  A novel method for achieving a better performance using the combination of
the available passive and active methods has been proposed. The algorithm
detects the islanding in proper time by using harmonic detection, the average
rate of change of voltage and shifting power generation. Harmonic detection in
this method decreases process time and also differentiates between islanding
and other power systems events. For harmonic detection, extended Kalman filter
has been used. Besides, the reliability of the method increases using the
average rate of change of the voltage. The proposed method uses a strategy for
decreasing the non-detection zone. In this strategy, minimum and maximum
average rates of change of voltage limits are defined to improve the security
of the system. Therefore, three main specifications of a proper method,
reliability, security and time of process are achievable by the combination of
these passive and active methods. By applying different power system events
under different power conditions, the proposed method has been verified in
Simulink software.
