Sequence-Based Vector Control of Hybrid VSC-CSC HVDC System for DC Power Second Harmonic Suppression

Yao Xiong; Xiaoguang Wei; Guangfu Tang; Song Li; Wenwen Zhang; Hui Du; Taosha Jiang; Yunhai Shan

doi:10.17775/CSEEJPES.2025.05990

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Sequence-Based Vector Control of Hybrid VSC-CSC HVDC System for DC Power Second Harmonic Suppression

Special Issue Commemorating the 10<sup>th</sup> Anniversary of CSEE Journal of Power and Energy Systems | 更新时间：2026-10-16

- Sequence-Based Vector Control of Hybrid VSC-CSC HVDC System for DC Power Second Harmonic Suppression
- CSEE Journal of Power and Energy Systems Vol. 11, Issue 6, Pages: 2912-2927(2025)
- 作者机构：
  
  1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University,Beijing,China
  2. Beijing Huairou Laboratory,Beijing,China
  3. China Southern Power Grid Novel Electric Power System (Beijing) Research Institute Co., Ltd.,Beijing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2025.05990
  CLC：
- Published：01 November 2025
- 稿件说明：
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Yao Xiong, Xiaoguang Wei, Guangfu Tang, et al. Sequence-Based Vector Control of Hybrid VSC-CSC HVDC System for DC Power Second Harmonic Suppression[J]. CSEE Journal of Power and Energy Systems, 2025, 11(6): 2912-2927.
DOI：

Yao Xiong, Xiaoguang Wei, Guangfu Tang, et al. Sequence-Based Vector Control of Hybrid VSC-CSC HVDC System for DC Power Second Harmonic Suppression[J]. CSEE Journal of Power and Energy Systems, 2025, 11(6): 2912-2927. DOI： 10.17775/CSEEJPES.2025.05990.

摘要

Abstract

This paper proposes a dual vector control scheme based on the sequence component separation strategy (SCSS) for second harmonic suppression in DC power. Firstly

an analytical model is established to depict the positive and negative sequences of the controllable current source converter (CSC) under unbalanced grid conditions. Moreover

the generation mechanism of the DC power second harmonic component in the hybrid VSC-CSC HVDC system is demonstrated. This paper summarizes the impact of the modulation index (MI) and power factor (PF) on the operating characteristics of the modular multilevel converter (MMC) during the variation of the DC voltage. Based on the above analysis

the proposed control scheme extracts the sequence components of the CSC capacitor voltage and directly computes the sequence voltage reference value using instantaneous power. This approach effectively suppresses the second-harmonic component in DC power and significantly reduces the range of capacitor-voltage fluctuations in MMC submodules. Finally

an electromagnetic transient model of the hybrid HVDC system is constructed to validate the accuracy of the theoretical analysis and the effectiveness of the proposed control scheme.

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references

8. X. G. Wei, Y. H. Shan, and X. L. Ta ng. ( 2025, Apr. ). Development status and trend of high-voltage direct current transmission technology. Proceedings of the CSEE . [Online ] . pp. 1–23. Available: https://doi.org/10.13334/j.0258--8013.pcsee.242661

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