Electric power system and server

Patent metadata

Field	Value
Publication number	US-11710983-B2
Application number	US-202117526430-A
Country	US
Kind code	B2
Filing date	Nov 15, 2021
Priority date	Dec 23, 2020
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

In switching of a microgrid from an isolated operation to an interconnected operation with a power grid, a CEMS server determines a first master DER and slaves based on a master plan and performs master-slave control. When the first master DER goes down, the CEMS server compares remaining capacities of power-storage-type DERs included in a DER group. The CEMS server then determines a DER with the highest remaining capacity as a second master DER among the power-storage-type DERs included in the DER group and performs master-slave control.

First claim

What is claimed is:

1. An electric power system comprising:
a plurality of power adjustment resources electrically connected to a first power grid; and
a management apparatus that manages electric power of the first power grid, wherein
the first power grid is configured to be connected to and disconnected from a second power grid,
when the first power grid is connected to the second power grid and performs an interconnected operation with the second power grid, the management apparatus performs current control of the plurality of power adjustment resources to be synchronized with a frequency of the second power grid,
when the first power grid is disconnected from the second power grid and performs an isolated operation, the management apparatus determines a prescribed power adjustment resource as a master, determines power adjustment resources other than the prescribed power adjustment resource as slaves, and performs master-slave control of the plurality of power adjustment resources, the prescribed power adjustment resource being a power adjustment resource determined in advance among the plurality of power adjustment resources, and
when the prescribed power adjustment resource fails to operate in the isolated operation of the first power grid, the management apparatus determines the master from among the plurality of power adjustment resources based on information about an amount of electric power of the plurality of power adjustment resources, determines, as slaves, power adjustment resources other than the master determined, and performs the master-slave control of the plurality of power adjustment resources.

2. The electric power system according to claim 1 , wherein
the information about an amount of electric power is information indicating a current power storage capacity, and
in the master-slave control, the management apparatus determines, as the master, a power adjustment resource with a highest power storage capacity among the plurality of power adjustment resources and determines, as slaves, power adjustment resources other than the master determined.

3. The electric power system according to claim 2 , wherein in the master-slave control, when a power storage capacity of the master falls below a threshold capacity, the management apparatus determines, as a new master, a slave with a highest power storage capacity among the slaves and determines, as a slave, a power adjustment resource that has served as the master.

4. The electric power system according to claim 1 , wherein
the information about an amount of electric power is information indicating an SOC, and
in the master-slave control, the management apparatus determines, as the master, a power adjustment resource with a highest SOC among the plurality of power adjustment resources and determines, as slaves, power adjustment resources other than the master determined.

5. The electric power system according to claim 4 , wherein in the master-slave control, when an SOC of the master falls below a threshold SOC, the management apparatus determines, as a new master, a slave with a highest SOC among the slaves and determines, as a slave, a power adjustment resource that has served as the master.

6. A server that manages electric power of a first power grid electrically connected with a plurality of power adjustment resources,
the first power grid being configured to be connected to and disconnected from a second power grid,
the server comprising:
a storage that stores information about an amount of electric power of the plurality of power adjustment resources; and
a controller, wherein
when the first power grid is connected to the second power grid and performs an interconnected operation with the second power grid, the controller performs current control of the plurality of power adjustment resources to be synchronized with a frequency of the second power grid,
when the first power grid is disconnected from the second power grid and performs an isolated operation, the controller determines a prescribed power adjustment resource as a master, determines power adjustment resources other than the prescribed power adjustment resource as slaves, and performs master-slave control of the plurality of power adjustment resources, the prescribed power adjustment resource being a power adjustment resource determined in advance among the plurality of power adjustment resources, and
when the prescribed power adjustment resource fails to operate in the isolated operation of the first power grid, the controller determines the master from among the plurality of power adjustment resources based on the information about an amount of electric power, determines, as slaves, power adjustment resources other than the master determined, and performs the master-slave control of the plurality of power adjustment resources.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hamada Shigetaka
• Hirose Haruka
• Horii Yusuke
• Nakamura Toru
• Sano Takaaki

Classifications

• H02J13/333

  the equipment forming part of substations · CPC title

• H02J13/1337 Primary

  involving the use of Internet protocols · CPC title

• H02J2101/40

  Hybrid power plants, i.e. a plurality of different generation technologies being operated at one power plant · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J2101/24

  Photovoltaics · CPC title