Compensation of fluctuating DC link voltage for traction inverter drive

Author

Salam, Z. ; Goodman, C.J.

Author_Institution

Birmingham Univ., UK

fYear

1996

fDate

23-25 Sept. 1996

Firstpage

390

Lastpage

395

Abstract

In this paper, the behaviour of an inverter-induction motor drive system fed by a fluctuating DC link voltage is studied. The modulation process between the quasi-square wave switching function and the fluctuating DC link voltage generates beat voltages which produces large beat currents when the difference frequency approaches zero. This gives rise to serious problems for the motor; namely torque pulsation and motor heating. Compensation methods to suppress the low frequency beat current are discussed. A new compensation method based on volt-second equalisation is proposed and simulated.

Keywords

DC-AC power convertors; compensation; control system synthesis; harmonic distortion; induction motor drives; invertors; machine control; power system harmonics; traction motor drives; beat currents; beat voltages; control design; difference frequency; fluctuating DC link voltage compensation; harmonic spectra; inverter; modulation process; motor heating; quasi-square wave switching function; torque pulsation; traction induction motor drive; volt-second equalisation;

fLanguage

English

Publisher

iet

Conference_Titel

Power Electronics and Variable Speed Drives, 1996. Sixth International Conference on (Conf. Publ. No. 429)

ISSN

0537-9989

Print_ISBN

0-85296-665-2

Type

conf

DOI

10.1049/cp:19960946

Filename

708387