Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault

Zhen He; Maozeng Lu; Lijun Hang; Pingliang Zeng; Yanhua Liu

doi:10.17775/CSEEJPES.2022.03810

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Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault

Regular Papers | 更新时间：2026-10-15

- Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault
- Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault
- 中国电机工程学会电力与能源系统学报(英文) 2024年10卷第2期页码：778-785
- 作者机构：
  
  1. Hangzhou Dianzi University,Hangzhou,China
  2. Shandong University of Technology,Zibo,China
  3. State Grid Hangzhou Power Supply Company, State Grid,Hangzhou,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.03810
  中图分类号：
- 纸质出版：2024-03-01
- 稿件说明：
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Zhen He, Maozeng Lu, Lijun Hang, 等. Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault[J]. 中国电机工程学会电力与能源系统学报(英文), 2024,10(2):778-785.

Zhen He, Maozeng Lu, Lijun Hang, et al. Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault[J]. CSEE Journal of Power and Energy Systems, 2024, 10(2): 778-785.
Zhen He, Maozeng Lu, Lijun Hang, 等. Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault[J]. 中国电机工程学会电力与能源系统学报(英文), 2024,10(2):778-785. DOI： 10.17775/CSEEJPES.2022.03810.

Zhen He, Maozeng Lu, Lijun Hang, et al. Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault[J]. CSEE Journal of Power and Energy Systems, 2024, 10(2): 778-785. DOI： 10.17775/CSEEJPES.2022.03810.

摘要

Abstract

Modular multilevel converter (MMC) based fault ride through (FRT) control is a promising solution to deal with the pole-to-ground (PTG) fault in high voltage direct current (HVDC) system. However

when MMC switches to the FRT control

capacitor voltage imbalance between upper and lower arms will occur

resulting in the deterioration of FRT performance. This letter provides a comprehensive analysis for the imbalance issue from the perspective of fundamental frequency circulating current (FFCC). It is found the imbalance during FRT stage will not expand continuously

but converge to a certain value gradually. The specific imbalance degree is closely associated with the amplitude of FFCC. In order to solve the imbalance issue

an open-loop balancing control is proposed. By introducing a fundamental frequency feedforward item to the inherent circulating current control

the proposed method can not only balance the capacitor voltages

but also minimize the amplitude of FFCC

and consequently the power loss of MMC during FRT process can be reduced. Finally

simulation results of PSCAD/ EMTDC verify the validity of theoretical analysis.

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