Load Model Effect Assessment on Optimal Distributed Generation Sizing and Allocation Using Improved Harmony Search Algorithm

Abstract

The operation of a distribution system in the presence of distributed generation systems has some<br />advantages and challenges. Optimal sizing and siting of DG systems has economic, technical, and<br />environmental benefits in distribution systems. Improper selection of DG systems can reduce these<br />advantages or even result in deterioration in the normal operation of the distribution system. DG<br />allocation and capacity determination is a nonlinear optimization problem. The objective function of<br />this problem is the minimization of the total loss of the distribution system. In this paper, the Improved<br />Harmony Search (IHS) algorithm has been applied to the optimization problem. This algorithm has a<br />suitable performance for this type of optimization problem. Active and reactive power demands of the<br />distribution system loads are dependent on bus voltage. This paper verifies the effect of voltage<br />dependent loads on system power characteristics. The load model has an inevitable impact on DG<br />sizing and placement. The proposed algorithm implemented and tested on 69-bus distribution systems<br />and the impact of voltage dependent load models are demonstrated. The obtained results show that the<br />proposed algorithm has an acceptable performance.