Abstract
Flywheel energy storage can store large amounts of kinetic energy in its rotating parts, but its inertia restricts the rate of power exchange. On the other hand, there is supercapacitor with the ability of exchanging large amounts of instantaneous power. Therefore, the combination of these two systems can significantly improve the dynamic response of conventional flywheel energy storage. This paper proposes a novel design for this combined system in which supercapacitors are located inside the rotating disk. Therefore, supercapacitors can significantly improve the dynamic performance of the flywheel energy storage with trivial effects on its size and weight. Moreover, the ability of rotating supercapacitors to store electrical as well as kinetic energy increases the energy storage capacity of the proposed flywheel energy storage. This developed system with its improved performance can be widely employed instead of the conventional flywheel energy storage in various applications. In this paper, the proposed structures with built-in rotating supercapacitors are mechanically analyzed by CATIA and ABAQUS. In addition, the developed flywheel energy storage, which is equipped with a permanent magnet synchronous machine and its modified indirect vector controller, is simulated in MATLAB/Simulink under various conditions.
Highlights
Today, different energy storages, from very large to very small-scale systems, can be found in various applications [1,2,3]
The ability of exchanging pulsed power as well as storing high amounts of energy can be achieved by the combination of the supercapacitor with the conventional flywheel energy storage
In the proposed flywheel energy storage the supercapacitors are inserted into the rotating disk to improve the dynamic response
Summary
Different energy storages, from very large to very small-scale systems, can be found in various applications [1,2,3]. Electric transportation, which attracts more attention due to the disadvantages of fossil fuels, utilizes energy storage to supply the driving force and save regenerative braking energy [7,8,9]. This stored energy is given back by generator operation of the electrical machine This highly efficient energy storage can exchange considerable amounts of energy over a short time interval in comparison with electrochemical batteries. Merging supercapacitors into the rotating disk significantly reduces the size and weight of the proposed system compared with their stationary combination This makes the proposed system suitable for vehicular applications in which the size as well as weight of the utilized energy storage is a real problem. The proposed disk structures are mechanically analyzed by CATIA and ABAQUS and the proposed flywheel energy storage is simulated from an electrical viewpoint in MATLAB/Simulink under various conditions
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