Department of Electrical and Robotic Engineering, Shahrood University of Technology, Shahrood, Iran
The penetration level of the photovoltaic (PV) systems is growing in the distribution networks throughout the world. On the other hand, the voltage drop across the feeder and the voltage imbalance are important issues in radial distribution networks. One of the most effective methods to deal with these problems is reactive power injection by PV-based multiple distributed static compensators (D-Statcom). Hence, a method based on the integral to droop line algorithm, which can regulate the reactive current injection for the voltage control by optimizing the droop coefficient and integral gain, has been proposed in this paper. Therefore, genetic algorithm (GA) is used to minimize the voltage deviation (VD) and voltage unbalanced factor (VUF). The proposed method has been simulated and evaluated on the typical low voltage (LV) 3-phase distribution network. The results indicate that the voltage profile along the feeder has been improved from a poor range to the acceptable range of 0.95 to 1.05, and therefore VUF’s reach to under 0.15. Hence, optimal use of PV-Dstatcom’s capacity and validity of the mentioned method are obtained.