Suppression Strategy of Grid-side Current Harmonics for Electrolytic Capacitor-less Permanent Magnet Motor Drives Under Unbalanced Grid Voltage

Dawei DING; Hui XIE; Gaolin WANG; Binxing LI; Dianguo XU

doi:10.13334/j.0258-8013.pcsee.241014

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Suppression Strategy of Grid-side Current Harmonics for Electrolytic Capacitor-less Permanent Magnet Motor Drives Under Unbalanced Grid Voltage

Motors and Their Systems | 更新时间：2026-02-05

- Suppression Strategy of Grid-side Current Harmonics for Electrolytic Capacitor-less Permanent Magnet Motor Drives Under Unbalanced Grid Voltage
- Proceedings of the CSEE Vol. 45, Issue 11, Pages: 4458-4468(2025)
- 作者机构：
  
  哈尔滨工业大学电气工程及自动化学院, 黑龙江省哈尔滨市 150001
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(52207042);Delta Power Electronics Science and Education Development Program(DREG2023005);Young Elite Scientists Sponsorship Program by CAST(2023QNRC001)
- DOI：10.13334/j.0258-8013.pcsee.241014
  CLC： TM351
- Received：06 May 2024，
  
  Published Online：04 November 2024，
  
  Published：05 June 2025
- 稿件说明：
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Dawei DING, Hui XIE, Gaolin WANG, et al. Suppression Strategy of Grid-side Current Harmonics for Electrolytic Capacitor-less Permanent Magnet Motor Drives Under Unbalanced Grid Voltage[J]. Proceedings of the CSEE, 2025, 45(11): 4458-4468.
DOI：

Dawei DING, Hui XIE, Gaolin WANG, et al. Suppression Strategy of Grid-side Current Harmonics for Electrolytic Capacitor-less Permanent Magnet Motor Drives Under Unbalanced Grid Voltage[J]. Proceedings of the CSEE, 2025, 45(11): 4458-4468. DOI： 10.13334/j.0258-8013.pcsee.241014.

摘要

在不平衡电网条件下，无电解电容驱动系统存在严峻的网侧电流谐波问题。提出一种基于整流电压全前馈的网侧电流谐波抑制方法，通过分析整流桥导通角度的变化，阐明系统输入电压与电感电流谐波含量变化机理；建立电感电流环路小信号模型，揭示整流电压与电感电流间的耦合关系；据此构建包含不平衡电网条件下功率流变化的整流电压全前馈函数，重塑系统网侧输出阻抗，实现整流电压扰动项在电感电流控制环路的解耦；构建驱动系统等效诺顿电路，依据级联系统判据验证施加控制策略后系统稳定性，解决常规电感电流控制在不平衡电网条件下的谐波抑制难题；最后，在无电解电容电机驱动平台上验证所提控制策略的有效性。

Abstract

The grid-side current distortion is severe in the electrolytic capacitor-less motor drive under the unbalanced grid condition. This paper proposes a grid current harmonics suppression strategy based on the rectified voltage full-feedforward. Through analyzing the variation of the rectifier bridge conduction angle

the mechanism of the change in harmonics of the input voltage and inductor current is clarified. The interaction between the rectified voltage and inductor current is revealed by establishing the small-signal model of the inductor current. The rectified voltage full-feedforward function incorporating power flow variations under the unbalanced grid condition is constructed which reshapes the equivalent output impedance of the drive on the grid side. Then the rectified voltage disturbance terms in the control loop of the inductor current are decoupled. By constructing the equivalent Norton circuit of the drive and applying the stability criterion of the cascade system

the stability of the drive after applying the control strategy is verified. The proposed control strategy has solved the tough problem of the regular inductor current control strategy in suppressing grid current harmonics under unbalanced grid condition. Finally

the effectiveness of the proposed control strategy is validated through experiments conducted on the electrolytic capacitor-less motor drive.

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references

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