Patent ID: 9013152
Filing Date: 2015-04-21
Classification: H02J

Abstract:
1. A power stabilization system comprising: a first power converter which is connected to a power system and performs bidirectional conversion between AC power and DC power; a plurality of battery modules, each battery module including a plurality of secondary batteries of a same type, and the types of the secondary batteries being different for each of the plurality of battery modules; a second power converter provided for each of the plurality of battery modules, wherein the second power converter (i) is connected between the first power converter and the battery module, (ii) converts DC power from the first power converter and charges a secondary battery of the battery module, and (iii) converts electric power charged in the battery module and discharges the converted electric power to the first power converter; and a controller which controls charge or discharge of each of the plurality of battery modules in accordance with a current value of the power system; wherein priorities for charging or discharging battery modules to be charged or discharged are determined by making a first comparison between a charge current or a discharge current of each of the battery modules to be charged or discharged and a reference value, and then making a second comparison between remaining lifetimes of the battery modules to be charged or discharged.