A Novel Islanding Detection Method Using 5-th Harmonic Voltage Content with Blocking Filter Device

Aiming at the problems of large blind area and low sensitivity of traditional passive islanding detection method for electric quantity change in harmonic domain, a new islanding detection method using 5-th harmonic voltage content with blocking filter device is proposed. The principle of the micro grid islanding detection scheme based on the 5-th harmonic voltage content is to judge whether the islanding effect occurs by detecting and comparing the changes of 5-th harmonic voltage content at the common coupling point before and after the blocking filter device. This paper introduces the process of the islanding detection scheme using the blocking filter device and the 5-th harmonic voltage content. Through theoretical analysis and MATLAB simulation, the correctness, economy, rapidity and reliability of the proposed method are verified.