A comparison of Under Frequency Relay based and Frequency Response model based Load Shedding scheme

The power system in Industrial plants is continually prone to unforeseeable contingencies which cause a disparity between power generated and the load demand. Such uncertainties make the system frequency to decay. In this work, frequency response due to load-generation mismatch is simulated. To forestall this dramatic event, under- frequency Load Shedding (UFLS) strategies are adopted. This paper focuses on the traditional Under Frequency Relay based load shedding and the adaptive System Frequency Response (SFR) model based load shedding. SFR model is developed in MATLAB-SIMULINK. Load shedding actions of both methods are simulated and compared in a test system in ETAP software to comprehend frequency response of an industrial system under transient conditions.