Husan ALI, Muhammad SAAD, Xiaobin ZHANG, Shahbaz KHAN, Bakht Muhammad KHAN, Haider ZAMAN

Average modeling and evaluation of 18-pulse autotransformer rectifier unit without interphase transformers

This paper presents an improved average model and evaluation of an 18-pulse autotransformer rectifier unit(ATRU) in differential delta configuration. Average models remove the switching behavior of diode rectifiers and highbandwidth transients, which not only facilitates simulation of power systems by reducing computational cost but alsoenables impedance-based stability analysis for large complex power systems. To experimentally validate the proposedaverage model, a 2-kW, 18-pulse ATRU has been tested and the results of the derived model are compared with thoseof the switching model and experimental prototype. Computed transfer function of load impedance from the proposedaverage model closely resembles those of the switching model and the experimentally measured results validate themodeling procedure. Furthermore, stability analysis of the 18-pulse ATRU may be executed based on the return ratioof source and load impedance

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