南方电网技术2026，Vol.20Issue(3)：19-31,13.DOI:10.13648/j.cnki.issn1674-0629.2026.03.003
弱电网下多逆变器并网稳定性分析及提高策略
Stability Analysis and Improved Strategy of Multi-Inverter Grid-Connected in Weak Grid
摘要
Abstract
In weak grid environments,the larger grid impedance enhances the coupling between the grid and each inverter in a multi-inverter parallel system,resulting in decreased system stability or even instability.To address this,a strategy for improving the stabil-ity of multi-inverter grid-connected systems under weak grid conditions is proposed.Firstly,Norton equivalent models for single and multiple grid-connected inverters in weak grids are established.Secondly,from the perspective of grid-connected current stability,the stability criterion for the multi-inverter system is decoupled into that of a single-inverter system based on the concept of equivalent grid impedance,clarifying the mechanism behind the reduced system stability in weak grids.Subsequently,an improved control strategy to enhance the stability of the multi-inverter system is proposed,which increases the stability margin of grid-connected invert-ers by introducing an all-pass filter into the grid voltage feedforward loop and combines a harmonic controller to improve the system's ability to suppress background harmonics.Finally,simulation analysis verifies that the proposed strategy effectively enhances the stability of multi-inverter grid-connected systems under weak grid conditions.关键词
弱电网/并网逆变器/稳定性/电网电压前馈/背景谐波Key words
weak grid/grid-connected inverter/stability/grid voltage feedforward/background harmonics分类
信息技术与安全科学引用本文复制引用
张世聪,徐永海,陶顺,张智..弱电网下多逆变器并网稳定性分析及提高策略[J].南方电网技术,2026,20(3):19-31,13.基金项目
国家自然科学基金资助项目(52377101). Supported by the National Natural Science Foundation of China(52377101). （52377101）
