NaS technology allocation for improving reliability of DG-enhanced distribution networks

Reliability calculation is the most important concern in designing and planning of distribution systems, which is considered, in terms of the economical concerns, with minimal interruption of customers. Storage devices are usually used for storing the electric energy while the electric price is low, and deliver their reserved energy when it has financial profit. Also, it could be effective for decreasing the average duration and frequency of outages in load points. In this paper, a method for evaluation of average annual energy not supplied (ENS) for a radial distribution system with DG units and storage devices is presented. Besides, the genetic algorithm (GA) is used to find the optimal capacity and the best location for storage device in order to minimize ENS and installation cost simultaneously. The effectiveness of this method is examined on a real distribution network.