中文摘要：

针对分布式电网系统提出一种新型偶次谐波注入新的主动式孤岛检测方法。详细描述了该检测方法的原理，分析了注入的偶次谐波的取值范围，并详细阐述了检测方法中的滤波算法。此方法是通过在输入电流参考信号中加入一个很小的偶次谐波扰动，由并网和断网前后偶次谐波电压变化来实现孤岛检测。通过MATLAB／Simulink仿真对该方法进行了验证，此方法检测速度快，鲁棒性强，无检测盲区，对电能质量影响小，同时能应用于多台逆变器并联运行的孤岛检测问题等优点。仿真结果达到了预期效果。

英文摘要：

A new active anti-islanding detection method based on injecting the even-order harmonics in the distributed power system was proposed, which fully describes the principle of the detection method and analyzes the range of the even harmonics. This method is based on injecting a small even-order harmonic disturbance in the input current reference signal. The variations of the even-order harmonic voltage under grid-connected and grid-off circumstances were compared. This method was verified by MATLAB/Simulink simulations, and it has a fast detection speed, good robustness, none NDZ, small impact on the power quality and can also be applied to the anti-islanding detection problems for multiple inverters parallel operating systems. The simulations achieve the expected results.