A current source PWM inverter with instantaneous current control capability [AC motors]

Author

Enjeti, Prasad N. ; Ziogas, Phoivos D. ; Lindsay, James F.

Author_Institution

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

fYear

1988

fDate

2-7 Oct. 1988

Firstpage

927

Abstract

A novel approach for the control of a current-source PWM (pulsewidth-modulated) inverter is proposed to achieve instantaneous current control capability. The scheme provides instantaneous current response in the AC motor by altering the modulation index of the current-source PWM patterns. To achieve this task, optimum programmed PWM patterns with selective elimination of lower-order harmonics in the motor line currents are used. Output filter capacitors are provided to bypass the current harmonics in the inverter output and allow for the instantaneous changes in line currents. This method of control provides sinusoidal output voltages and sinusoidal currents in the AC motor. The scheme guarantees fast response characteristics combined with high-performance steady-state behavior. A design procedure for the current-source PWM and selection of programmed PWM current patterns for a variable-speed situation are illustrated. Selected results are verified experimentally.<>

Keywords

AC motors; electric current control; invertors; pulse width modulation; AC motor; current source PWM inverter; filter capacitors; instantaneous current control; response characteristics; sinusoidal currents; sinusoidal output voltages; steady-state behavior; AC motors; Capacitors; Current control; Power harmonic filters; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Steady-state; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1988., Conference Record of the 1988 IEEE

Conference_Location

Pittsburgh, PA, USA

Type

conf

DOI

10.1109/IAS.1988.25171

Filename

25171