Power conversion system

A power conversion system comprising:

• a plurality of storage battery power converters provided for each of a plurality of storage batteries used as input power supplies, the storage battery power converters operating the storage batteries in parallel;
• a degradation information acquisition device that acquires degradation information of the storage batteries;
• a temperature information acquisition device that detects temperature information of the storage batteries;
• and
• a control device that controls the storage battery power converters based on the degradation information of the storage batteries by the degradation information acquisition device and the temperature information of the storage batteries by the temperature information acquisition device,
• wherein, based on progress of degradation of the storage batteries acquired by the degradation information acquisition device, the control device controls charge and discharge of the storage batteries by performing:
• an operation for making a usable temperature range of a storage battery of the storage batteries that has been more degraded equal to or smaller than the usable temperature range of a storage battery of the storage batteries that has been less degraded, and
• at least one of an operation for making a maximum charge and discharge current with respect to a storage battery temperature of the storage battery having been more degraded equal to or smaller than the maximum charge and discharge current of the storage battery having been less degraded and an operation for making a usable voltage range with respect to the storage battery temperature of the storage battery having been more degraded equal to or smaller than the usable voltage range of the storage battery having been less degraded.