Control of a battery energy storage system to compensate for ADN equivalents inaccuracies

This paper proposes a new application for a Battery Energy Storage System (BESS) connected at distribution level. It consists of controlling the BESS in such a way that the net active and reactive powers entering the distribution network matches as closely as possible the response of a dynamic equivalent model of the latter, used in large-disturbance dynamic simulations of the transmission system. Thus, the BESS compensates for the inevitable inaccuracies of the equivalent, which can be used with higher guarantee of accuracy. The battery is supposed to be available for other purposes at the main substation of the distribution grid. Its active and reactive powers are controlled without resorting to any model of that grid. Simulations results are reported on the CIGRE MV test system. Good performances are found in response to disturbances of various severities.