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Technical and economical comparison of different autotransformer based 36 pulse AC-DC Converters

Abdollahi Rohollah

Journal of Power Technologies

2019

Vol. 99, nr 4

281--288

Three-phase multipulse ac–dc converters (MPC) are being developed to improve power quality to reduce harmonics in ac mains and ripples in dc output. This study, based on technical and economic factors, compares different autotransformer based 36 pulse AC-DC Converters. This paper presents a comparison of tapped delta, polygon and T connected autotransformer based 36-pulse AC-DC converters. These converters were implemented and simulations were made using Matlab/Simulink software for similar ratings under different load conditions. A set of power quality indices on input ac mains and on a dc bus for a DTCIMD fed from different 36-pulse ac-dc converters is given to compare their performance. The economic comparison of 36 pulse ac–dc converters is based on the apparent power (kVA) ratings of the different autotransformers for 36 pulse AC-DC converters. Also, a prototype is developed and the experimental measurements obtained are presented to validate the feasibility and operability of the 36-pulse AC-DC converter. The 36-pulse AC-DC converter offers a total harmonic distortion of 4% and can operate at near-unity power factor, in compliance with IEEE and IEC standards.

Przetwornica przepustowa AC/DC 200 W z diodami Schottky'ego SiC

Gryglewski D., Wojtasiak W. W., Hrehoruk B.

Elektronika : konstrukcje, technologie, zastosowania

2008

Vol. 49, nr 11

151-154

W artykule opisano konstrukcję wysokosprawnej przetwornicy AC/DC o mocy 200 W i napięciu wyjściowym 50 V z diodami Schottky'ego z węglika krzemu. Układ zaprojektowano w celu zweryfikowania danych zawartych w materiałach reklamowych firmy CREE dotyczących zmniejszenia strat podczas przełączania dzięki zastosowaniu diod SiC. Zaprezentowano wyniki pomiarów sprawności przetwornicy AC/DC z diodami SiC firmy CREE, jak również z popularnymi szybkimi diodami PN.

The high efficiency AC/DC 200 W converter with Schottky SiC diodes (CREE) with 50 V output voltage has been designed. The converter has been made to examine the CREE's advertisement thesis about improving losses in switching SiC diodes. The measured efficiency of the AC/DC converter with SiC CREE diodes and common use fast switching Si PN diodes was presented.