Improved Harmony Algorithm for optimal locations and sizing of capacitors in radial distribution systems

• IHA is proposed for optimal allocations and sizing of capacitors.
• The objective function is designed to reduce the total cost.
• The proposed algorithm is tested on various radial distribution systems.
• The effectiveness of IHA is verified compared with other algorithms.

In this paper, an Improved Harmony Algorithm (IHA) is proposed for optimal allocations and sizing of capacitors in various distribution systems. First the most candidate buses for installing capacitors are suggested using Loss Sensitivity Factors (LSF) and Voltage Stability Index (VSI). Then the proposed IHA is employed to deduce the size of capacitors and their locations from the elected buses. The objective function is designed to reduce the total cost and consequently, to increase the net saving per year. The proposed algorithm is tested on 85 and 118 bus radial distribution systems. The obtained results via the proposed algorithm are compared with others to highlight their benefits. Moreover, the results are introduced to verify the effectiveness of the suggested algorithm to minimize the losses and total cost and to enhance the voltage profiles and net saving for various distribution systems and different loading conditions.