电力系统保护与控制2025，Vol.53Issue(9)：25-37,13.DOI:10.19783/j.cnki.pspc.240557
计及有功-频率环动态特性影响的储能VSG故障特性研究
Study on fault characteristics of energy storage VSG considering the dynamic characteristics of the active power-frequency loop
摘要
Abstract
The virtual synchronous generator(VSG)technology for energy storage is an important measure to ensure system frequency and voltage stability.During faults,power fluctuations cause nonlinear changes of the output angular frequency of the active power-frequency loop,significantly impacting the transient fault characteristics of energy storage VSG.Existing research on the fault characteristics of energy storage VSG mainly focuses on the discharging state and often neglects changes in angular frequency,making it difficult to ensure the accuracy of analytical calculations for electrical quantities such as voltage and current.To address this,this paper studies the transient characteristics of energy storage VSG in different operating states and during rapid switching of states.A new fault characteristic analysis method of energy storage VSG is proposed that takes into account the dynamic characteristics of the active power-frequency loop.Taking symmetrical short-circuit faults as the scenario,the mechanism of angular frequency variation after the fault is analyzed,and a simplified method based on the equal area principle is proposed to clarify the nonlinear characteristics of the grid voltage change under the influence of angular frequency changes.Furthermore,by analyzing how the transient characteristics of voltage affect the short-circuit current,the analytical expression of short-circuit current is established by comprehensively considering the dynamic response of the reactive power-voltage loop and the virtual impedance loop.Compared with traditional analytical methods that ignore the dynamic characteristics of the active power-frequency loop,the proposed method can accurately characterize the transient fault characteristics of electrical quantities such as voltage and current in energy storage VSG,while the conclusions can provide valuable references for protection strategy research in grid-forming scenarios.关键词
储能虚拟同步发电机/有功-频率环/充放电运行状态/故障特性/对称短路Key words
energy storage virtual synchronous generator/active power-frequency loop/charge/discharge operating state/fault characteristics/symmetrical short circuit引用本文复制引用
郑涛,马英,王珞秋,马通芳..计及有功-频率环动态特性影响的储能VSG故障特性研究[J].电力系统保护与控制,2025,53(9):25-37,13.基金项目
国家自然科学基金联合基金项目资助(U2166205) （U2166205）
国家电网有限公司科技项目资助(SGTYHT/21-JS-223)"电化学储能电站接入系统继电保护关键技术研究"This work is supported by the Joint Fund of National Natural Science Foundation of China(No.U2166205). （SGTYHT/21-JS-223）
