Stability Improvement Method of Multi-Machine Distributed PGCI Under Hybrid Asymmetric Control

WANG Xiaoyuan; NING Zhihao; GAO Jiayuan; QING Mengqi; XIA Tian; TANG Xingzhu; YI Zhijian

doi:10.3969/j.issn.1008-0198.2025.02.006

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Stability Improvement Method of Multi-Machine Distributed PGCI Under Hybrid Asymmetric Control

更新时间：2025-11-30

- Stability Improvement Method of Multi-Machine Distributed PGCI Under Hybrid Asymmetric Control
- Vol. 45, Issue 2, Pages: 45-53(2025)
- 作者机构：
  
  1. 国网湖南省电力有限公司电力科学研究院,湖南,长沙,410208
  2. 长沙理工大学电气与信息工程学院,湖南,长沙,410114
  3. 湖南省湘电试验研究院有限公司,湖南,长沙,410208
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.1008-0198.2025.02.006
  CLC： TM712TM615.2
- Published Online：30 April 2025，
  
  Published：2025
- 稿件说明：
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王小源, 宁志毫, 高家元, 卿梦琪, 夏天, 唐星祝, 易志坚. 混合不对称控制下多机分布式光伏并网稳定性提升方法[J]. 湖南电力, 2025, 45(2): 45-53.

WANG Xiaoyuan, NING Zhihao, GAO Jiayuan, et al. Stability Improvement Method of Multi-Machine Distributed PGCI Under Hybrid Asymmetric Control[J]. 2025, 45(2): 45-53.
王小源, 宁志毫, 高家元, 卿梦琪, 夏天, 唐星祝, 易志坚. 混合不对称控制下多机分布式光伏并网稳定性提升方法[J]. 湖南电力, 2025, 45(2): 45-53. DOI： 10.3969/j.issn.1008-0198.2025.02.006.

WANG Xiaoyuan, NING Zhihao, GAO Jiayuan, et al. Stability Improvement Method of Multi-Machine Distributed PGCI Under Hybrid Asymmetric Control[J]. 2025, 45(2): 45-53. DOI： 10.3969/j.issn.1008-0198.2025.02.006.

摘要

针对多机分布式光伏并网逆变器与电网阻抗交互影响下的稳定性提升难题

分别从光伏并网逆变器d、q轴控制环出发

提出一种具有混合不对称控制架构的多机分布式光伏并网逆变器稳定性提升方法。首先

构建考虑直流侧电压波动的光伏并网逆变器单机系统小信号阻抗模型

在此基础上

考虑线路连接阻抗与电网阻抗影响

推导得到多机分布式光伏互联系统多输入多输出阻抗矩阵模型。其次

从并网逆变器的d、q轴阻抗特性出发

提出两类不对称阻抗重塑控制方法

提升单机并网系统的稳定性。同时

解析d、q轴混合不对称控制对多机并网系统的影响

表明d、q轴混合不对称控制可以有效改善并网系统对电网阻抗的适应性。最后

仿真验证所提控制策略的正确性与有效性。

Abstract

Aiming at the problem of stability improvement under the interaction between multi-machine distributed photovoltaic grid-connected inverter (PGCI) and grid impedance

a stability improvement method of multi-machine distributed PGCI with hybrid asymmetric control architecture is proposed from the d and q axis control loops of PGCI. Firstly

the small-signal impedance model of single-machine system of PGCI considering DC-side voltage fluctuation is constructed. On this basis

considering the influence of line connection impedance and grid impedance

the multi-input and multi-output impedance matrix model of multi-machine distributed PGCI is derived. Secondly

based on the d and q axis impedance characteristics of the GCI

two types of asymmetric impedance reshaping control methods are proposed

which significantly improve the stability of the single-machine grid-connected system. Meanwhile

by analyzing the influence of d-q axis hybrid asymmetric control on multi-machine PGCI

it is shown that d-q axis hybrid asymmetric control can effectively improve the adaptability of PGCI to grid impedance. Finally

the correctness and effectiveness of the proposed control strategy are verified by simulation.

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