Patent ID: 11862978
Assignee: PANASONIC ENERGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A power control method in a power supply system including a plurality of power supply units and a control system to which the plurality of power supply units are parallel connected, the power control method comprising:
receiving, by the control system, electric power required to the power supply system as a power command;
acquiring battery information about electric power at which a battery aggregation included in each of the power supply units is chargeable and dischargeable, and outputting the acquired battery information to the control system, the battery aggregation including a plurality of secondary battery cells serial or parallel connected;
determining, based on the battery information of the power supply units:
possible individual power SOP indicating electric power at which each of the power supply units is chargeable and dischargeable;
possible total power SOPall indicating electric power at which all the power supply units are chargeable and dischargeable; and
a power deviation indicating a difference of a charging and discharging power between the power supply units, and
determining, based on the determined possible individual power SOP, the determined possible total power SOPall, the determined power deviation, and the power command, working individual power POB in a range that the working individual power POB does not exceed the possible individual power SOP of each of the power supply units, the working individual power POB being electric power at which each power supply unit is charged and discharged,
wherein
a switch is provided in each of the power supply units and configured to switch connection and disconnection between the power supply unit and the control system,
each of the power supply units connected in parallel is connected via the corresponding switch to the control system including the power conditioner, such that the power supply units are directly connected in parallel without the control system therebetween where each switch establishes connection between the corresponding power supply unit and the control system,
the possible total power SOPall at which all the power supply units are chargeable and dischargeable is determined based on the possible individual power SOP of each of the power supply units and the power deviation, and
the working individual power POB for charging and discharging of each of the power supply units is determined so as not to exceed the possible individual power SOP of each of the power supply units.