Electric power supply system

摘要

An electric power supply system is provided. The electric power supply system includes charge and discharge devices capable of performing a system interconnection to charge and discharge a power system. At least one of the charge and discharge devices is capable of performing a simulated system operation of supplying electric power of constant power and constant frequency to the power system when an abnormality occurs in a commercial power supply. According to a check result on a state of charge of an electricity storage, electric power supplied from a distributed power supply, and consumption power in a load, the electric power supply system can simultaneously charge or discharge electricity storages of the charge and discharge devices, and preferentially charges the electricity storage of the charge and discharge device performing the simulated system operation, and preferentially discharges the electricity storage of the charge and discharge device performing the system interconnection.

主权项

1. An electric power supply system comprising:
a distributed power supply capable of supplying electric power to a power system that is also supplied with electric power from a commercial power supply and is capable of supplying electric power to a load; a plurality of charge and discharge devices each including a chargeable and dischargeable electricity storage and capable of performing a system interconnection of performing a charging and discharging operation on the power system; a switch device for connecting the commercial power supply to the power system when the commercial power supply is normal, and for disconnecting the commercial power supply from the power system when the commercial power supply has an abnormality; and a control unit for controlling the charge and discharge devices, wherein at least one of the plurality of charge and discharge devices is capable of performing a simulated system operation of supplying the electric power with a constant power and a constant frequency to the power system when the abnormality occurs in the commercial power supply, the control unit including: a charge state obtaining section for obtaining states of charge of the electricity storages; a state checking section for performing a state check based on the states of charge of the electricity storages when the abnormality occurs in the commercial power supply; and a charge and discharge control section capable of simultaneously charging and discharging the electricity storages of the plurality of charge and discharge devices in accordance with a check result of the state checking section, the electric power supplied from the distributed power supply, and consumption power in the load, wherein the charge and discharge control section preferentially charges the electricity storage of the charge and discharge device performing the simulated system operation and preferentially discharges the electricity storage of the charge and discharge device performing the system interconnection.