Three-phase UPS with high power factor and high frequency transformer isolation

This work proposes an double conversion three-phase uninterruptible power system (UPS) with power factor correction, high frequency (HF) transformer isolation, and suitable for operation with line-to-line input voltages equal to 220 V or 380 V. For both input voltages, the proposed converter has alm...

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Bibliographic Details
Main Authors: Bascope, R.P.T., Branco, C.G.C., Cruz, C.M.T., Bezerra, L.D.S., Hertz, G.A.T.
Format: Conference Proceeding
Language:English
Subjects:
Choppers
Frequency conversion
Hafnium
Inverters
Power factor correction
Power generation
Reactive power
Switches
Switching circuits
Uninterruptible power systems
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Description
Summary:This work proposes an double conversion three-phase uninterruptible power system (UPS) with power factor correction, high frequency (HF) transformer isolation, and suitable for operation with line-to-line input voltages equal to 220 V or 380 V. For both input voltages, the proposed converter has almost the same efficiency processing the same output power. The structure is composed by single-phase chopper modules, single-phase boost modules, and one three-phase inverter . The relevant features are soft commutation of the controlled switches in the chopper stage, simple control strategy that can be implemented with well-known integrated circuits (IC), and the use of few batteries in series due to the same reference of the step-up stages. Principle of operation of the proposed system, implemented control strategy and experimental results obtained for a 15 kVA prototype are presented.
ISSN:1553-572X
DOI:10.1109/IECON.2009.5415041