Flywheel energy storage system with electromagnetic coupler

By using electromagnetic couplers and frequency converters in the flywheel energy storage system, the generator output is maintained at a constant frequency, which solves the problem of reduced rotational inertia in the power grid and improves the stability of the power grid and its ability to accept new energy.

CN114257030AActive Publication Date: 2022-03-29STATE POWER INVESTMENT CORPORATION RESEARCH INSTITUTE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE POWER INVESTMENT CORPORATION RESEARCH INSTITUTE
Filing Date
2021-11-16
Publication Date
2022-03-29

AI Technical Summary

Technical Problem

The large-scale use of power electronic devices in the power grid has led to a continuous reduction in the total moment of inertia, which cannot effectively provide voltage and frequency support, increasing the instability of the power grid operation and the pressure to accept new energy.

Method used

A flywheel energy storage system with an electromagnetic coupler is used to keep the output speed of the generator constant through the electromagnetic coupler and frequency converter, providing constant frequency current, avoiding the decoupling, rectification, frequency modulation, and voltage stabilization of power electronic devices, and enhancing the power grid moment of inertia to ensure grid frequency stability.

Benefits of technology

It increases the moment of inertia of the power grid, reduces the risk of frequency deviation, enables the power system to operate safely and stably, and improves the power grid's ability to efficiently accept new energy.

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Abstract

The invention provides a flywheel energy storage system with an electromagnetic coupler, which comprises a motor, a flywheel rotor, the electromagnetic coupler, a frequency converter and a generator, and is characterized in that the motor is connected with the flywheel rotor to drive the flywheel rotor to rotate, the electromagnetic coupler comprises an outer rotor and an inner rotor, and the outer rotor sleeves the inner rotor and is spaced from the inner rotor; the flywheel rotor is in transmission connection with the inner rotor, the inner rotor generates a rotating magnetic field to drive the outer rotor to rotate, and the frequency converter is connected with the outer rotor to change the current frequency of the outer rotor so as to change the magnetic field rotating speed matched with the current, so that the mechanical rotating speed of the outer rotor is kept constant. The generator generates power, accesses the power grid and inputs electric energy with stable frequency into the power grid, the requirement of power transmission to the power grid is met, power electronic devices are not needed, rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, and the capacity of the power grid for efficiently accepting new energy is improved.
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