• Document: F Scalar Vector Controllers
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International Journal of Computer Applications (0975 – 8887) Volume 151 – No.7, October 2016 Speed Control of Induction Motor using PI and V/F Scalar Vector Controllers Hanan Mikhael D. Habbi Hussein Jalil Ajeel Inaam Ibrahim Ali Electrical engineering Electrical engineering Electrical engineering department department department University of Baghdad University of Technology University of Technology ABSTRACT major types: scalar control, vector control methods. Scalar In this paper, Induction Motors (IM) are widely used in the control or as it is called V/F control. The structure is very industrial application due to a high power/weight ratio, high simple and it is normally used without speed feedback. reliability and low cost. A Space Vector PWM (SVPWM) is However, this controller doesn’t achieve a good accuracy in utilized for PWM controlling scheme. The performance of both speed and torque responses, mainly due to the fact that both the speed and torque is promoted by a modified PI the stator flux and the torque are not directly controlled [3]. controller and V/F scalar control. A scalar control is a simple The main objective of this control method is, as in separately method and it's operated to control the magnitude of the exited DC machines, to independently control the torque and control quantities in constant speed application. V/F scalar flux; this is done by choosing a d-q rotating reference frame control has been implemented and compared with the PI synchronously with the rotor flux space vector [4]. A voltage controller. The simulation results showed that Indirect Field source inverter (VSI) should have a stiff voltage source at the oriented control (IFOC) induction motor drive employ input, that is, its Thevenin impedance should ideally be zero. decoupling of the stator current components which produces Thus, a large capacitor can be connected at the input if the torque and flux. The complete mathematical model of the voltage source is not stiff. (VSI) consist of power bridge system is described and simulated in MATLAB/SIMULINK. devices with three output legs, each consisting of two power The simulation results provides a smooth speed response and switches and two freewheeling diodes, the inverter is supplied high performance under various dynamic operations. from DC voltage source (either battery or diode-based bridge rectifier) via LC or C filter [5]. The Space Vector Pulse Width Keywords Modulation (SVPWM) method is an advanced, computation- Induction motor, SVPWM, PI-Controller, V/F intensive PWM method and possibly the best among all the PWM techniques for variable frequency drive application. It ABBREVIATIONS exhibits the feature of good dc-bus voltage utilization and , : the d and q axis components of the stator current Low total harmonic distortion (THD) compared to other PWM methods. SVPWM is more suitable for digital q : the d and q axis component of the rotor current implementation and can increase the obtainable maximum ℷ ,ℷ : the d and q axis components of the stator fluxes output voltage with maximum line voltage approaching 70.7% ℷ ,ℷ : the d and q axis components of the rotor fluxes of the DC link voltage in the linear modulation range [6]. , : the d and q axis components of the stator voltage. SVPWM is adopted in this paper for PWM controlling scheme. In addition, a comparative study of the speed control s, R : the stator and rotor resistances. of induction motor using V/F scalar vector and PI controllers r: the rotor speed is illustrated. The induction motor drive can be controlled to P: the number of pole pairs

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