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Flywheel array energy storage system with multiple parallel-connected flywheel energy storage units

A flywheel energy storage and energy storage system technology, which is applied in the field of high-power flywheel array energy storage systems, can solve the problems of free addition of flywheel energy storage units and poor system scalability, and achieve the effect of improving flexibility and adaptability

Inactive Publication Date: 2015-06-03
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The capacity of the system is limited by the grid-connected inverter, and it is impossible to freely add new flywheel energy storage units inside the system, and the scalability of the system is not strong

Method used

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  • Flywheel array energy storage system with multiple parallel-connected flywheel energy storage units
  • Flywheel array energy storage system with multiple parallel-connected flywheel energy storage units
  • Flywheel array energy storage system with multiple parallel-connected flywheel energy storage units

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Embodiment Construction

[0019] figure 1 Shown is a specific embodiment of the principle of the flywheel array energy storage system of the present invention. like figure 1 As shown, a flywheel array energy storage system 105 that can be directly connected to an AC grid 100 is composed of a common AC bus 200, a grid-connected static switch 104, and more than two flywheel energy storage units and their unit controllers. Wherein, the public AC bus 200 is composed of A phase 200a, B phase 200b, and C phase 200c, and each flywheel energy storage unit is connected to the public AC bus 200 in parallel. Therefore, the three AC-side outlets of each flywheel energy storage unit are respectively connected to the A-phase 200a, B-phase 200b, and C-phase 200c of the common AC bus 200 . For example, the first lead-out end 411 of the AC side of the first flywheel energy storage unit 300 is connected to the A-phase 200a of the public AC bus 200, the second lead-out 412 is connected to the B-phase 200b of the public...

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Abstract

The invention discloses a flywheel array energy storage system with multiple parallel-connected flywheel energy storage units. The flywheel array energy storage system comprises a public alternative current bus, a grid-tied static switch, a flywheel array controller, at least two flywheel energy storage units and unit controllers of the flywheel energy storage units, wherein the internal structures and the parameter characteristics of the flywheel energy storage units are completely identical; the flywheel energy storage units are tied into the public alternative current bus in a current source mode; and the number of the flywheel energy storage units can be increased or decreased randomly. According to the flywheel array energy storage system, a hierarchy control mode is adopted; a power necessary for maintaining the power balance of an alternative current grid is calculated by the flywheel array controller as an upper hierarchy controller, and the power is distributed to each flywheel energy storage unit controller by using a coordination control algorithm; and the unit controllers as a lower hierarchy controller utilize a flywheel energy storage unit control method to control a grid power conversion circuit, a flywheel motor power conversion circuit and a permanent magnetic synchronous motor to absorb or emit the power to the alternative current grid according to power instructions obtained by the unit controllers.

Description

technical field [0001] The invention relates to a high-power flywheel array energy storage system oriented to an AC power grid or a distributed micro-grid. Background technique [0002] Flywheel energy storage is an energy storage technology that stores electrical energy in the form of mechanical energy in a high-speed rotating flywheel rotor. It is generally composed of a flywheel rotor, a supporting bearing, a motor, a protective casing, and a power conversion circuit. According to the working speed of the flywheel rotor, it can be divided into high-speed flywheel energy storage system and low-speed flywheel energy storage system. The former uses composite material rotor and magnetic suspension bearing, and the working speed is tens of thousands of rpm; the latter uses metal material rotor and mechanical bearing. , The working speed is generally several thousand rpm. According to relevant data in the field of flywheel energy storage technology at home and abroad, the rate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/30
CPCY02E60/16
Inventor 周龙唐西胜刘文军齐智平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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