PEAK POWER BIDIRECTIONAL TRANSFER FROM HIGH-SPEED FLYWHEEL TO ELECTRICAL REGULATED BUS VOLTAGE SYSTEM - A PRACTICAL PROPOSAL FOR VEHICULAR TECHNOLOGY

This paper provides a design outline and implementation procedure for a Secondary Energy Storage Unit (SESU) that can be used to meet the pe ak energy requirements of an electric vehicle during both acceleration and regenerative braking. The life cycle of the electric vehicle's ba tteries can be extended considerably by supplying peak energy requirem ents from a secondary source. A simulation study was conducted to dete rmine the peak power and energy requirements over the SAE recommended electric vehicle test procedure. A scaled prototype SESU was built usi ng flywheel energy storage, and tests were performed to determine the energy transfer capabilities of a flywheel coupled high speed permanen t magnet synchronous machine through the proposed system's energy stor age tank Results are presented that indicate the necessity of the ener gy storage tank An evaluation of the proposed system is also included which indicates the practicality of the system when compared to conven tional regenerative control techniques.