Contemporary flywheel energy storage systems, or FES systems, are frequently found in high-technology applications. Such systems rely on advanced high-strength materials as flywheels usually operate at speeds exceeding 10,000 rpm.
Research and development of new flywheel composite materials: The material strength of the flywheel rotor greatly limits the energy density and conversion efficiency of the energy storage system, and higher energy storage density can be obtained by using new composite materials with higher strength.
Calculations for a Magnetically Levitated Energy Storage System (MLES) are performed that compare a single large scale MLES with a current state of the art flywheel energy storage system in order to show the relative differences and advantages of such a system.
Overall the flywheel geometry and speed determines the energy storage capability, whilst the motor/generator and power electronics determines the power capabilities.
This paper has presented a new algorithm for regulating the charge and discharge modes of a high speed (60,000 rpm) flywheel energy storage system using a sensorless field orientation control algorithm to provide the inner loop torque control.
Currently a Professor of Energy Systems at City University of London and Royal Acad-emy of Engineering Enterprise Fellow, he is researching low-cost, sustainable flywheel energy storage technology and associated energy technologies.
When energy is extracted from the system, the flywheel''s rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the flywheel.
Abstract: Wide speed range operation in discharge mode is essential for ensuring discharge depth and energy storage capacity of a flywheel energy storage system (FESS).
Once the relationship between the energy storage and strength limitations of flywheel materials in one dimension has been visualized, it is a simple matter to extend this vision to two dimensional flywheels as shown in Figure 2.
