一种新型低畸变主动孤岛检测算法的研究  

Research on a new low-distortion active algorithm for islanding detection

作　　者：乔家振 杨淑连[1] 李田泽[1] 南雪 QIAO Jiazhen;YANG Shulian;LI Tianze;NAN Xue(College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《现代电子技术》2018年第17期132-135,140,共5页Modern Electronics Technique

基　　金：山东省教育厅项目(J15LN31)~~

摘　　要：孤岛检测是并网光伏逆变器保护电气设备和相关维修人员安全所必备的功能,要求其检测算法不仅具有较快的检测速度,而且还要尽量减少对电能质量的不良影响。传统的主动频移式孤岛检测算法行之有效,但是由于电流扰动量的存在,对其输出的电能质量影响较大。针对上述问题,通过对其扰动原理进行研究,提出一种新型主动频移式孤岛检测方案,该方案通过移相的方式实现频移。仿真结果表明,频移式新算法检测盲区小,与传统频移法相比总谐波畸变率降低了24.8%,检测速度提前了0.1 s。该算法在有效减少谐波畸变率的同时提高了检测速度,显著提高了注入电网的电能质量。The islanding detection is a necessary function for photovoltaic grid-connected inverter to protect the electrical equipment and related maintenance personnel security,and its detection algorithm should have fast detection speed and active power quality effect.The traditional active frequency drift algorithm for islanding detection is effective,but its current disturbance quantity has a great influence on the output power quality.Aiming at the above problems,a new type of active frequency drift scheme for islanding detection is proposed by studying its disturbance principle,which can realize the frequency drift by means of phase drift.The simulation results show that the new frequency drift detection algorithm has small non-detection zone,its total harmonic distortion rate is reduced by 24.8%and the detection speed is 0.1 s improved than that of the traditional frequency drift method.The algorithm improves the detection speed while effectively reducing the harmonic distortion rate,and significantly improves the power quality of power grid.

关 键 词：并网光伏系统 主动移频 孤岛检测 扰动方式 谐波 分布式发电 

分 类 号：TN98-34[电子电信—信息与通信工程] TM615[电气工程—电力系统及自动化]