Unbalanced PWM converter analysis and corrective measures

Author

Enjeti, Prasad N. ; Ziogas, Phoivos D. ; Ehsani, Mehrdad

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

fYear

1989

fDate

1-5 Oct. 1989

Firstpage

861

Abstract

The analysis of an unbalanced PWM AC-to-DC converter by the transfer function approach is presented. The proposed analysis procedure provides for closed-form assessment of all harmonics generated under unbalanced operating conditions by suitably decomposing the converter transfer function into positive and negative sequence components. A three-phase converter operating with programmed PWM patterns is fully analyzed. The distortion at the output of the PWM converter is evaluated under unbalance. The increase in distortion under unbalance is attributed primarily to the appearance of a second-harmonic component. An algorithm for selectively cancelling the generated second-harmonic component at the converter output under unbalance is presented. Suitable implementation techniques for the proposed algorithm are also discussed.<>

Keywords

harmonics; power convertors; pulse width modulation; transfer functions; algorithm; distortion; harmonics; power converters; sequence components; three-phase; transfer function; unbalanced PWM AC-to-DC converter; DC-DC power converters; Harmonic distortion; Pattern analysis; Power harmonic filters; Power system harmonics; Pulse power systems; Pulse width modulation; Pulse width modulation converters; Transfer functions; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE

Conference_Location

San Diego, CA, USA

Type

conf

DOI

10.1109/IAS.1989.96745

Filename

96745