Impact Index for Allocating Transportable Energy Storage Systems in Power Distribution Networks

The Transportable Energy Storage Systems (TESSs) have gained interest of power utilities due to the ability to provide power storage services at various locations. Due to their mobile nature, analysis tools must be provided to the distribution control center in order to allow the evaluation of the impacts on the network depending on the TESSs allocation. This paper proposes an index that is easy to calculate and allows the estimation of the impacts of a TESS on voltage limits, automatic voltage regulator operation and technical losses. The proposed index is obtained from the composition of different sensitivity indices with different weights. The TESS allocation has been tested with the proposed index on the IEEE 34-bus system, with a residential load shape and a 1 MW / 1 MWh TESS, which was performing peak-shaving. For this objective, the results indicated the closer the TESS is to the substation, the better are the overall impacts on the system.