Analysis of waveform approximation for the AC current of a line-commutated converter

Author

Daryabak, M. ; Filizadeh, Shaahin

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Manitoba, Winnipeg, MB, Canada

fYear

2013

fDate

2-4 Oct. 2013

Firstpage

1

Lastpage

5

Abstract

This paper analyzes mathematical approximations of the ac current of a line-commutated converter (LCC), which is the building block of conventional HVDC systems. The paper derives analytical expressions for the ac current of an LCC during the commutation and non-commutation periods and continues with calculating the percentage error of both the fundamental frequency component of the ac current and the power factor of the converter when the ac current is approximated with either a square or a trapezoidal waveform. The results quantitatively show the benefit of the trapezoidal waveform approximation in terms of its percentage error and simplicity.

Keywords

HVDC power convertors; HVDC power transmission; waveform analysis; HVDC systems; LCC; ac current; commutation periods; fundamental frequency component; high-voltage direct current transmission systems; line-commutated converter; mathematical approximations; noncommutation periods; percentage error; square waveform approximation; trapezoidal waveform approximation; Approximation methods; Reactive power; Error analysis; Line commutated converter (LCC); fundamental frequency component; power factor;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Power and Energy Conversion Systems (EPECS), 2013 3rd International Conference on

Conference_Location

Istanbul

Print_ISBN

978-1-4799-0687-1

Type

conf

DOI

10.1109/EPECS.2013.6713068

Filename

6713068