Solution of optimal reactive power dispatch by chaotic krill herd algorithm

This study presents an efficient and reliable evolutionary-based approach, termed as chaotic krill herd algorithm (CKHA), to solve the optimal reactive power dispatch (ORPD) problem of power system. In the proposed CKHA, various chaotic maps are considered to improve the performance of the basic KHA. The performance of the proposed CKHA is examined and tested, successfully, on standard IEEE-30 and IEEE-57 bus test power systems for the solution of ORPD problem in which control of bus voltages, tap position of transformers and reactive power sources are involved. The objective function considered is either minimisation of active power transmission loss or that of total voltage deviation or enhancement of voltage stability index. The results offered by the proposed CKHA are compared with those offered by other evolutionary optimisation techniques surfaced in the recent state-of-the-art literature. Simulation results indicate that the proposed CKHA yields superior solution over the other recently surfaced popular techniques in terms of effectiveness and convergence speed.