Capacitor voltage ripple suppression mechanism and control strategy for hexverter

SHU Jun; YI Yang; CHEN Zhengfeng; LU Zhongpeng; HUANG Yiwei; LIU Darui; ZHANG Yiming

doi:10.11930/j.issn.1004-9649.202602001

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Capacitor voltage ripple suppression mechanism and control strategy for hexverter

更新时间：2026-08-04

- Capacitor voltage ripple suppression mechanism and control strategy for hexverter
- Vol. 59, Issue 5, Pages: 109-117(2026)
- 作者机构：
  
  1. 东方电气（成都）创新研究有限公司,四川,成都,611731
  2. 福建省新能源发电与电能变换重点实验室（福州大学）,福建,福州,350108
- 作者简介：
- 基金信息：
- DOI：10.11930/j.issn.1004-9649.202602001
  CLC：
- Online First：15 May 2026，
  
  Published：2026
- 稿件说明：
移动端阅览
舒军, 易杨, 陈正丰, 卢忠鹏, 黄艺炜, 刘达锐, 张艺明. 六边形变换器电容电压纹波抑制机理及控制策略[J]. 中国电力, 2026, 59(5): 109-117.

SHU Jun, YI Yang, CHEN Zhengfeng, et al. Capacitor voltage ripple suppression mechanism and control strategy for hexverter[J]. 2026, 59(5): 109-117.
舒军, 易杨, 陈正丰, 卢忠鹏, 黄艺炜, 刘达锐, 张艺明. 六边形变换器电容电压纹波抑制机理及控制策略[J]. 中国电力, 2026, 59(5): 109-117. DOI： 10.11930/j.issn.1004-9649.202602001.

SHU Jun, YI Yang, CHEN Zhengfeng, et al. Capacitor voltage ripple suppression mechanism and control strategy for hexverter[J]. 2026, 59(5): 109-117. DOI： 10.11930/j.issn.1004-9649.202602001.

摘要

在低频工况下，为抑制六边形变换器（Hexverter）子模块电容低频电压纹波，须提升直流电容容量，致使变换器体积与成本显著增加。为降低对直流电容的设计需求，提出一种电容电压纹波抑制机理及控制策略。基于Hexverter交流正序网络模型，分析子模块电容的充放电功率特性，建立了电容电压纹波的解析模型。通过Hexverter零序网络模型，推导零序交流环流与零序转移功率之间的定量关系，阐明基于特定次零序交流环流注入的电压纹波抑制机理。在此基础上，基于传统Hexverter控制策略，提出含电压纹波抑制控制环节的Hexverter复合控制策略，实现对子模块电容电压纹波抑制。仿真结果表明，所提控制策略能够显著降低电容电压纹波，验证了该电压纹波抑制机理的正确性与有效性。

Abstract

At low-frequency operating conditions

the submodule capacitor voltage ripple in Hexverter increases significantly

leading to higher capacitance requirements and resulting in increased converter volume and cost. To alleviate the design constraints on DC support capacitors

this paper proposes a capacitor voltage ripple suppression mechanism and control strategy. Based on the AC positive-sequence network model of the Hexverter

the charging and discharging power characteristics of the submodule capacitors are analyzed

and an analytical model of the capacitor voltage ripple is established. Furthermore

through the zero-sequence network model of the Hexverter

the quantitative relationship between the zero-sequence AC circulating current and the zero-sequence transferred power is derived

clarifying the voltage ripple suppression mechanism based on the injection of specific-order zero-sequence AC circulating currents. On this basis

combined with the conventional Hexverter control strategy

a compound control strategy for the Hexverter incorporating a ripple suppression loop is proposed to effectively suppress the submodule capacitor voltage ripple. Simulation results demonstrate that the proposed control strategy can significantly reduce the capacitor voltage ripple

verifying its feasibility and effectiveness.

关键词

Keywords

references

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