Flywheel energy storage system

Abstract

The invention discloses a flywheel energy storage system. The flywheel energy storage system comprises: a flywheel energy storage device; a bearing controller; a power electronic inverter; a flywheel / motor controller; a load; Between the motor and the motor, the circuit breaker is also electrically connected to the bearing controller. When the magnetic bearing is working normally, the circuit breaker is disconnected. When the magnetic bearing fails or the bearing controller fails, the circuit breaker is automatically closed. Thus, the load is directly connected to the motor through the breaker. When the magnetic bearing fails or the bearing controller fails, the breaker is closed, the motor is electrically connected to the load, and the motor will automatically decelerate quickly, thereby reducing the flywheel from falling to the standby position. Rotation time on the bearing, thereby improving the service life of the spare bearing, which can avoid the damage or failure of other structures from affecting the electrical connection between the load and the motor, and can improve the stability and reliability of the load and reduce the motor speed, so that it can be reliably Increase the service life of spare bearings.

Description

technical field [0001] The invention relates to the technical field of flywheel energy storage, in particular to a flywheel energy storage system. Background technique [0002] The active control magnetic suspension bearing system is widely used in international and domestic high-end flywheel systems due to its low loss, high shafting surface speed, high reliability, long life and low maintenance. Among them, the active control magnetic suspension bearing system passes The magnetic bearing supports the flywheel in the flywheel system, but since the magnetic bearing itself needs to be stabilized by the control ring, when the bearing itself has a system failure, such as system power failure, bearing controller burnout, and controller overload under external disturbances (such as earthquakes) And so on, the magnetic bearing will not be able to provide effective support for the flywheel shafting. [0003] Therefore, the active control magnetic suspension bearing system applied ...

AI Technical Summary

Problems solved by technology

[0006] However, since other components such as power electronic inverters, UPS backup power supplies, and PCS energy storage converters are connected between the motor and the external load, when these components are damaged or fail, the external load will not be electrically connected to the motor. Or when the external load is lost, the speed of the motor will not be reduced, which will make the flywheel speed reduction less reliable, so that the theoretical life of the backup bearing cannot be guaranteed

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