AN ENERGY STORAGE DEVICE FOR A POWER COMPENSATOR AND A METHOD FOR CONTROL THEREOF

摘要

An energy storage device (1) for a power compensator comprising a battery stack including a plurality of battery units (2-4) connected in series, each of the battery units comprising one or more parallel- connected battery modules (5-13) including a plurality of battery cells, where each battery unit (2-4) further comprises a bypass switch (14-16) connected in parallel with the battery modules and the energy storage device comprises a control unit (21-22) which is operatively connected to the bypass switches and adapted to receive information on a failure in any of the battery modules and to close the bypass switch in order to bypass the battery unit in case of a failure in any of the battery modules of the battery unit.