电网技术2026，Vol.50Issue(6)：2541-2550,中插73-中插77,15.DOI:10.13335/j.1000-3673.pst.2024.2130
跟网构网混合系统的鲁棒稳定性分析与优化配置
Robust Stability Analysis and Optimization Configuration Research for Hybrid Systems of Grid-following and Grid-forming Converters
摘要
Abstract
The grid-following(GFL)converters are weakly supportive of the grid.As the proportion of synchronous machines decreases,it is necessary to configure a certain number of grid-forming(GFM)converters with the ability to actively support the grid,which will form the GFL-GFM hybrid system.The stability mechanism of this system is closely related to the grid strength characterized by the short circuit ratio(SCR).Considering that the dynamic external characteristics of renewable energy devices are difficult to model in detail,and SCR-based analysis methods have not yet been able to provide robust stability bounds.Therefore,this paper investigates the quantitative assessment method of robust stability for hybrid systems and provides a new theoretical framework for the optimal configuration of converters.Firstly,we construct a multiplicative perturbation model of the hybrid system to quantify the uncertainties in the system and deconstruct the model into two subsystems with equivalent robust stability in the low/sub-synchronous frequency bands,thus reducing the complexity of the analytical model.Secondly,we analyze the intrinsic relationship between robust stability and grid strength in multi-frequency bands,combine the modal decoupling theory and the small gain theorem to establish a sufficient criterion for robust stability,and then quantify the critical value of grid strength by determining the worst boundary conditions.Then,an optimal configuration model is proposed to minimize the number of modifications and the constraint of robust stability.Finally,simulation examples verified the effectiveness of the dynamic segmentation method and optimization configuration scheme for hybrid systems.关键词
混合组网系统/电网强度/鲁棒稳定性/小增益定理/优化配置Key words
GFL-GFM hybrid system/grid strength/robust stability/small gain theorem/optimization configuration分类
信息技术与安全科学引用本文复制引用
黄龙星源,庄可好,辛焕海,马骏超,汤波..跟网构网混合系统的鲁棒稳定性分析与优化配置[J].电网技术,2026,50(6):2541-2550,中插73-中插77,15.基金项目
国家电网有限公司总部科技项目(5108-202218280A-2-435-XG).Project Supported by the Science and Technology Project of State Grid Corporation of China(5108-202218280A-2-435-XG). （5108-202218280A-2-435-XG）
