Date of Publication :9th March 2018
Abstract: Flywheel battery is a new concept battery for mechanical energy storage. It provides some attractive advantages compared with chemical batteries for electric vehicles, such as power efficiency and high energy, long cycle life and maintenance reduction.This work developed an integrated flywheel battery with an axial-flux motor and generator that integrates rotor with the flywheel.This paper presents a new control method for the energy storage (FBES) device for flywheel batteries. The proposed method adopts a double closed-loop control structure based on an external DC bus voltage loop cascaded with an internal current loop and an additional loop for speed control.It can accomplish the charging and discharge cycle of the flywheel battery by regulating the speed of the flywheel without altering the controlling object of the outer loop.The DC bus voltage is fully determined by the power system during the charge process, and the speed control loop limits the speed of the flywheel to avoid overcharging. Accordingly, the flywheel battery must maintain the stability of the DC bus voltage during the discharge cycle.To complete the simulation of charge and discharge control and the sudden simulation of loading during discharge, an FBES system is created.
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