Implementation of PWM Based Firing Scheme for Multilevel Inverters Using Microcontroller

Dash, Debendra and Pattnaik, Bhabani Shankar and Mukherjee, Joydeep (2009) Implementation of PWM Based Firing Scheme for Multilevel Inverters Using Microcontroller. BTech thesis.

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The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. Inverters can be broadly classified into single level inverter and multilevel inverter. Multilevel inverter as compared to single level inverters have advantages like minimum harmonic distortion, reduced EMI/RFI generation and can operate on several voltage levels. A multi-stage inverter is being utilized for multipurpose applications, such as active power filters, static var compensators and machine drives for sinusoidal and trapezoidal current applications. The drawbacks are the isolated power supplies required for each one of the stages of the multiconverter and it’s also lot harder to build, more expensive, harder to control in software.
This project aims at generation of carrier based PWM scheme using POD strategy through the means of an AT89C51 microcontroller. The salient features are: Firstly, Both the high frequency triangular carrier wave and the sinusoidal reference signal are being generated in the microcontroller. The digital to analog converter(DAC0808)is then employed for converting them into their analog signal forms An opamp based comparator then compares these two carrier & reference signals to give us the desired sinusoidal pulse width modulated signal as the required final-output. The PWM signal thus generated is then used as triggering pulses for the multilevel inverters.

Item Type:Thesis (BTech)
Uncontrolled Keywords:Inverters,Multilevel Inverters,PWM Schemes
Subjects:Engineering and Technology > Electrical Engineering > Power Systems
Divisions: Engineering and Technology > Department of Electrical Engineering
ID Code:288
Deposited By:Debendra
Deposited On:13 May 2009 11:30
Last Modified:13 May 2009 11:30
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Supervisor(s):Panda, A K

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