电力系统自动化2025，Vol.49Issue(7)：25-34,10.DOI:10.7500/AEPS20240330001
考虑控制器限幅的多虚拟同步发电机系统暂态同步稳定性分析
Transient Synchronization Stability Analysis of Multi-virtual-synchronous-generator System Considering Controller Limiting
摘要
Abstract
To protect power electronics with limited withstand voltage and current capability,virtual synchronous generators(VSGs)are typically configured with multiple controller limits,which are inevitably triggered during the transient process.This paper analyzes the transient synchronization stability of embedded power systems with multi-VSG incorporating current and frequency limiting,and proposes a control method to ensure the system stability.First,the dynamic model of a multi-VSG system with current limiting is established,and the transient energy function(TEF)is constructed.Using the nearest unstable equilibrium point(UEP)method,the maximum energy required to maintain stability in an untriggered limiting system is determined.Then,the influence of frequency limiting is analyzed.It is found that the two points with the lowest energy on the frequency limiting curve,which have only kinetic energy,are the leaving boundary points.And a control method is proposed to reset the system operation point to these two special leaving boundary points after triggering the frequency limiting.Finally,the maximum energy that prevents the multi-VSG system from entering the current limiting mode is determined by using an optimization method.The frequency limiting value at these special leaving boundary points is configured based on the minimum value,ensuring the global stability of the multi-VSG system with both current and frequency limiting.The correctness of the proposed theory is proven by simulation analysis and hardware test of the 9-bus power system.关键词
虚拟同步发电机/电流限幅/频率限幅/暂态同步稳定性/暂态能量函数/离开边界点Key words
virtual synchronous generator/current limiting/frequency limiting/transient synchronization stability/transient energy function/leaving boundary point引用本文复制引用
陆艺源,李宇骏,杨冬梅,牟同鹏,刘菁锐,刘梦奇,惠嘉祺,杜正春..考虑控制器限幅的多虚拟同步发电机系统暂态同步稳定性分析[J].电力系统自动化,2025,49(7):25-34,10.基金项目
国家重点研发计划资助项目(2022YFB2402701). This work is supported by National Key R&D Program of China(No.2022YFB2402701). （2022YFB2402701）
