电力系统自动化2024，Vol.48Issue(2)：140-150,11.DOI:10.7500/AEPS20230518011
基于等效同步功率的孤岛并联构网变流器系统暂态稳定性分析
Transient Stability Analysis of Islanded System with Parallel Grid-forming Converters Based on Equivalent Synchronous Power
摘要
Abstract
With the increasing application of grid-forming(GFM)converters in the microgrid,the effects of GFM converters on the transient stability of the microgrid have received extensive attentions.Different from the single-machine infinite bus system,the frequency and power angle of the islanded system with parallel GFM converters are coupled with each other,and the transient response characteristics are more complex.In order to accurately analyze the transient response of the islanded system with parallel GFM converters,this paper establishes a three-order transient synchronization model of frequency and power angle difference of two GFM converters based on the power angle coupling equation of motion,and analyzes the characteristics of the influence of the power output difference and droop coefficients of two GFM converters on the transient stability.In order to reveal the coupling mechanism of power output and droop coefficient on transient stability,the equivalent synchronous power of parallel GFM converters is analyzed.An adaptive droop coefficient optimization strategy is also proposed based on the power output of GFM converters,which can adaptively increase the equivalent synchronous power of the parallel system and thus improve the transient stability of the system.Finally,the real-time simulation is used to verify the correctness of the three-order transient model and the effectiveness of the proposed control strategy.关键词
构网变流器/孤岛微电网/暂态稳定性/相平面分析/等效同步功率/自适应下垂系数Key words
grid-forming converter/islanded microgrid/transient stability/phase-plane analysis/equivalent synchronous power/adaptive droop coefficient引用本文复制引用
邹赵悦,吴超,王勇,田杰,詹长江..基于等效同步功率的孤岛并联构网变流器系统暂态稳定性分析[J].电力系统自动化,2024,48(2):140-150,11.基金项目
国家自然科学基金资助项目(52207063). This work is supported by National Natural Science Foundation of China(No.52207063). （52207063）
