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Simulation and Experimental Validation of Common Mode Voltage in Three Phase Induction Motor Driven by Five Level Inverter Using PIC Microcontroller

Reddy Sudharshana K 1, V Muralidhara 1, A Ramachandran 2, and R Srinivasan 2
1. EEE, SET, Jain University, Bangalore, India
2. Vemana Institute of Technology, Bangalore, India
Abstract—The Induction Motor is considered to be a constant speed motor. Squirrel-cage induction motors are widely used in industrial applications. Due to the advancement in power electronics and in microprocessor technology the speed of the Induction Motor can be varied within certain limitations. There are many methods to control and run the induction motor in Variable speed drive applications. The speed of an induction motor can be varied by changing the frequency of the AC voltage applied on the stator. The amplitude of the AC voltage applied on the stator should be proportional to the frequency, to maintain a constant air gap flux. Speed of an induction motor can be controlled by maintaining the voltage to frequency ratio constant. The method of V/f control gives good performance under steady-state, which is sufficient for motor drive industrial applications. The basic method is 2-level inverter controlled by the microcontroller using the space vector modulation method. By this method the output of the inverter will be Non- sinusoidal and hence at the star point of the load there exists a Voltage with respect to ground and it is known as Common Mode Voltage, which produces electromagnetic interference. To lower the Common Mode Voltage a higher level of inverter can be used. By using the 5-level inverter the common mode voltage can be minimized when compared to 2-level and 3-level inverter. In this paper the authors have discussed the 5-level inverter driving the induction motor by simulation using MATLAB-Simulink and by Experiment. Fast Fourier transform has been done using the signal Analysis software and results are plotted with frequency versus voltage. The Common Mode Voltage is measured using Agilent make mixed signal oscilloscope. In the conclusion, the result of 5-level inverter common mode voltage is compared with 3-level and 2-level inverter values are compared with different operating frequencies of Induction Motor is shown in the table.
 
Index Terms—common mode voltage, induction motor, three phase voltage source 2/3/5-level inverter, pulse width modulation, space vector modulation

Cite: Reddy Sudharshana K, V Muralidhara, A Ramachandran, and R Srinivasan, "Simulation and Experimental Validation of Common Mode Voltage in Three Phase Induction Motor Driven by Five Level Inverter Using PIC Microcontroller," International Journal of Electronics and Electrical Engineering, Vol. 6, No. 4, pp. 65-70, December 2018. doi: 10.18178/ijeee.6.4.65-70
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