Reactive power optimization for distribution system with distributed generations based on AHSPSO algorithm

Abstract

Distributed generation (DG) has significant effects on the voltage quality and economic operation of distribution network. Taking reactive powers supplied by DGs and reactive power compensation equipment as control variables, the reactive power optimization problem in distribution power system with DGs is researched and an adaptive harmony search-particle swarm optimization (AHSPSO) algorithm is proposed. Considering economic factors, the multi-objective reactive power optimization model of distribution power system with DGs is established firstly. Then a new hybrid algorithm — AHSPSO algorithm is proposed based on the improved harmony search (HS) algorithm and particle swarm optimization (PSO) algorithm. Compared with original HS and PSO in a modified IEEE 33-bus system simulation analysis, the results show that the proposed algorithm has stronger global search capability, higher convergence accuracy and faster convergence rate. Besides, taking DG as a mean of reactive power compensation can effectively reduce the power loss and improve the node voltage level. AHSPSO algorithm is suitable for solving the reactive power optimization problem in distribution power system with DGs.