Advanced Control for Induction Motor Drives

The Induction Motor (IM) is very widely used because it is inexpensive and robust, finding use in everything from industrial applications to home applications. Controlling the speed of an IM is far more difficult than controlling the speed of a DC motor since there is no linear relationship between the motor current and the resulting torque as there is for a DC motor. The technique called vector control is used to vary the speed of an induction motor over a wide range. In the vector control scheme, a complex current is synthesised from two quadrature components, one of which is responsible for the flux level in the motor, and another which controls the torque production in the motor. Vector control technology is regarded as a major control method for high performance induction motor speed control systems. According to the basic principles of induction motor vector control, this paper constructs a simulation model of an indirect field oriented vector control system based on the Matlab Software. Vector control offers a number of benefits including speed control over a wide range, precise speed regulation, fast dynamic response, and operation above base speed. The simulation results demonstrate that the model is correct, reasonable and effective. Also the results show that it has good dynamic and static performance, and it realizes the decoupling control system. It can help us better design and debug the motor control system.