017, 43(4): 1160-1167. DOI：

摘要

为了研究模块化多电平(MMC)低频电容电压波动的问题

提出了一种MMC低频运行控制策略。首先

建立了MMC的数学模型

从能量流动的角度研究了MMC的电容电压波动情况

指出桥臂能量偏差与系统的运行频率呈反比

致使系统在低频下无法正常运行。针对这一问题

提出了一种在桥臂环流和输出电压中加入高频方波分量的方法来抑制电容电压的波动

确保MMC桥臂能量的平衡。理论分析结果表明

相比于加入高频正弦分量的方法

采用该方法得到的桥臂环流的峰值降低了50%。最后采用上述方法进行了阻感和电机实验

结果表明

模块电压波动得到了有效抑制

电机低频调速性能良好

证明了所提出的控制方法的有效性。

Abstract

To investigate the low-frequency capacitor-voltage fluctuation of modular multilevel converter（MMC）

we established a low-frequency operation-control strategy of MMC. Firstly

we established the mathematical model of MMC

and researched the capacitor-voltage fluctuation of MMC from the point of energy flow. It is pointed out that the deviation of the bridge arm energy is inversely proportional to operating frequency

causing that the system cannot run normally under low frequency. To solve this problem

we put forward a control scheme

which adds high frequency square-wave component to the arms’ circulating current and the output voltage simultaneously to suppress capacitor-voltage fluctuation and ensure the bridge arm energy balance of MMC. The theoretical analysis shows that when using the square-wave method

the peak circulating current will decrease by 50% than that by using the sinusoidal-wave method proposed in the previous work. The experimental results demonstrate that the fluctuation of modular capacitor voltage is restrained effectively and the low frequency drive system has good performance

demonstrating the effectiveness of the control scheme.

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直流输电技术全国重点实验室(南方电网科学研究院有限责任公司)

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