Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System

Chunyi Guo; Wei Zhao; Shuo Yang; Zhangxi Wu; Chengyong Zhao

doi:10.17775/CSEEJPES.2022.00630

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Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System

Regular Papers | 更新时间：2026-06-12

- Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System
- Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System
- 中国电机工程学会电力与能源系统学报(英文) 2026年12卷第3期页码：1491-1501
- 作者机构：
  
  State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University,Beijing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.00630
  中图分类号：
- 纸质出版：2026
- 稿件说明：
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Chunyi Guo, Wei Zhao, Shuo Yang, 等. Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System[J]. 中国电机工程学会电力与能源系统学报(英文), 2026,12(3):1491-1501.

Chunyi Guo, Wei Zhao, Shuo Yang, et al. Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System[J]. CSEE Journal of Power and Energy Systems, 2026, 12(3): 1491-1501.
Chunyi Guo, Wei Zhao, Shuo Yang, 等. Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System[J]. 中国电机工程学会电力与能源系统学报(英文), 2026,12(3):1491-1501. DOI： 10.17775/CSEEJPES.2022.00630.

Chunyi Guo, Wei Zhao, Shuo Yang, et al. Current Balancing Control Approach for Paralleled MMC Groups in Hybrid LCC/VSC Cascaded HVDC System[J]. CSEE Journal of Power and Energy Systems, 2026, 12(3): 1491-1501. DOI： 10.17775/CSEEJPES.2022.00630.

摘要

Abstract

A high voltage direct current (HVDC) system with conventional line commutated converter (LCC) and multiple paralleled modular multilevel converters (MMCs) in hybrid cascaded connection at the inverter side

known as a hybrid LCC/VSC cascaded HVDC (HC-HVDC) system

effectively integrates the advantages of LCC

as well as MMC technologies. However

due to the master-slave control mode adopted in the project of paralleled MMC stations

current imbalance issues would inevitably occur among paralleled MMCs in the case of power change

DC voltage drop and short-circuit fault conditions

which could result in overcurrent in MMCs or even slow down the fault recovery process. To realize current of MMC group distributed evenly

a power-based compensation control is proposed in this paper. First

imbalanced current between power-controlled and voltage-controlled MMCs is deduced

then the imbalanced current is transformed into active power

and finally

obtained active power is compensated to the active power outer loop control. By compensating the active power reference value

the proposed control approach can achieve current balancing of paralleled MMCs under different conditions. The HC-HVDC system

based on the Baihetan-Jiangsu project

which is currently under construction

is developed in PSCAD/EMTDC to validate effectiveness of the proposed control approach. Results show that

power-based compensation control can effectively balance currents of paralleled MMCs

accelerate system recovery process

and improve system dynamics.

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