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中文摘要：
针对单相光伏并网发电系统中的孤岛效应及其危害。介绍了几种常见的主动式和被动式的检测方法。分析了这几种方法的优缺点，提出并设计了输出电能变动法来实现孤岛效应的检测与防止。在MATLAB7仿真环境下进行建模和仿真，仿真结果表明采用输出电能变动法能很好地检测出孤岛效应的产生。从而有效地实现反孤岛。
英文摘要：
The islanding effect of single phase photovoltaic grid-connected system and its disadvantages was analyzed, some common passive and active detection were introduced, and the advantages and disadvantages of the two detections were generalized. By comparing, an output energy changing method was designed to achieve the detection and prevention of the islanding effect. This system was simulated under MATLAB 7. The results show that the output energy changing method can detect the generation of islanding effect accurately, and achieve the anti-islanding effect effectively.
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