Fuzzy PID Control Compensation System for Speed of VVVF Induction Motor Drive

Abstract

I. INTRODUCTIONThe induction motor is the electric motor type most used industry. The certain excellent features of the induction motor such as for the user this low cost and high reliability, good efficiency and low maintenance. The induction motors are asynchronous induction machines whose speed depends upon applied frequency, pole pair number, and load torque. This market need and growing at a healthy rate as users of operating motors at variable speeds [1].The core of algorithm traditional control for induction motor drives were PI/PID control. That the simple structure and stable performance. But it is difficult to meet the high precision and fast response [2]. The Fuzzy Logic Control novel design applied for the speed of an induction motor [1], [3], [4]- [6].The fuzzy two-degree of freedom to obtain good tracking and regulating response [7]. An advantage of traditional controlled that can be easily modified into the conventional controller structure by adding a compensator [8], [9]. In addition, that the two-layered control structure is robust to variations, as well as the steady-state gain of the plant [10]. Unfortunately, in the real control application, a global model is very difficult to build, and even when a model is available, complex conditions are obtained.The nonlinear system can be controlled if the dynamic model was established [11].Induction motor is a complex system, the control techniques such as PI, PID or Fuzzy controllers with auto-tuning function can be applied for driving [12], [13]. The compensation control system minimized torque ripple, reaches the reference speed rapidly and without overshoot [11], [14].The remainder of this paper is the further verification concept of high application in system drive. To find the Fuzzy PID control compensation performance of this system, the three phase induction motor with variable voltage-variable frequency technique (VVVF) is implemented. The computer control experimental was setup two-degree of freedom are chosen for rule base to compensating signal is added to PID by using LabVIEW. The simulation and real time control results are illustrated and compared. II. INDUCTION MOTOR DRIVE A. Variable-Voltage Variable-Frequency (VVVF) Induction Motor DriveSome problem in the operation of induction motor this open-loop control are the following: the speed cannot be controlled precisely, the slip speed cannot be maintained [12]. These problems are to an extent overcome by having outer speed loop in the induction motor drive. The actual rotor speed ( ) is compare with its command value( * )and the error is processed a controller usually a PI/PID. The slip-speed command is added to electrical rotor speed to obtain the stator frequency command. Thereafter, the stator frequency command is processed as in driven unit. is the maximum control voltage(+ 5 or +10V) * is the command speed of the motor The proportionality constant is defined as * = * * = * volt/(rad/sec)The gain of tachogenerator is defined asis the gain of the frequency transfer. * is the commande...

Fuzzy Tuning PID Control of the Rolling Mill Main Drive System

“…However, the tuning parameters of conventional PID controller are often difficult to achieve optimal state. It is difficult to meet the high precision and fast response [1].…”