ANALYSIS OF A NOVEL SLIDING MODE FREQUENCY SHIFT ISLANDING DETECTION METHOD

This paper deals with a detailed analysis of a new modified Sliding Mode Frequency Shift (new-SMFS) method which is used for detecting an islanding situation in a power system. As compared to the original Sliding Mode Frequency Shift (SMFS) detection method which uses a sinusoidal function for the phase perturbation in the reference value of inverter current, the new-SMFS method uses a non-sinusoidal function for the phase perturbation in the reference value of inverter current. This new-SMFS method is an improvement over the original SMFS method having improved detection time, better damping ability and a highly reduced Non – Detection Zone (NDZ). Even if it is an active islanding detection technique, the deterioration in power quality of the overall system is drastically reduced. The effect of various parameters in the new-SMFS method on the detection time, damping ability, NDZ and tripping action of the circuit breaker on the distributed generation (DG) side has been performed. The software used for this analysis is MATLAB – Simulink.