<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This paper presents a pulse doubling technique in a 12-pulse ac-dc converter which supplies direct torque controlled motor drives (DTCIMDs) in order to have better power quality conditions at the point of common coupling. The proposed technique increases the number of rectification pulses without significant changes in the installations and yields in harmonic reduction in both ac and dc sides. The 12-pulse rectified output voltage is accomplished via two paralleled six-pulse acdc converters each of them consisting of three-phase diode bridge rectifiers. An autotransformer is designed to supply the rectifiers. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. Independent operation of paralleled diode-bridge rectifiers, i.e. dc-ripple re-injection methodology, requires a Zero Sequence Blocking Transformer (ZSBT). Finally, a tapped interphase reactor is connected at the output of ZSBT to double the pulse numbers of output voltage up to 24 pulses. The aforementioned structure improves power quality criteria at ac mains and makes them consistent with the IEEE-519 standard requirements for varying loads. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse, 12-pulse, and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 5% for the proposed topology at various loads.</p></abstract>

This paper presents a pulse doubling technique in a 12-pulse ac-dc converter which supplies direct torque controlled motor drives (DTCIMDs) in order to have better power quality conditions at the point of common coupling. The proposed technique increases the number of rectification pulses without significant changes in the installations and yields in harmonic reduction in both ac and dc sides. The 12-pulse rectified output voltage is accomplished via two paralleled six-pulse acdc converters each of them consisting of three-phase diode bridge rectifiers. An autotransformer is designed to supply the rectifiers. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. Independent operation of paralleled diode-bridge rectifiers, i.e. dc-ripple re-injection methodology, requires a Zero Sequence Blocking Transformer (ZSBT). Finally, a tapped interphase reactor is connected at the output of ZSBT to double the pulse numbers of output voltage up to 24 pulses. The aforementioned structure improves power quality criteria at ac mains and makes them consistent with the IEEE-519 standard requirements for varying loads. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse, 12-pulse, and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 5% for the proposed topology at various loads.

Pulse doubling in zigzag–connected autotransformer–based 12–pulse ac–dc converter for power quality improvement

Department of Electrical Engineering, Shahab-e-Danesh Institute of Higher Education, Qom, Iran

Journal of Electrical Engineering

This paper presents a pulse doubling technique in a 12-pulse ac-dc converter which supplies direct torque controlled motor drives (DTCIMDs) in order to have...

Pulse doubling in zigzag–connected autotransformer–based 12–pulse ac–dc converter for power quality improvement

Published Online: Dec 29, 2012

Page range: 357 - 364

DOI: https://doi.org/10.2478/v10187-012-0053-3

Keywords
AC-DC converter, zigzag autotransformer, power quality, 24 pulse rectifier, direct torque controlled induction motor drive (DTCIMD)

This content is open access.

Pulse doubling in zigzag–connected autotransformer–based 12–pulse ac–dc converter for power quality improvement

Published Online: Dec 29, 2012

Page range: 357 - 364

DOI: https://doi.org/10.2478/v10187-012-0053-3

KeywordsAC-DC converter, zigzag autotransformer, power quality, 24 pulse rectifier, direct torque controlled induction motor drive (DTCIMD)

This content is open access.

Keywords
AC-DC converter, zigzag autotransformer, power quality, 24 pulse rectifier, direct torque controlled induction motor drive (DTCIMD)