Patent ID: 11862978
Assignee: PANASONIC HOLDINGS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power supply system comprising:
a plurality of power supply units, and;
a control system to which the power supply units are parallel connected,
wherein each of the power supply units includes:
a battery aggregation including a plurality of secondary battery cells serial and parallel connected;
a unit controller that acquires battery information about electric power at which the battery aggregation is chargeable and dischargeable and that outputs the battery information to the control system; and
a switch provided in each of the power supply units and configured to switch connection and disconnection between the power supply unit and the control system,

wherein the control system includes:
a power conditioner that is parallel connected to the plurality of power supply units and is connected to an external power system, and receives electric power from the power system and charges the plurality of power supply units with the received electric power, and receives electric power from the plurality of power supply units and discharges the received electric power to the power system;
a master controller that collects the battery information output from the unit controller of each of the power supply units; and
a system controller that communicates to the power conditioner, electric power required to the power supply system as a power command, and

wherein, in a case where the power conditioner determines, according to the power command from the system controller, a working total power POBall, which is a summation of electric power at which each of the power supply units is charged and discharged,
the power conditioner determines possible total power SOPall at which all the power supply units are chargeable and dischargeable to be in a range that possible individual power SOP of each of the power supply units is not exceeded,
the possible total power SOPall being determined from the possible individual power SOP, of each of the power supply units, determined based on the battery information detected by each of the unit controllers, collected by the master controller from each of the unit controllers,
the power conditioner causes charging and discharging of each of the power supply units within a working individual power POB of each of the power supply units,
wherein
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 a power deviation indicating a difference of a charging and discharging power between the power supply units, 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.