混合不对称控制下多机分布式光伏并网稳定性提升方法

doi:10.3969/j.issn.1008-0198.2025.02.006

湖南电力 ›› 2025, Vol. 45 ›› Issue (2): 45-53.doi: 10.3969/j.issn.1008-0198.2025.02.006

• 源网协调与能源转换利用 • 上一篇下一篇

混合不对称控制下多机分布式光伏并网稳定性提升方法

王小源¹, 宁志毫¹, 高家元², 卿梦琪¹, 夏天¹, 唐星祝³, 易志坚³

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

收稿日期:2024-11-11 修回日期:2024-12-12 发布日期:2025-04-30
通信作者: 高家元(1991),男,讲师,主要从事新能源发电系统运行与控制方面的工作。
基金资助:
国网湖南省电力有限公司科技项目(5216A321N302)

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

WANG Xiaoyuan¹, NING Zhihao¹, GAO Jiayuan², QING Mengqi¹, XIA Tian¹, TANG Xingzhu³, YI Zhijian³

1. State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410208, China;
2. School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China;
3. Hunan Xiangdian Test and Research Institute Co., Ltd., Changsha 410208, China

Received:2024-11-11 Revised:2024-12-12 Published:2025-04-30

摘要/Abstract

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。

关键词: 光伏并网逆变器, 多机并网, 阻抗矩阵, dq轴阻抗重塑, 稳定性

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.

Key words: photovoltaic grid-connected inverter, multi-machine grid-connected, impedance matrix, dq axis impedance remodeling, stability

中图分类号:

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, QING Mengqi, XIA Tian, TANG Xingzhu, YI Zhijian. Stability Improvement Method of Multi-Machine Distributed PGCI Under Hybrid Asymmetric Control[J]. Hunan Electric Power, 2025, 45(2): 45-53.

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混合不对称控制下多机分布式光伏并网稳定性提升方法

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

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