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20171
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Subject: Electrical Engineering × Author: Gupta, Shobhit × Start date: 2003 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    A new approach for voltage sag estimation and effect of voltage sag on performance of induction motor
    (G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand), 2017-01) Gupta, Shobhit; Srivastava, Ajay
    Power quality has become a major concern in the recent time. Most of the power quality disturbances are due to voltage sag. Voltage sag can be characterized on the basis of its magnitude and duration. Since voltage sag is defined on the basis of its magnitude, hence it is very important to find out a method which can quantify the sag magnitude accurately. In this thesis a new hybrid method is proposed for the calculation of sag magnitude and duration. It has been found that this method estimates the sag more accurately in comparison to RMS voltage method and Peak voltage method. Minimum sampling frequency and size of sliding window is also proposed for the precise assessment of voltage sag. About 80% of the motors used in industry are induction motor. Electromagnetic torque generated by induction motor is directly proportional to the square of applied voltage. Hence during voltage sag, performance of the induction motor could be affected severely. In this thesis effect of voltage sag on induction motor performance has been investigated for various initial points on wave. To find out the effect of voltage sag on the rating and loading of induction motor, two different motors of 10 hp and 50hp power rating have been simulated on MATLAB SIMULINK platform. Simulation results have compared on the basis of current, torque and speed loss peak.