电力系统保护与控制2024，Vol.52Issue(23)：45-53,9.DOI:10.19783/j.cnki.pspc.240337
基于VSG角频率误差负反馈的电压相位变化率孤岛检测方法
An islanding detection method based on voltage phase rate of change with VSG angular frequency error negative feedback
摘要
Abstract
To ensure safe operation of the power grid,distributed power sources connected to the grid need to have islanding detection capabilities.Traditional over/under frequency(OUF)and over/under voltage(OUV)methods for islanding detection have a significant non-detection zone(NDZ)when applied to islands formed by virtual synchronous generator(VSG)-controlled inverters and grid-following inverters.To address this issue,the expressions for voltage amplitude and frequency are first derived for the scenario where grid-forming and grid-following inverters jointly form an island.Based on this,it is verified that the OUF and OUV methods cannot accurately detect the islanding condition.Then,a method for islanding detection is proposed by calculating the rate of change of voltage phase in the dq frame.Additionally,angular frequency error negative feedback is introduced into the active power loop of the VSG to improve detection accuracy and sensitivity.Finally,an islanding model of grid-forming and grid-following inverters using PSCAD is built,and the simulation validates the effectiveness of the proposed method.关键词
孤岛检测/VSG/角频率误差负反馈/并联逆变器/跟网逆变器Key words
islanding detection/virtual synchronous generators(VSG)/angular frequency error negative feedback/parallel inverter/grid-following inverter引用本文复制引用
罗瑞,高厚磊,齐晓丽,陈鹤冲,杨帆,杨志淳..基于VSG角频率误差负反馈的电压相位变化率孤岛检测方法[J].电力系统保护与控制,2024,52(23):45-53,9.基金项目
This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China(No.5400-202322206A-1-1-ZN). 国家电网公司总部科技项目资助(5400-202322206A-1-1-ZN) （No.5400-202322206A-1-1-ZN）
