Abstract
This paper proposes the two-step approach for improving the voltage profile of the distribution network (DN) using the optimal integration of photovoltaic-battery energy storage (PV-BES) system. In the first step of the approach the optimal location of the PV-BES system in the DN and its optimal powers are determined, considering the topology and the load of the DN. This is done to improve the voltage profile of the DN using the meta-heuristic wild horse optimization method (WHO) and genetic algorithm (GA). The second step of the approach determines the optimal sizing of the PV-BES system, by taking into account the optimal powers obtained in the first step, the solar irradiance diagram and the average temperature for each month of the year for the area in which the DN is located. The optimal sizing includes optimal maximum power of the PV system and the optimal maximum power and energy capacity of the BES unit, determined by the proposed iterative method. The results are generated using the topology of the IEEE 18-bus radial DN for three different load diagrams, on a monthly and annual basis.