A new approach to islanding detection of dispersed generators with self-commutated static power converters

In this paper, an islanding detection approach for dispersed generators with a self-commutated static power converter is proposed. This method is suggested based on the monitoring of the magnitude and sign change in ∂f_B/|∂P_L. To facilitate the detection process, a designated circuit for generating the output power deviation is also developed. The proposed method has been tested under various scenarios in order to examine the detection performance and operation reliability. It is found that the proposed method effectively detects the islanding event when different amount of power mismatch is considered. Moreover, by employing the simulated disturbances to the test system, the outcome reveals that the probability of false alarm is low. Test results solidify the feasibility of the method for the application considered