在分布式光伏发电并网系统中，孤岛检测是其必备的基本功能，既要能快速准确地检测出孤岛效应，又要能尽量减小对电能质量的影响。文章介绍了主动式孤岛检测方法的基本原理，将其划分为基于电压偏移原理检测法、基于频率偏移原理检测法和基于相位偏移原理检测法三类，讨论了每种检测方法的优点和缺点，并对每类检测方法的可靠性、对电能质量的影响以及适用场合作了比较。主动式孤岛检测方法的未来研究方向是进一步提高其检测效率、减小或消除检测盲区以及降低对电网的污染度。在实际应用中，合理选用两种或多种不同原理的主动式孤岛检测法相互配合使用，将是主动式孤岛检测法发展的趋势。%In distributed photovoltaic power generation grid-connected systems, islanding detection is an essential function, which requires quick and accurate island effect detection, at the same time with minimum impact on power quality. This paper introduces the basic principle of active islanding detection methods, and divides these methods in-to three types: voltage shift, frequency shift, and phase shift based methods. Advantages and disadvantages of each type of methods are discussed. The reliability, impact on power quality and applied occasions of each type are com-pared. To improve the detection efficiency, reduce or eliminate the blind spot detection as well as reduce the degree of contamination of the grid are the main directions for further research. In practical applications, the rationally com-bined use of two or more different principles will be the trend of active islanding detection methods.
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