一种混合低谐无盲区的孤岛检测方法

Hybrid Low-harmonic Islanding Detection Method Without Non-detection Zone

主动式检测方法作为一种常用的孤岛检测方法,虽然可以通过增加扰动强度使孤岛检测盲区得以减小,但同时会增大对电网的谐波污染程度。针对此问题,提出了一种混合模糊低谐无盲区的孤岛检测方法,即首先对盲区进行判断,优先使用对电网无谐波污染的被动式孤岛检测方法,若此时处于被动式检测方法盲区之内,则使用一种具有模糊扰动控制的对输出电流第二、四个1/4周期进行扰动的模糊低谐孤岛检测方法。最后搭建相应的仿真模型对所提方法的有效性进行验证。

As a commonly used islanding detection method,the active detection method can reduce the non-detection zone by increasing the disturbance intensity,but it will also increase the degree of harmonic pollution to the grid at the same time.Aimed at this problem,a hybrid fuzzy low-harmonic islanding detection method without non-detection zone is proposed in this paper.First,the non-detection zone is judged,and the passive islanding detection method which has no harmonic pollution to the grid is used preferentially.If this zone is within the non-detection zone of the passive detection method,then a fuzzy low-harmonic islanding detection method with fuzzy disturbance control is used to disturb the output current in its second and fourth quarter periods.Finally,the corresponding simulation model is built to verify the effectiveness of the proposed method.