Circulating Current Characteristics and Stability Analysis of Motor-generator Pair Driven by Parallel Inverters

LI Chenyang; HUANG Yongzhang; FU Wenqi; YANG Xin; GU Yujun

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Circulating Current Characteristics and Stability Analysis of Motor-generator Pair Driven by Parallel Inverters

更新时间：2025-12-08

- Circulating Current Characteristics and Stability Analysis of Motor-generator Pair Driven by Parallel Inverters
- Vol. 48, Issue 2, Pages: 781-788(2022)
- 作者机构：
  
  华北电力大学新能源电力系统国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：28 February 2022，
  
  Published：2022
- 稿件说明：
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LI Chenyang, HUANG Yongzhang, FU Wenqi, et al. Circulating Current Characteristics and Stability Analysis of Motor-generator Pair Driven by Parallel Inverters[J]. 2022, 48(2): 781-788.
DOI：

LI Chenyang, HUANG Yongzhang, FU Wenqi, et al. Circulating Current Characteristics and Stability Analysis of Motor-generator Pair Driven by Parallel Inverters[J]. 2022, 48(2): 781-788. DOI：

摘要

为了分析并联驱动方式对新能源同步机(motor-generator pair

MGP)运行稳定性和环流特性的影响，基于多逆变器并联驱动MGP的矢量控制策略，首先根据该并联驱动系统的等效电路研究了环流产生的机理，对比和分析了MGP电流控制和逆变器环流控制在原理上的相似性，揭示了该控制方式下MGP电流调节系数可以等效地起到对逆变器环流的抑制作用。然后结合实验参数分析了MGP电流控制环和环流控制环的稳定性并进行了参数优化，进一步地分析了该参数下逆变器并联数量N对环流控制稳定性的影响，结果表明并联数量的增多会造成控制系统幅值裕度的降低和响应速度的变慢。最后在建立的双逆变器并联驱动5 kW MGP系统的实验平台上对电流控制的稳定性进行验证，所提控制策略可以较好地驱动MGP并网运行，系统响应速度快，逆变器之间的环流小。

Abstract

In order to analyze the influences of parallel driving mode on the operation stability and circulating current characteristics of motor-generator pair（MGP）

based on the vector control strategy of MGP driven by parallel inverters

firstly

the mechanism of circulating current was studied

and the similarity of current control of MGP and circulating current control of inverters in principle was compared and analyzed according to the equivalent circuit of the parallel drive system in this paper. The results reveal that the current regulation coefficient of MGP can effectively restrain the circulating current of the inverters. Then the stability of current loop and circulating current loop was analyzed and the parameters were optimized according to the experimental parameters

in addition

the influence of the number of parallel inverters N on the stability of the circulating current loop was analyzed under the parameters. The results show that the increase of the number will reduce the amplitude margin of the control system and slow down the speed of response. Finally

the stability of current control was verified on the experimental platform of 5 kW MGP system driven by double inverters in parallel operation. The proposed control strategy has a good performance on the grid connected operation of MGP

the response speed of the system is fast

and also the circulating current between the inverters is relatively small.

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