摘要
随着分布式供电系统的逐步发展,反孤岛控制已成为并网供电中不可缺少的环节。文中结合光伏并网逆变器的控制过程介绍了几种传统的反孤岛方法,分析了这些方法中的检测盲区,详细介绍了正反馈频率法的控制原理和控制过程,并给出程序控制流程图,运用M atlab对该方法进行了仿真。仿真结果表明该方法能够快速地检测出孤岛的发生并断开逆变器与电网的连接,无检测盲区,对孤岛效应能够做到有效的防范。
With the development of distributed power supply system, anti-islanding control has become an indispensable component in power supply system. In this paper, integrating with the control of PV inverter, several traditional anti island approaches are introduced and the non-detection zone in these methods are analyzed. The control principle and control process of the method of positive feedback are presented in detail. Also the flow chart of program control is given. Then the method is simulated by Matlab. The simulation results shows that this method can rapidly detect the occurrence of islanding and disconnect the inverter with the grid without non-detection zone So that the islanding can be effectually prevented with this method.
出处
《通信电源技术》
2008年第6期20-22,共3页
Telecom Power Technology
关键词
光伏
并网
正反馈
孤岛
photovoltaic
grid-connected
positive feedback
island
