An optimal Fuzzy-PI Stabilizer to compensate Low Frequency Oscillations using Kho-Kho Optimization Technique

Abstract

Low frequency oscillations (LFOs) are one of the primary reasons of power transmission unpredictable. LFOs are generally classified as the disturbances with small signal stability in the linked power system. Thereby, it is important that these oscillations in the linked power system are regulated. This is why power system stabilisers are employed to dampen the oscillations and maintain the stability of the system. Here, in this work, an optimal proportional integral (PI) stabiliser based on fuzzy logic is developed, which is capable of suppressing the LFO in linked systems. The parameters of the suggested stabiliser are calibrated using a Kho-Kho optimization (KKO) scheme. To optimise the controller variables, a fitness function is constructed using the integral time square error (ITSE). An OMIB with an IEEE type DC-1 exciter unit is considered in order to illustrate the efficacy of the recommended optimal controller design. Comparison of findings obtained with those of other approaches are used to demonstrates the superiority of the recommended strategy.