DTC-SVM Approaches of an Induction Motor Dedicated to Position Control Applications

Abstract

The chapter is devoted to the DTC and DTC-SVM position control approaches of induction motor (IM) allowing the movement of a photovoltaic panel according to the maximum sunshine position to extract a high efficiency of the system. The DTC is selected to full the application requirements, especially a maximum torque at standstill. This feature is necessary in order to guarantee a high degree of robustness of the maximum sunshine position tracking system against the high and sudden load torque variations characterized by the gusts of wind. The first step is devoted to a comparison study between three DTC strategies, dedicated to position control, such that: the basic DTC strategy, the DTC strategy with a look-up table including only active voltage vectors, and the DTC-SVM strategy with hysteresis controllers. Furthermore, the synthesis and the implementation of DTC-SVM approaches based on position control are treated. Within this context, the final part of the chapter proposes a comparison between three DTC-SVM approaches: (i) a DTC-SVM approach using PI controllers, (ii) a DTC-SVM approach using PI controllers with a nonlinear compensator, and (iii) a DTC-SVM approach using sliding mode controllers. In that case, an adaptation approach of parameter estimators are implemented in order to eliminate the effects of parameter variations and load disturbances. Simulations results show that the SM DTC-SVM approach gives the best results.

Low-Cost DTC Drive Using Four-Switch Inverter for Low Power Ranges

“…At very low speeds, the voltage drop across the stator winding constitutes a considerable part of the stator voltage [13][14][15][16]. Therefore, it cannot be ignored, especially if the machine is heavily loaded (fully loaded).…”

“…Motor transient model to compute the stator flux vector and electromagnetic torque; • Dual hysteresis on/off controllers: one for the flux and the other for the torque; • Optimum switching table whose output is the instantaneous values of the inverter switching state [13][14][15][16].…”