Circulating current suppression strategy for parallel microgrid inverters with common DC bus

LI Shanshou; XU Xing; FANG Qiansheng; HUANG Meichu; CHEN Tao

doi:10.19783/j.cnki.pspc.251232

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Circulating current suppression strategy for parallel microgrid inverters with common DC bus

更新时间：2026-06-18

- Circulating current suppression strategy for parallel microgrid inverters with common DC bus
- Power System Protection and Control Vol. 54, Issue 11, (2026)
- 作者机构：
  
  安徽省智能建筑与建筑节能重点实验室 (安徽建筑大学),安徽,合肥,230022
- 作者简介：
- 基金信息：
- DOI：10.19783/j.cnki.pspc.251232
  CLC：
- Published：2026
- 稿件说明：
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LI Shanshou, XU Xing, FANG Qiansheng, et al. Circulating current suppression strategy for parallel microgrid inverters with common DC bus[J]. Power System Protection and Control, 2026, 54(11).
DOI：

LI Shanshou, XU Xing, FANG Qiansheng, et al. Circulating current suppression strategy for parallel microgrid inverters with common DC bus[J]. Power System Protection and Control, 2026, 54(11). DOI： 10.19783/j.cnki.pspc.251232.

摘要

针对共直流母线多逆变器并联环流抑制问题，在分析三相四桥臂逆变器并联系统的环流回路及激励源特性基础上，研究了在虚拟同步发电机 (virtual synchronous generator

VSG) 中引入虚拟阻抗所导致的环流振荡及低频环流累积效应。在此基础上，提出了一种基于滑模控制 (sliding mode control

SMC) 的环流抑制策略。所提策略基于 Lyapunov 稳定性理论设计，即通过在控制环路中引入指数趋近律，生成等效反向激励源，从而实现瞬时环流的抑制。同时，利用滑模面导数的比例负反馈环节调整调制波幅值增益，以实现对低频环流的抑制。在载波频率分别为 15 kHz 和 20 kHz 且滤波器参数不匹配的典型工况下，仿真结果显示，零序环流峰值由 1.6 A 降至 0.9 A，低频环流的累积效应得到了有效抑制。实验平台测得环流峰值由 5 A 降至 2.5 A，进一步验证了所提策略在实际工程中的可行性与有效性。

Abstract

To address the issue of circulating current suppression in parallel common DC-bus multi-inverter systems

this paper analyzes the circulating current loop and excitation source characteristics of a three-phase four-leg inverter parallel system. Based on this analysis

the circulating current oscillation and low-frequency circulating current cumulation effects caused by introducing virtual impedance into the virtual synchronous generator (VSG) control strategy are investigated. On this basis

a circulating current suppression strategy based on sliding mode control (SMC) is proposed. The proposed strategy is designed according to Lyapunov stability theory. Specifically

an exponential reaching law is introduced into the control loop to generate an equivalent reverse excitation source

thereby suppressing instantaneous circulating currents. Meanwhile

a proportional negative-feedback term based on the derivative of the sliding surface is employed to adjust the modulation wave amplitude gain

thereby mitigating low-frequency circulating currents. Under typical operating conditions with carrier frequencies of 15 kHz and 20 kHz and mismatched filter parameters

simulation results show that the peak zero-sequence circulating current is reduced from 1.6 A to 0.9 A

effectively suppressing the cumulation effect of low-frequency circulating currents. Experimental tests on a hardware platform further demonstrate a reduction in the circulating current peak from 5 A to 2.5 A

thereby validating the feasibility and effectiveness of the proposed strategy in practical engineering applications.

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references

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