Capacitor Allocation in Distribution Systems Using Fuzzy Loss Sensitivity Factor with Sine Cosine Algorithm

This paper aims to propose an optimization method for optimal allocation of shunt capacitors in distribution networks to minimize the total active power losses and total energy cost with enhancing the voltage profile. The proposed method is carried out using two stages. In the first stage, candidates' buses are determined using fuzzy logic control based on Normalized Loss Sensitivity Factor (NLSF) and voltage magnitude at each bus. The system buses are ordered descending based on the fuzzy output where the highest buses are chosen as candidate buses. In the second stage, a recent metaheuristic technique, Sine Cosine Algorithm (SCA), is used to calculate the shunt capacitor size where the candidate buses are used as initialized locations to decrease the search area of SCA. The final optimal size and location of shunt capacitors are specified through the SCA iterative process. The developed optimization method is comprehensively compared with the other optimization methods used for the same pattern to prove its effectiveness. The simulation results are performed on the 15-bus and 69-bus distribution networks using MATLAB M. Files.