Reactive Power Optimization Based on IGSO and Harmonic Voltage Distortion

In recent years, power electronic devices have been widely used and caused harmonic pollution. If the power system is optimized directly under the harmonic frequency, the harmonic resonance or harmonic amplification between the system and the capacitor is apt to occur, which will lead to increase of harmonic distortion and damage the safety operation of the power system. A mathematical model of reactive power optimization is proposed with consideration of harmonic voltage distortion. Based on the minimum network loss, the fundamental voltage and the total harmonic distortion over the limit of each node were added to the target function by the form of penalty terms and the improved glowworm swarm optimization(IGSO) was applied to reactive power optimization. The specific procedures for reactive power optimization based on IGSO and harmonic voltage distortion are given in this paper. A simulation of the IEEE 30-bus case was conducted to test the feasibility and the superiority of this method. The results of this optimization show that this method reduces the network loss and total harmonic distortions, and has a better convergence efficiency and a higher computational precision.