主动式移频法改进及其在孤岛检测中的应用  

Improvement for Method of Active Frequency Drift and Application in Islanding Detection

作　　者：刘启航 Liu Qihang(College of Electrical Engineering,North China University of Water Resources and Electric Power,Zhengzhou,China)

机构地区：[1]华北水利水电大学电气工程学院,河南郑州

出　　处：《科学技术创新》2024年第18期197-201,共5页Scientific and Technological Innovation

摘　　要：针对传统AFDPF法在孤岛检测中检测慢、谐波大以及盲区大的缺点,提出一种变频率正反馈系数的算法,并对该算法进行了相应的仿真研究。结果表明,新算法与传统AFDPF法相比,孤岛检测时间缩短了约三个电网周期,逆变器输出电流的总谐波失真度(THD)由0.96%下降至0.46%。In this paper,an active frequency drift with positive feedback with low harmonic and variable frequency positive feedback coefficient algorithm is proposed to solve the problem of large harmonics and large detection blind areas caused by constant chopper factor and the frequency positive feedback coefficient in islanding detection.In islanding detection model,the algorithm is simulated and studied.The results show that compared with the traditional active frequency drift with positive feedback,the proposed algorithm can shorten the islanding detection time by about three grid cycles,and reduce the total harmonic distortion of inverter output current from 0.96%to 0.46%.

关 键 词：孤岛检测 低谐波 主动频率偏移 变频率正反馈系数 

分 类 号：TM935[电气工程—电力电子与电力传动]