摘要
介绍了光伏并网系统的工作原理及其孤岛效应现象,并网逆变器采用基于重复控制补偿的PI控制方法,孤岛效应识别方法采用主动频率偏移法,并在MATLAB/SIMULINK下分别进行了系统的建模与仿真。结果表明:输出并网电流波形良好,其基本实现并网电流的无误差跟踪,和电网电压同频同相,并可以有效地检测出系统的孤岛效应。
The operational principles of PV grid-connected system and its islanding are analyzed in this paper. Then a simulation model of the PV grid-connected system is established in Matlab. In our model, the gridconnected inverter adopts the PI control method based on repetitive control current feedback, and the identification method of islanding relies on active frequency drift method. The simulation results prove that the output wave of the grid-connected current is good and has the same frequency and phase as the utility grid. Meanwhile, the islanding can be detected effectively in this model.
出处
《电源技术应用》
2009年第3期12-15,共4页
Power Supply Technologles and Applications
关键词
光伏并网
重复控制
孤岛效应
频率偏移
PV Grid-connected System
Repetitive Control
Islanding
Frequency Drift
