Analysis of new step-up and step-down 18-pulse direct asymmetric autotransformer-rectifiers

Burgos, Rolando; Uan-Zo-li, A.; Lacaux, F.; Roshan, A.; Wang, F.; Boroyevich, Dushan

doi:10.1109/ias.2005.1518304

Cited by 18 publications

(10 citation statements)

References 20 publications

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“…Scheme B was recently proposed to reduce transformer power capacity [7,8,10] in which the output dc voltage changes every 20˚;…”

Section: Five Practical Schemesmentioning

confidence: 99%

See 1 more Smart Citation

Autotransformer-based 18-pulse rectifiers without using dc-side interphase transformers: Classification and comparison

Oguchi

2008

2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion

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Autotransformer-based 18-pulse rectifier systems are classified from three points of view: (a) dc-side connections of diode bridges, (b) the number of phases of the diode bridge input voltages, and (c) the symmetry of the input voltage systems. Five practical systems are chosen of which system structures, voltage synthesizing methods, equivalent transformer capacities, and simulated current waveforms are presented. The total harmonic distortion of line currents are compared when the supply voltages have pre-existing voltage-unbalance and -distortion resulted from fifth harmonics. Two schemes are recommended for applications required unregulated and regulated dc voltages.

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“…Scheme B was recently proposed to reduce transformer power capacity [7,8,10] in which the output dc voltage changes every 20˚;…”

Section: Five Practical Schemesmentioning

confidence: 99%

“…Moreover, novel topologies [8][9][10][11][12][13] have been reported which are not presented in [1].…”

Section: Introductionmentioning

confidence: 99%

Autotransformer-based 18-pulse rectifiers without using dc-side interphase transformers: Classification and comparison

Oguchi

2008

2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion

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“…However, the new phase shift angle can only increase 1.4144 times the input voltage amplitude. To widen the voltage range of the autotransformer, the method of reshaping the structure is put forward in Burgos et al (2005). However, due to the asymmetry between the output voltage and the input voltage, the leakage inductance between primary and secondary windings will be unequal, which may cause non-characteristic harmonics in input line current.…”

Section: Introductionmentioning

confidence: 99%

Novel symmetrical step-down topologies of zigzag autotransformer

Wang

Chen

2019

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Purpose This paper aims to obtain a symmetrical step-down topology with lower equivalent capacity and wider step-down range under the condition of the same output. Three new symmetrical step-down topologies of zigzag autotransformer are proposed in this paper. Taking the equivalent capacity as the main parameter, the obtained topologies are modeled and analyzed in detail. Design/methodology/approach This paper adopts the research methods of design, modeling, analysis and simulation verification. First, the zigzag autotransformer is redesigned according to the design objective of symmetrical step-down topology. Second, the mathematical model of the designed topology is established, and the detailed theoretical analysis is carried out. Finally, the theoretical results are verified by simulation. Findings Three symmetrical zigzag autotransformer step-down topologies are designed, the winding configurations of the corresponding topology are presented, the step-down ranges of these three topologies are calculated and the influence of step-down ratio on equivalent capacity of autotransformer is analyzed. Through analysis, the target step-down topologies are obtained when the step-down ratio is [0.969, 1.414] and [1.414, 8]. Research limitations/implications Because the selected research object is only zigzag autotransformer, the research results may lack generality. Therefore, researchers are encouraged to further study topologies of other autotransformers. Practical implications This paper includes the implications of step-down ratio on the equivalent capacity of autotransformer and the configuration of transformer windings. Originality/value The topologies designed in this paper enable zigzag autotransformer to be applied in step-down circumstances.

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“…Traditionally, this is achieved by using a four-winding isolation transformer that has one set of primary windings and three sets of secondary windings, which can get a wide range of output voltage, but the main disadvantage of this scheme is that the isolation transformer is large in size and weight [6]. When isolation is not necessary, the 18-pulse rectifier can be fed from T-delta, delta and polygon winding autotransformers, and the three sets of rectifiers can be symmetry or asymmetry, appropriate fork connections could also be employed to provide 18-pulse characteristics [7].…”

Section: Introductionmentioning

confidence: 99%

Research on 18-pulse rectifier based on a boost star-fork connected autotransformer

Liu

Duan

Qiu

2011

2011 International Conference on Electrical Machines and Systems

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An 18-pulse rectifier based on a step-up or stepdown autotransformer in star-fork connection is presented. The voltage vector diagram of the autotransformer is given out and the connection of windings is also analyzed. By arrangement the secondly windings properly, the output voltage can be set in a wide range below or above the 3-phase uncontrolled rectifier with a low THD in the input current. Key analysis and results obtained via the Matlab simulation and some experimental results are presented for validation of the presented work.

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Analysis of new step-up and step-down 18-pulse direct asymmetric autotransformer-rectifiers

Cited by 18 publications

References 20 publications

Autotransformer-based 18-pulse rectifiers without using dc-side interphase transformers: Classification and comparison

Autotransformer-based 18-pulse rectifiers without using dc-side interphase transformers: Classification and comparison

Novel symmetrical step-down topologies of zigzag autotransformer

Research on 18-pulse rectifier based on a boost star-fork connected autotransformer

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