George S Fernandez


In the conventional method, vector control of the asynchronous machine is to make an analogy of it, equivalent to a separately excited DC machine. It offers a decoupled control of torque and flux which is perpendicular to each other hence one vector is not interfered by other. So, torque and speed control is achieved in an isolated manner even though they are closely interlinked. This is implemented by aligning the rotor flux with the direct axis of the synchronously rotating reference frame. PI controllers play a key role to achieve the desired topology of the VFD. Three controllers are used in the system, flux, speed and torque controller. Tuning of flux controller is quite simple, but in case of speed and torque, it became quite tricky because the output of the speed controller is the reference signal of torque controller. Moreover, there is no distinct method to tune the controllers in the vector control system. Still, the entire high-performance dynamic response of the machine depends on the perfect tuning of those controllers. From the above analysis, it is understood that system identification is essential to tune the PI controllers. But being an asynchronous machine, to obtain system transfer function in a decoupled manner is very difficult. To overcome this problem, the proposed model will be Conventional sine PWM modulated switching pulses are used to implement variable frequency drives for induction motor. Space vector modulated PWM switching pulse is used to fire IGBT. In the case of sine, PWM modulated switching; DC bus voltage utilization is 50% whereas in space vector modulated inverter 57.73% DC Bus voltage utilization can be achieved. Even though in low voltage application, it may not contribute significantly but in case of medium voltage application, it contributes meaningfully. At mega 2560 micro-controller is used to generate the switching pulses using the timers with phase correct PWM mode to provide a dead time of the complementary switchers of each phase. The high-performance dynamic response of the machine is depended on the perfect tuning of the three PI regulators. For anti-windup and overshoot, free tuning requires lower order, simplified and decoupled transfer function for its small-signal model and its linearization. It this paper, higher-order transfer functions are reduced to the first-order system, made decoupled and tuned ideally using Simulink toolbox. Space vector modulated scalar control of induction motor technique is preferred, which eliminates the complexity of PI tuning.


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DOI: http://doi.org/10.11591/ijeecs.v20.i3.pp%25p
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