Abstract
Dispersed generations have been developed considering effective utilization of energy. Then a reverse power interconnection of generators is required to utilize power effectively. In Japan, “GUIDE LINE” was revised considering these situations. Then if a relay system which protects distribution systems and dispersed generators had two islanding detection methods (active and passive methods), the reverse power interconnection was made possible. Islanding detection method for synchronous generators have been developed (5) (6). However the previous methods do not take an active method into account and methods can not detect all islanding cases. Authors proposed two active islanding detection methods for synchronous generators. These two methods utilizes frequency deviation according to a active perturbation signal.
This paper presents an equivalent transformation technique for the proposed two methods. Theoretical basis, analysis, practical issues and implementation of the technique are described. The proposed technique was tested using a simulation and a field test plant.
