(1) The normal operation of the UPS system as an active filter not only eliminates the harmful harmonics created by nonlinear loads but also realizes a high efficiency UPS system.
(2) The use of a high speed flywheel with an induction motor/generator for the energy storage realizes high efficiency, maintenance free and long life as three times of battery UPS's.
(3) A half-bridge inverter is utilized to deliver clean power to the loads during power outages, or to suppress the harmonics trom the line current in normal operation. A V-connected three phase inverter is employed to drive the induction motor/generator. The use of the simple inverter circuits enables to assemble the power conversion circuit with a module containing 6 switching devices, and thus contributes to the reduction in the cost and weight.
Both the UPS and active filter functions are demonstrated, and excellent performances are achieved of 99.7% input power factor and 93.1 % efficiency in active filter operation, and 2.8% output voltage distortion in UPS operation.
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