Direct torque control with imposed switching frequency and torque ripple minimization in an 11-level cascaded inverter

Author

Rodríguez, J. ; Pontt, J. ; Kouro, S. ; Correa, P.

Author_Institution

Electron. Eng. Dept., Univ. Tecnica Federico Santa Maria, Valparaiso, Chile

Volume

2

fYear

2003

fDate

15-19 June 2003

Firstpage

501

Abstract

This paper presents the application of direct torque control in an induction motor, using a multilevel cascaded inverter with separated DC sources. The control strategy operates with imposed switching frequency, improving torque behavior. The paper studies the theoretical concepts related to this method, like vector selection, state variables estimation and commutation time calculation. In addition, this work presents results for a 3 and 11-level inverter fed drive, from which it can be appreciated that the increase of levels of the load voltage reduces the torque ripple.

Keywords

commutation; induction motor drives; invertors; machine control; parameter estimation; switching convertors; torque control; 11-level cascaded inverter; 11-level inverter fed drive; 3-level inverter fed drive; commutation time calculation; control strategy; direct torque control; load voltage; multilevel cascaded inverter; separated DC sources; state variables estimation; switching frequency; torque ripple minimization; torque ripple reduction; vector selection; Capacitors; Circuit topology; Hysteresis; Induction generators; Pulse inverters; Pulse width modulation inverters; Switches; Switching frequency; Torque control; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialist Conference, 2003. PESC '03. 2003 IEEE 34th Annual

ISSN

0275-9306

Print_ISBN

0-7803-7754-0

Type

conf

DOI

10.1109/PESC.2003.1218106

Filename

1218106