Abstract
Battery energy storage system (BESS) is expected to suppress fluctuation derived from increasing amount of renewable power generation, such as wind and solar. Depending on the variation to be suppressed, BESS capacity and their initial costs increase. We studied a method to realize fluctuation suppression for wind power BESS system. In this method, we developed control method using wind velocity and long period power variation of power grid in order to reduce BESS capacity. Sum of wind power and BESS output is supposed to be controlled in accordance with report of request for grid-interconnection with wind power. Using wind velocity and long period power variation values, power reference of BESS charge and discharge were calculated to settle proper state of energy of BESS by using measured single wind power system field data. As the result, comparing conventional without power control case and proposal case for BESS, in the case of proposal control, the BESS capacity can be decreased to 60% of rated wind power generator.
