Improvement of Islanding Detector Using Interharmonics Current Injection Method and Its Applications

摘要

When distributed power sources, such as renewable energy sources, are interconnected to electric power grids, anti-islanding protection devices are necessary. In 2001, we developed an islanding detector using the interharmonics current injection method, and since then it has been widely used. This paper introduces the principle, fault ride through (FRT) capability, and applications of the detector.