Matlab Simulation of Induction Motor Drive using V/f Control Method

there are several types of method available to control Induction motor in industries. To observe the steady state equivalent circuit model of an induction motor to implant the equation that aver the use of a constant V/f speed control of close loop and open loop control. The main purpose is to sustain the speed at fixed reference. Six step voltage source inverter (VSI) used to drive motor in open loop control. In this paper, six step generator generated variable frequency signals which fed to motor. Here, constant V/f ratio is maintained in order to get torque constant over the full operating range. To scrutinize the open loop control systems for supervisory induction machine, several outcome obtained at altered V/f ratio. By modification in V/f ratio in open loop approach speed ruling of three phase induction motor drive can be upgraded. For more enhancement in speed regulation, slip regulation is used in closed loop speed control. The slip is supplementary to the response speed signal to the frequency command. Various outcome are gained when modification in V/f ratio in close loop method. The work of this paper is to study, evaluation and comparison of Various V/f control technique applied to the induction motor drive through simulations. Simulation result shows that if open loop configuration, the effect of change in V/f ratio improves speed regulation and there is no remarkable effect in closed loop configuration. Open loop V/f control technique is simple and easy to implement. However if closed loop V/f control technique is adopted there is no change the V/f ratio as it not helps to obtain better result.