一种改进的低谐波畸变主动移频式孤岛检测算法  

An Improved Active Frequency Drift Islanding Detection Method with Low Harmonics Distortion

作　　者：刘浩[1] 吉培荣[1] 郑年伟 刘婧珂 LIU Hao;JI Peirong;ZHENG Nianwei;LIU Jingke(Hubei Micro-grid Engineering Technology Research Center(China Three Gorges University),Yichang 443002,China)

机构地区：[1]湖北省微电网工程技术研究中心(三峡大学),湖北宜昌443002

出　　处：《电工材料》2020年第3期46-49,54,共5页Electrical Engineering Materials

摘　　要：在分布式并网发电系统中,孤岛检测是系统并网的必要功能,常采用主动移频式方法(AFD)检测孤岛效应。AFD可快速检测出孤岛,但此方法存在电流谐波畸变量(THD)和检测盲区两个较大的问题,为此本文提出一种改进的AFD用于孤岛检测,在正弦波基波的第2、4个1/4周期区域引入阶跃波形,在不影响原有AFD算法检测性能的基础上,缩小检测盲区、降低THD,提高电能质量。采用Matlab/Simulink对单相光伏发电系统进行仿真验证,仿真结果证明改进方法的有效性和可行性。In distributed grid-connected power generation system,island detection is the necessary function of grid system,active frequency shift method(AFD)is often used to detect islanding,this method can quickly detect the island,but increase the amount of current harmonic distortion THD,this paper proposed an improved AFD islanding detection method that insert step waveform into the second and fourth quarter period region of fundamental sine wave to reducing none detection zone,reducing THD and improve power quality on the basis of without affecting the performance of the original AFD algorithm.Matlab/Simulink was used to establish a simulation model to simulate and verify the single photovoltaic power generation system,proving the effectiveness and feasibility of the improved method.

关 键 词：光伏发电 主动移频法 孤岛效应 THD 

分 类 号：TM615.2[电气工程—电力系统及自动化]