摘要
针对目前常规主动式频率偏移法在户用型并网逆变器的孤岛检测中存在检测盲区的情况,本文提出一种改进算法。改进后的算法从正反两面施加频率的扰动,以消除负载对单一频率扰动方向的平衡作用。给出了系统的MATLAB/Simulink仿真模型,结果表明:改进型算法能够及时判断出施加频率的扰动方向,从而在2s内检测出孤岛。
According to the fact that the existing conventional AFD spots none-detection zone through the island detection of household grid-connected inverter, a new improved AFD method is provided in this paper. Being different from conventional AFD, the new method can eliminate the counterbalance for the load on the influence of single frequency disturbance by way of putting frequency disturbance on positive and negative sides. Then a system simulation model based on the MATLAB/Simulink comes into being. It turns out to be that the improved AFD method can immediately estimate the direction of perturbation of applied frequency, and detects it in 2 seconds.
出处
《电测与仪表》
北大核心
2013年第3期41-44,共4页
Electrical Measurement & Instrumentation
基金
天津市科技发展基金支撑重点资助项目(09ZCKFGX01800)
关键词
AFD
孤岛检测
检测盲区
单相并网
改进型AFD
AFD, island detection, none-detection zone, single-phase grid-connected, improved AFD
