BATTERY CONTROL SYSTEM

摘要

A battery control system is disclosed for controlling a set of batteries which are arranged to be charged from and to supply power to a multi-phase AC power line. The multi-phase AC power line comprises a neutral connection (24), and the set of batteries comprises a first battery (16) and a second battery (18) connected in series with a mid-point of the batteries connected to the neutral connection. The system comprises conversion means (20) for converting an AC input on the AC power line to DC for charging the set of batteries in a first mode of operation, and for converting a DC input from the set of batteries to AC for supply to the AC power line in a second mode of operation, and control means (26) for controlling operation of the conversion means. The control means is arranged to control the conversion means such that, during the first mode of operation, the conversion means balances the state of charge of the first battery and the second battery.