A Correlation Factor Based Islanding Detection Method for Distributed Synchronous Generators

摘要

This paper proposes a new correlation factor based islanding detection method for use of grid-connected distributed synchronous generator. The proposed correlation factor method is based on voltage fluctuation injection, which can be obtained through regulating the field current of the distributed synchronous generator periodically. The correlation factor between the periodic regulating signal and the perturbed voltage is then used as an islanding detection index. When distributed synchronous generator is grid-interconnected, the correlation factor is lower than a threshold value. In contrast, as an islanding occurs, the correlation factor would become much higher than the threshold value. In this paper, experiments are conducted to illustrate the principles of the proposed technique. The test results show that the new proposed method is reliable, economical, and easy for implementation for islanding detection of distributed synchronous generator.