Flywheel energy storage and conversion system with homopolar electromagnetic transmission (HET)

Abstract

The invention provides an energy storage and conversion system which is applied to fixed fields such as load regulation in power grid, widn power generation and the like. Flywheel energy storage is adopted, a routine synchronous or asynchronous motor / generator is connected with a power grid, and homopolar electromagnetic transmission (HET) is adopted as stepless speed change torque change transmission equipment between a flywheel and a motor. The better scheme of the flywheel is to adopt a vertical type flexible flywheel structure or a suspension type flexible flywheel structure, and the suspension type flexible flywheel structure is especially suitable for the flywheel of large mass. The suspension type flexible flywheel structure can solve the unbalance and resonance problem when a rotor is simply supported by combination of a flywheel body and a rotating shaft as usual. An axial support permanent magnet bearing on a vertical type rotating shaft can solve the gravity support problem of the large-mass flywheel. A flexible connection multi-body flywheel body of the flywheel facilitates manufacturing and improvement of energy storage volume density. An energy input / output conversion system composed of the HET and a common motor solves the problem that a motor is large in calorific power and poor in heat radiation, cannot be limited in the aspect of transmission power, and is high in equipment power density, low in cost and high in energy conversion efficiency.

Description

Technical field

[0001] The invention relates to an energy storage and conversion system, in particular to a system that utilizes a flywheel to store energy in a fixed location and converts energy input and output with a power grid. Background technique

[0002] The flywheel energy storage and conversion system is mainly composed of two parts: the flywheel energy storage device and the energy conversion system. The current typical flywheel energy storage and conversion system has the following structures and characteristics:

[0003] Kinetic energy carrier of the flywheel: the kinetic energy of the flywheel comes from the fact that the larger mass of the flywheel rotates at a high linear speed. energy storage density. The circumferential (longitudinal) strength of this material structure is the highest, but the radial and axial (transverse) strength of the material structure is very low, so that the wheel body mass block can only be made with a thinner radial thickness. Th...

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