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High-speed, low-cost flywheels for energy storage in sustainable power systems with distributed generation

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3 Author(s)
Johnson, D. ; Dept. of Electr. Eng., Cape Town Univ., Rondebosch, South Africa ; Malengret, M. ; Pillay, P.

This paper covers the technical aspects of an electromechanical battery. A permanent magnet motor-generator is incorporated in a composite flywheel, running at high speed in a vacuum containment to minimize air friction losses. The flywheel is to be suspended on cascaded, Teflon coated, high-speed roller bearings. A composite flywheel requires a simple containment to sustain the vacuum for the moving parts, since most of the energy is dissipated in the fracture process in case of catastrophic failure. A three-phase, switch mode bridge converter, driven by a bipolar pulse width modulation board, achieves the variable speed control for the flywheel and the control of the DC bus voltage. The target storage capacity is 250 Wh with a power rating of 40 W

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Power Engineering Society Summer Meeting, 2001  (Volume:1 )

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