中文摘要：

将现代特征识别技术移植至孤岛检测方法中，提出一种基于特征识别的孤岛检测技术，通过对逆变器系统进行特征分析与提取。将实际检测到的相关参数与逆变器正常并网时的特征参数进行比对，从而判断出孤岛的发生。为避免误判断，提高孤岛检测的实时性，增加了交流侧电压纹波正反馈环节，变被动式检测为主动式检测。仿真和实验结果表明：所提出的孤岛检测方法能有效、快速地检测出孤岛。

英文摘要：

An active islanding detection method is proposed based on moden recognition technology.h can identify the features of the inverter system and calculate the quantizing distortion.The theoretical value of the features can be de- fined as codebooks.The quantizing distortion is the deviation of the actual value of the features and the codebooks. When islanding happens ,the quantizing distortion will exceed the threshold value.Thus islanding can be detected.To accelerate the speed of detection and avoid miscalculation, a voltage positive feedback method based on the modem features recognition technology is proposed and the quality of grid-current will not be affected.Simulation and experi- mental results verify the theoretical analysis.