Sistema de acionamento digital para máquina assíncrona utilizando estratégias de controle mono e multivariáveis sem sensor de velocidade.

Abstract

This work is about high performance drive system using asynchronous machines with and without mechanical speed sensor. Initially i t is been about of the state estimation for the feedback control. It is proposed the implementation of an complete order observer in closed-loop with off-line discretization. The proposal and analyzed control strategies they are divided in mono and multivariable control. Based on this division a bibliographical revision it is presented. Inserted in the group of the monovariable strategies two strategies classified in agreement with the control variables in slip and quadrature control are proposed. For the multivariable control are presented linear control strategies with feedback states. These strategies are also divided in agreement with the control variables. The gains of the multivariable controller are calculated using pole placement or then optimal control with Linear Quadratic Regulator (LQR). To conclude three control strategies they are presented without mechanical speed sensor. Two of then use monovariable controllers (with indirect field orientation and flux and torque direct control) and the third use multivariable control with states feedback using stator flux as control variable. Results os simulations and experimental they are presented.