US 2023/0411964 A1Published application

Thermal power unit-flywheel energy storage cooperative frequency regulation control method and system

AssigneeNorth China Electric Power University

InventorsFENG HONG, LU LIANG, XINYI JIA, JUNHONG HAO, YANJUN DU, WEI WANG, FANG FANG

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Abstract

A thermal power unit-flywheel energy storage cooperative frequency regulation control method and system is provided, which belongs to the technical field of a power grid. First, a real-time output increment of a thermal power unit is predicted, then a real-time frequency regulation power instruction of a flywheel energy storage system is determined based on the predicted real-time output increment of the thermal power unit, and finally the frequency regulation power instruction of the thermal power unit is determined by a difference adjustment coefficient of a governor and a grid frequency deviation. The thermal power unit and flywheel energy storage system is cooperatively controlled by frequency regulation based on the real-time output increment predicted value of the unit, which realizes self-adaptive adjustment of output of the flywheel energy storage system under dynamic working conditions, and improves the grid frequency stability and operation safety of the thermal power unit.

Claims8

Dependent claims

A thermal power unit-flywheel energy storage cooperative frequency regulation control method, comprising:

obtaining a real-time operating parameter of a thermal power unit, a difference adjustment coefficient of a governor, a grid frequency deviation, a current state of charge of an energy storage battery and a rated power of an energy storage system;
obtaining a predicted value of an output power increment of the thermal power unit by using a dynamic model of the thermal power unit according to the real-time operating parameter of the thermal power unit;
determining an initial power instruction of a flywheel energy storage system according to the predicted value of the output power increment of the thermal power unit, the difference adjustment coefficient of the governor and the grid frequency deviation;
obtaining a real-time maximum discharge power of the flywheel energy storage system by using a Logistic regression function according to the current state of charge of the energy storage battery and the rated power of the energy storage system;
selecting a minimum value between the real-time maximum discharge power of the flywheel energy storage system and the initial power instruction of the flywheel energy storage system as a real-time frequency regulation power instruction of the flywheel energy storage system, and sending it to the flywheel energy storage system;
determining a frequency regulation power instruction of the thermal power unit according to the difference adjustment coefficient of the governor and the grid frequency deviation, and sending it to the thermal power unit.

3 more elements

A thermal power unit unit-flywheel energy storage cooperative frequency regulation control system, comprising:

a parameter obtaining module configured to obtain a real-time operating parameter of a thermal power unit, a difference adjustment coefficient of a governor, a grid frequency deviation, a current state of charge of an energy storage battery and a rated power of an energy storage system;
an increment prediction module configured to obtain a predicted value of an output power increment of the thermal power unit by using a dynamic model of the thermal power unit according to the real-time operating parameter of the thermal power unit;
an initial power instruction determining module configured to determine an initial power instruction of a flywheel energy storage system according to the predicted value of the output power increment of the thermal power unit, the difference adjustment coefficient of the governor and the grid frequency deviation;
a real-time maximum discharge power obtaining module configured to obtain a real-time maximum discharge power of the flywheel energy storage system by using a Logistic regression function according to the current state of charge of the energy storage battery and the rated power of the energy storage system;
a flywheel real-time frequency regulation power instruction sending module configured to select a minimum value between the real-time maximum discharge power of the flywheel energy storage system and the initial power instruction of the flywheel energy storage system as a real-time frequency regulation power instruction of the flywheel energy storage system, and send it to the flywheel energy storage system;
a thermal power unit frequency regulation power instruction sending module configured to determine a frequency regulation power instruction of the thermal power unit according to the difference adjustment coefficient of the governor and the grid frequency deviation, and send it to the thermal power unit.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/334,153Filed 13 Jun 2023
Priority: CN 202210672280.514 Jun 2022
Published: 21 Dec 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02J 3/30
Arrangements for balancing of the load in networks by storage of energy: using dynamo-electric machines coupled to flywheels
H02J 3/0014
Arrangements for handling faults or abnormalities, e.g. emergencies or contingencies: for preventing or reducing power oscillations in networks
H02J 3/28
Circuit arrangements for AC mains or AC distribution networks: arrangements for balancing of the load in networks by storage of energy
H02J 3/32
Arrangements for balancing of the load in networks by storage of energy: using batteries or super capacitors with converting means

Family

US 12,136,818 B2Related patent
US 2023/0411964 A1This patent

From the US filing history. Foreign family members aren’t listed.

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