A Novel Quasi-opposition Based Sine Cosine Algorithm for Optimal Allocation and Sizing of Capacitor in Radial Distribution Systems

Abstract

Increasing trend in load demand has introduced many problems in distribution systems like more line losses, low power factor, voltage fluctuations and so on. These issues have become a vital challenge for the power utilities to resolve and maintain the system under healthy conditions. For handling these issues, optimal capacitor placement (OCP) in radial distribution systems employing an optimization approach is explored in this work. The present work proposes a novel application of quasi-opposition based sine cosine algorithm for solving OCP problem. The effectiveness and superiority of the proposed algorithm is verified over other algorithms using different standard benchmark test functions. For solving OCP problem, at first, the most deserving candidate buses for the OCP are identified using a new proposed sensitivity index that helps in reducing search space for the optimization process. Thereafter, by minimizing the losses and maximizing the net annual profit of the system, the optimal location and selection of the fixed-step capacitor banks are obtained. The efficacy of the proposed algorithm has been verified by comparing the results obtained with that of other state-of-the-art algorithms on the standard IEEE 85 bus and 118 bus radial distribution test systems considering full load and variable load scenarios.

A Novel Optimal Shunt Capacitors Placement and Sizing Technique for Cost Minimization

“…By not using any sensitivity-based approach, the proposed approach considered all the buses of the 85-bus radial distribution system as candidate buses on which optimally sized shunt capacitors would be installed. On the other hand, after the combined use of PLI and VDI, Biswal and Shankar [30] considered 16 out of the 84 buses of the 85bus radial distribution system as candidate buses for the installation of shunt capacitors. These buses are 54, 55, 51, 76, 69, 74, 39, 72, 66, 28, 62, 38, 61, 60, 82 and 80.…”

“…However, it can be noted from Table III that the proposed approach identified buses 30, 48, 57, 68 and 81 as the optimum buses for the installation of shunt capacitors. These buses are not part of the top 16 buses that Biswal and Shankar [30] selected. As such it may be stated that the use of the sensitivity-based Fig.…”