Circulating Current Inhibition of Parallel Converters with Carrier Phase-shifting in Microgrid

XIA Yan; ZOU Jianxiao; LI Kai; XU Chunke; SHI Fangzhou

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Circulating Current Inhibition of Parallel Converters with Carrier Phase-shifting in Microgrid

更新时间：2025-12-08

- Circulating Current Inhibition of Parallel Converters with Carrier Phase-shifting in Microgrid
- Vol. 45, Issue 3, Pages: 855-862(2019)
- 作者机构：
  
  1. 电子科技大学自动化工程学院
  2. 东方电气集团电力电子事业部
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：14 March 2019，
  
  Published：2019
- 稿件说明：
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XIA Yan, ZOU Jianxiao, LI Kai, et al. Circulating Current Inhibition of Parallel Converters with Carrier Phase-shifting in Microgrid[J]. 2019, 45(3): 855-862.
DOI：

XIA Yan, ZOU Jianxiao, LI Kai, et al. Circulating Current Inhibition of Parallel Converters with Carrier Phase-shifting in Microgrid[J]. 2019, 45(3): 855-862. DOI：

摘要

PWM变流器载波移相并联可以增大系统容量

减小入网电流谐波

但存在环流问题。首先分析了三相PWM变流器环流的等效数学模型

讨论了零序环流（ZSCC）产生原因。对零序电压注入式SVPWM调制算法所产生的环流进行傅里叶分析

针对零序环流的直流分量和3、9、15次谐波分量

提出一种基于准比例谐振（QPR）和比例积分（PI）结合的零序环流抑制方法

对4个模块并联的变流器环流抑制方法仿真。搭建了实际微网系统并进行了并网和离网实验。仿真和实验结果表明该策略可以有效地减小入网电流谐波和环流。

Abstract

Parallel PWM converters with carrier phase shifting can increase system capacity

reduce current harmonics into the grid

whereas lead to the problem of circulating current. Consequently

we established and analyzed the equivalent and average mathematic models of the zero-sequence circulating current（ZSCC）. Based on space vector pulse width modulation（SVPWM） of zero sequence injecting to sinusoidal pulse width modulation（SPWM）

the frequency characteristics and mathematic expression of ZSCC were researched. Aiming to reduce the dc and 3

9 and 15 harmonic components of ZSCC

we proposed a suppression method for the ZSCC based on QPR and PI

and simulated ZSCC for a converter which consists of 4 parallel modules. A microgrid platform was built to perform experiments of grid-connected mode and island mode. Results indicate that the control strategy is effective in reducing harmonic current and ZSCC.

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