Comparison of digital simulation and field test results of islanding detection system for synchronous generators

This paper presents two islanding detection methods for a dispersed synchronous generator and equivalent transformation techniques between the proposed two methods. The first method can be applied to a newly installed synchronous generator and the second method can be applied to an existing synchronous generator. The proposed two methods have the ability to detect all islanding cases, while the previous method has problems for detecting some islanding cases. The proposed methods and the equivalent transformation techniques were verified through a digital simulation and a field test. The islanding detection time of the simulation and the field test coincide perfectly. The results reveal the effectiveness of the proposed methods and the equivalent transformation techniques.