一种改进的带正反馈的主动频移法仿真  

Simulation on an improved active frequency drift with positive feedback method

作　　者：薛士龙[1] 蒋晨[1] 耿攀[1] 李帆[1] 

机构地区：[1]上海海事大学物流工程学院,上海201306

出　　处：《上海海事大学学报》2015年第1期75-80,85,共7页Journal of Shanghai Maritime University

基　　金：国家自然科学基金(61374132);上海海事大学研究生创新基金(2013ycx007)

摘　　要：为提高光伏发电系统孤岛检测性能,在带正反馈的主动频移(Active Frequency Drift with Positive Feedback,AFDPF)法的基础上,将初始斩波因子设置为公共耦合点(Point of Common Coupling,PCC)电压频率的函数,设计一种变初始斩波因子的AFDPF法.基于Qf0×Cnorm坐标系分析比较两种AFDPF法的检测盲区,并在MATLAB/Simulink环境下,对单相光伏并网发电系统的孤岛检测进行仿真.结果表明:使用AFDPF法时,反馈系数的大小与孤岛检测速度成正比,与检测盲区成反比;改进的AFDPF法可以根据负载的性质改变初始扰动的方向,检测盲区的位置也会随之向上或向下移动;改进的AFDPF法不仅适用于容性负载和感性负载,而且可减小检测盲区和加快检测速度.To improve the islanding detection performance of photovoltaic system,the initial chopping fraction is set as a function of the voltage frequency of the Point of Common Coupling（ PCC）,and then the Active Frequency Drift with Positive Feedback（ AFDPF） method with a changeable initial chopping fraction is designed based on the AFDPF method. Non-Detection Zones（ NDZs） of the two methods are analyzed and compared in the Qf0× Cnormcoordinate system,and the islanding detection of the singlephase photovoltaic grid-connected system is simulated in the environment of MATLAB / Simulink. The results verify that： the feedback coefficient is directly proportional to the islanding detection rate and inversely proportional to the size of NDZ when using AFDPF method; the direction of the initial disturbance varies with the nature of the load,and then the position of NDZ moves upward or downward when using the improved AFDPF method; the improved AFDPF method not only applies to capacitive load and inductive load,but also can reduce NDZ and accelerate the detection rate.

关 键 词：孤岛检测 正反馈 初始斩波因子 检测盲区 带正反馈的主动频移 

分 类 号：TM615[电气工程—电力系统及自动化]