Contribuição ao estudo do acionamento do motor de indução alimentado por inversor de corrente.

Abstract

The steady state analysis, the control system desian, the dynamic performance, and the two different simulations of the auto-sequential current source inverter fed induction motor drive are investigated in this work. The steady-state analysis considering the process of commutation is analysed by four different mathematical models. The waveforms of the drive in steady-state are synthesized by all four models. A simplified model (Fourth model) for the steady-state analysis of the drive is proposed which is considered advantageous over the other models. A systematic design procedure for the design of the complete inverter is presented. The complete dynamic model of the slip frequency controlled current source inverter fed inducton motor drive with frequency compensation is presented. The parameters of the current and the speed controllers are selected based on the ITAE criteria and pole-zero cancellation. The dynamic behavior of the drive is analysed by examining the poles and the zeros of the desired transfer functions of the drive. A simplified simulation of the drive based on the fundamental frequency components, neglecting the delay of the rectifier and the inverter, etc. is developed. Another detailed simulation taking into account a resistive-capacitive model of the inverter, the current harmonics, the delay of the rectifier and the inverter, etc. is developed. Both the simulations are executed on the computer v/ith interconnected blocks by a pre-determined computation strategy simulating the real operation of the drive. The results of both the simulations are used to validate the results of the steadystate analysis, the dynamics and control of the drive.