29-07-2011, 04:10 PM
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A Novel Three-Phase to Five-PhaseTransformation Using a Special Transformer Connection
ABSTRACT
this paper proposes a novel transformer connection scheme to convert the three-phase grid supply to a five-phase fixed voltage and fixed frequency supply.
Bulk power
Speed drive applications
Introduction
inherent advantages
Reduce Complexity
Ward and Harrier way back in 1969 .
Odd number of phases
THREE PHASE
Geometry of transformer
MULTI WINDING TRANSFORMER
WINDING ARRANGEMENT
Star connection
DESIGN OF THE PRAPOSED TRANSFORMER
Circuit diagram
Phasor diagram
waveforms
Characteristics of Five phase induction motor
GENERAL FIVE-PHASE INDUCTION MOTOR THEORY
Advantages
RESEARCH on multiphase induction-motor drives has grown since the beginning of the century, providing features that are suitable for high-power applications.
The five-phase connection eliminates the fifth- and other quintuple-order harmonics.
Applications
The first record of a multiphase motor drive, known to the authors, dates back to 1969, when a five-phase voltage source inverter-fed induction motor drive was proposed.
The main application areas are ship propulsion traction (including electric and hybrid electric vehicles) and the concept of “more-electric” aircraft.
CONCLUSION
This paper proposes a new transformer connection scheme to transform the three-phase grid power to a five-phase output supply. The connection scheme and the phasor diagram along with the turn ratios are illustrated. The successful implementation of the proposed connection scheme is elaborated by using simulation and experimentation. A five-phase induction motor under a loaded condition is used to prove the viability of the transformation system. It is expected that the proposed connection scheme can be used in drives applications and may also be further explored to be utilized in multiphase power transmission systems.
