弱电网下跟/构网并联逆变器自适应控制策略

ZHANG Tao; CHEN Nianheng; LI Da; WANG Lingyun; LIU Wenli; WANG Xin

doi:10.13336/j.1003-6520.hve.20251359

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弱电网下跟/构网并联逆变器自适应控制策略

更新时间：2026-10-20

- 弱电网下跟/构网并联逆变器自适应控制策略
- Vol. 52, Issue 8, Pages: 3594-3601(2026)
- 作者机构：
  
  1. 三峡大学电气与新能源学院,宜昌,443002
  2. 湖北省输电线路工程技术研究中心(三峡大学),宜昌,443002
- 作者简介：
- 基金信息：
- DOI：10.13336/j.1003-6520.hve.20251359
  CLC：
- Received：31 August 2026，
  
  Published：2026
- 稿件说明：
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ZHANG Tao, CHEN Nianheng, LI Da, et al. 弱电网下跟/构网并联逆变器自适应控制策略[J]. 2026, 52(8): 3594-3601.
DOI：

ZHANG Tao, CHEN Nianheng, LI Da, et al. 弱电网下跟/构网并联逆变器自适应控制策略[J]. 2026, 52(8): 3594-3601. DOI： 10.13336/j.1003-6520.hve.20251359.

摘要

弱电网下，跟网型逆变器(grid following inverter

GFL)易发生次/超同步振荡，而构网型逆变器(grid forming inverter

GFM)具有较好的弱电网适应性，与GFL并联运行能提升并网系统稳定性，但配置成本随容量提升。为了提升弱电网工况下跟/构网并联逆变系统稳定性，并降低构网型逆变器配置容量，提出了一种基于阻抗检测的并联逆变器自适应控制策略。首先，建立跟网型及构网型逆变器q轴阻抗数学模型，使用Nyquist稳定判据分析弱电网工况下GFL输出振荡与q轴阻抗的联系，并分析了不同短路比及不同GFM配置容量下的系统运行稳定性；之后提出自适应控制策略，在低GFM配置容量条件下，重塑GFM q轴阻抗，提升不同程度弱电网下并联系统稳定性，并使用MATLAB/Simulink对所提策略有效性进行验证。研究结果表明：该文提出的控制策略在低GFM配置容量下，有效提升了并联系统在不同程度弱电网中的运行稳定性。

Abstract

Under weak grid conditions

grid-following inverters (GFL) are prone to sub/super-synchronous oscillations

whereas grid-forming inverters (GFM) exhibit better adaptability to weak grids. The parallel operation of GFL and GFM can enhance the stability of grid-connected systems

but the configuration cost increases with installed GFM capacity. To improve the stability of parallel GFL/GFM inverter systems under weak grid conditions while reducing the required capacity of GFM

an adaptive control strategy based on impedance detection is proposed. Firstly

the q-axis impedance mathematical models for both GFL and GFM are established. The Nyquist stability criterion is used to analyze the relationship between GFL output oscillations and q-axis impedance under weak grid conditions. System stability at different short-circuit ratios and different GFM capacity configurations is also evaluated. Subsequently

an adaptive control strategy is proposed to reshape the GFM q-axis impedance when the installed GFM capacity is low

thereby enhancing the stability of the parallel system over a range of weak-grid strengths. The effectiveness of the proposed strategy is verified using MATLAB/Simulink. The research results demonstrate that the proposed control strategy can be adopted to effectively improve the operational stability of the parallel system under different weak grid conditions when the installed GFM capacity is low.

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