High Power Density Adjustable Speed Drive Topology with Medium Frequency Transformer Isolation
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© 2015 IEEE. This paper presents a new adjustable speed drive (ASD) topology that employs medium frequency (MF) transformer isolation. The proposed system consists of a new 3-phase push-pull based AC to DC rectifier with a MF AC link employing only two active switches. A single 5-limb multi-winding MF transformer is employed for isolation. The secondary side of the transformer is connected in a zig-zag configuration and is fed to 3-phase diode rectifiers, realizing 12-pulse rectifier operation. The advantages of the proposed system include high power density due to MF transformer isolation, low active switch count, and a simple modulation scheme. Furthermore, zig-zag transformer connection helps to balance leakage inductance on the secondary side. A 690 VLL, 100 HP design example, detailed analysis and extended simulation results are presented to validate the performance of the proposed approach.
author list (cited authors)
Sandoval, J. J., Krishnamoorthy, H., Enjeti, P., & Choi, S.