摘要
孤岛检测是光伏并网发电系统的必备功能,对孤岛效应的检测必须快速而准确,同时孤岛检测方法应尽量减小对并网电流质量的影响。基于正反馈主动频率偏移法是目前应用最广泛的一种检测孤岛的算法。为了解决该算法中的检测盲区大、影响并网电流质量等缺点,提出一种改进的正反馈主动频率偏移法。该方法通过检测初始时刻频率偏差的大小,确定初始斩波因子和扰动施加的方向,通过累加频率偏差的绝对值反馈作用到公共点上。改进的孤岛检测方法不仅提高了孤岛检测精度,也降低了电流谐波畸变率。由仿真结果可知,改进后的AFDPF算法孤岛检测时间比传统AFDPF算法快了0.04 s。
The active frequency drift with positive feedback(AFDPF)algorithm is a current widely-used isolate detectionalgorithm.In order to eliminate the shortcomings of big detection blind area and the influence on quality of grid connected cur-rent existing in the algorithm,an improved AFDPF algorithm is proposed.The method detects the frequency deviation at the ini-tial moment to determine the initial chopping factor and the disturbance infliction direction,and accumulates the absolute valueof the frequency deviation to feed back to the common point.The improved island detection algorithm can improve the island de-tection accuracy,and also reduce the current harmonic distortion rate.The simulation results show that the island detection timeof the improved AFDPF algorithm is0.04s faster than that of the traditional AFDPF algorithm.
作者
万荣庆
叶银忠
马向华
WAN Rongqing;YE Yinzhong;MA Xianghua(School of Electrical and Electronic Engineering,Shanghai Institute of Technology,Shanghai 201418,China)
出处
《现代电子技术》
北大核心
2017年第10期178-182,共5页
Modern Electronics Technique
基金
国家自然科学基金资助(61374132)
