Majid Daghi - Faculty of Electrical Engineering K. N. Toosi University of Technology Tehran, Iran
Mahdi Sedghi - Faculty of Electrical Engineering K. N. Toosi University of Technology Tehran, Iran
Masoud Aliakbar-Golkar - Faculty of Electrical Engineering K. N. Toosi University of Technology Tehran, Iran

The battery energy storage units bring many benefits to the distribution networks. However, they may result in a high cost, if they are not used in optimal manner. Optimal sizing as well as the optimal typing of batteries is very important from both technical and economic points of view. In this paper, the optimal planning of the batteries in a grid connected distributed energy system is presented considering the most famous technologies of the batteries. As there is not specified value for the economic and technical parameters of the batteries, the expected values are used in case studies. This study determines which technology is the most suitable one to be used in the grid connected distributed generation systems. The numerical results show that selecting the optimal technology of the batteries affects the cost of energy considerably, and it should not be neglected in optimal planning. The sensitivity analyses represent the impact of wind energy, peak load and the price factor on optimal typing of the batteries.

Energy storage, Batteries, Distributed generation, Wind energy