Impact of Battery Energy Storage Systems with Power Electronic Interface at the Grid Connection Point

The electrical energy system has to manage an increasing share of renewable energy sources while conventional power plants will be shut down soon. New technologies are necessary to secure the ancillary services and offer flexibility. Battery energy storage systems (BESS) can react very fast, they are a good option to support power system stability. However, detailed overall system simulations are necessary to identify the optimal design and operation in the power system, converter and battery. This paper examines system aspects of battery energy storage systems BESS consist of a high power off-grid converter fed by a battery. For this investigation, a converter being controlled as a virtual synchronous machine is connected to a grid and typical scenarios are simulated which permits to determine operational parameters and the achieved effect on grid stabilisation.