Motion control of linear induction motor based on optimal recurrent wavelet neural network-PID controller

Abstract

This paper contains a proposed controller based on optimal recurrent wavelet neural network (RWNN) with PID controller to control the velocity and hence the stator current as well as the developed thrust of three phase linear induction motor (LIM) which consider the end effects. A vector control represented by indirect field oriented control (IFOC) technique is appointed to attain velocity and flux control for different loading conditions. Moreover, a voltage source inverter based on space vector pulse width modulation (SVPWM) is utilized to give the required stator voltage of LIM. A well-known particle swarm optimization (PSO) algorithm is employed for online tuning of the proposed controller. The computer simulation results show that this controller is effective and gives preferable and rigorous performance compared with a results obtained from conventional wavelet neural network (WNN) and PID controllers.

Anti‐windup scheme based on 2DOF‐PIλDμcontroller for velocity tracking of linear induction motor

“…The model of the LIM is implemented according to the given mathematical equations (1‐12) as shown in Figure . Table shows the parameter values of LIM . After tuning (using PSO algorithm), the optimal coefficient values of the proposed controller are obtained as shown in Table .…”

“…From the d‐q equivalent circuit, the voltage equations can be described in a synchronous reference system as where the flux linkages of the primary and secondary are expressed as …”

“…The concept of IFOC technique aims at controlling the stator currents by conveying the currents of three phase using the electrical positioning of LIM to get the current of two phase in the d‐q reference structure scheme. This results in separating the flux and the torque variables and then controls the stator direct‐axis current i ds and quadrature‐axis current i qs independently …”

“…The IFOC scheme utilizes the measured velocity of LIM to control the velocity using the controller of velocity, which provides the reference quadrature‐axis current i qs for controller of current that is then compared with the feedback quadrature‐axis current i qs to get the necessary voltage v q for the SVPWM inverter for controlling the torque. While the flux can be controlled using the current controller to control direct‐axis current i ds , by comparing the reference direct‐axis current i ds to the direct‐axis current feedback i ds to obtain the required voltage v d . Within the IFOC, LIM secondary flux linkage axis should be in line together with the d‐axis, and the field orientation conditions can be described as Moreover, Equations and can be combined with Equation to obtain the thrust force equations as Equations and can be combined with Equation to obtain the feed‐forward slip velocity signal as …”

“…In recent years, the developments in the control strategies led to the investigation of several control techniques to control the speed of the motors. One of the control techniques that were used to control the LIM is the FOC technique which is considered as one of the most efficient techniques and provides the similar work as that of separately excited DC machines …”