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|Title:||PERFORMANCE EVALUATION OF ENERGY EFFICIENT CONTROL OF VSI FED INDUCTION MOTOR DRIVE|
|Authors:||J, Durga Prasad|
|Keywords:||ELECTRICAL ENGINEERING;ENERGY EFFICIENT CONTROL;VSI FED INDUCTION MOTOR DRIVE;INDUCTION MOTOR|
|Abstract:||Induction motor is a high efficiency electrical machine when working closed to its rated torque and speed. However, at light loads, no balance in between copper and iron losses, results considerable reduction in the efficiency. The part load efficiency and power factor can be improved by making the motor excitation adjustment in accordance with load and speed. To implement the above goal, the induction motor should either be fed through an inverter or redesigned with optimization algorithms. For energy efficient control of induction motor, flux level in a machine is adjusted to give minimum operating cost for the industrial load. The flux controller improves the economics in terms of operating cost and test results show that the flux level in the most economic motor is adjusted according to load and speed, particular at light load. At any operating point of induction motor characterized by the speed and torque, an optimal flux can be found that meets the requirements of the operating point and minimizes the overall losses. The methods for getting optimal value of flux classified broadly into two categories, one is search technique and second is loss model based technique. To implement loss model based technique, induction motor loss model is developed and optimal value of flux is obtained to give maximum efficiency of the motor. Maximum and minimum levels of flux and stator currents are forced as constraints in the algorithm. In search control method, which not require the knowledge of the loss model, DC link or input power of the machine drive is measured regularly at fixed intervals of time and optimal flux producing current or flux value is reached which results in minimum power input or stator current of the motor for the given values of flux and torque. Once dc link power is minimized the adjustment of flux is stopped and constant flux is maintained. These two methods implemented and compared each other, and main focus is on loss model based technique. For implementing loss model, induction motor model also developed on dq axis including core loss component.|
|Research Supervisor/ Guide:||Srivastava, S. P.|
|Appears in Collections:||MASTERS' DISSERTATIONS (Electrical Engg)|
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