摘要
为解决目前传统被动式孤岛检测方法精度低、检测盲区较大的问题,通过分析孤岛前后公共耦合点频率变化规律,提出了一种基于频率变化率的新型孤岛检测方法。锁频环控制通过无功功率负反馈实现对电网频率的跟踪,采用局部加权线性拟合算法对频率变化曲线进行拟合,求取频率拟合曲线斜率后,利用斜率曲线的波动变化来检测出孤岛的发生。Matlab/Simulink仿真结果表明,该方法能够在各种情况下准确地检测孤岛效应,消除检测盲区,且适用性强。
In order to solve the problems of low accuracy and big detection blind area in the traditional passive islanding detection method,the paper proposes a new islanding detection method based on the rate of change of frequency by analyzing the frequency change law of a common coupling point before and after the islanding.The tracking of grid frequency is realized with frequency-locked loop control through the negative feedback of reactive power,and the frequency change curve is fitted with a local weighted linear fitting algorithm.After calculating the slope of the frequency fitting curve,the fluctuation change of the slope curve is used to detect the occurrence of the islanding.The MATLAB/Simulink simulation results show that the proposed method can accurately detect the islanding effect in various situations,eliminate the detection blind zone,and has strong applicability.
作者
李文龙
张新慧
王蕾
解术誉
郭爱玉
王锐
LI Wenlong;ZHANG Xinhui;WANG Lei;XIE Shuyu;GUO Aiyu;WANG Rui(Smart Grid Research Institute,College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)
出处
《智慧电力》
北大核心
2024年第3期47-54,共8页
Smart Power
基金
国家自然科学基金资助项目(52377109)。
关键词
孤岛检测
分布式电源
线性拟合
锁频环
频率变化率
island detection
DG
linear fitting
frequency-locked loop
rate of change of frequency
作者简介
李文龙(1998),男,吉林延边人,硕士研究生,研究方向分布式电源发电及并网技术。
