Title :
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
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;
Conference_Titel :
Industry Applications Society Annual Meeting, 1988., Conference Record of the 1988 IEEE
Conference_Location :
Pittsburgh, PA, USA
DOI :
10.1109/IAS.1988.25171
