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

作　　者：陆艺源 李宇骏 杨冬梅 牟同鹏 刘菁锐 刘梦奇 惠嘉祺 杜正春[1] LU Yiyuan;LI Yujun;YANG Dongmei;MU Tongpeng;LIU Jingrui;LIU Mengqi;HUI Jiaqi;DU Zhengchun(School of Electrical Engineering,Xi′an Jiaotong University,Xi′an 710049,China;NARI Technology Development Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]国电南瑞科技股份有限公司,江苏省南京市211106

出　　处：《电力系统自动化》2025年第7期25-34,共10页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2022YFB2402701)。

摘　　要：为保护耐压耐流能力有限的电力电子器件,虚拟同步发电机(VSG)通常配置多种控制器限幅。在暂态过程中,这些限幅将不可避免地被触发。针对含电流和频率限幅的多台VSG嵌入式电力系统,分析了暂态同步稳定性并提出一种保证系统稳定的控制方法。首先,建立了含电流限幅的多VSG系统的动态模型,构造了暂态能量函数,并利用最近不稳定平衡点法得到了保证未触发限幅系统稳定的最大能量V (x)。然后,分析了频率限幅的影响,发现频率限幅上能量最低的仅具有动能的两个点就是离开边界点,并提出了触发频率限幅后重置系统运行点至这两个特殊离开边界点的控制方法。最后,通过优化方法,找到了令多VSG系统不进入电流限幅的最大能量Vcs,并基于V (x)和Vcs中的最小值配置了特殊离开边界点的频率限幅值,保证了含电流和频率限幅的多VSG系统的全局稳定性。通过9节点电力系统的仿真分析和硬件在环实验证明了所提理论的正确性。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 

分 类 号：TM712[电气工程—电力系统及自动化]