ENGLISH

Abstract

2 ABSTRACT: Because of advances in solid state power devices and microprocessors pulse width modulation (PWM) is widely used in power electronics and variable speed drives to digitize the power signal so that a string of voltage pulses can be procreated by the electronic switching devices like choppers. The PWM technique has been the main choice in power inverters and DC to AC converters for decades. Forasmuch of its circuit naivety and disparate control scheme PWM technique is oftentimes used in power applications such as in motor controllers and inverters etc. The preferment of PWM rooted switching power converter upon linear power amplifier in view of lower power dissipation, easy to implement and control, no temperature variation and aging-caused drifting or degradation in linearity and Compatible with today's digital systems. Unexpectedly because of the uses of power converters and variable speed drivers neither the voltage nor the current waveform remains impeccable. They endure harmonic contamination in addition with power losses and high frequency noise. These harmonic must be removed or minimized in the system to curtail and detract harmful effect on power supply system. In this document the concept of Pulse Width Modulation (PWM) for single-phase inverters, operating principles and effect of harmonic are analyzed. The results are comprised with simulation results for a single-phase inverter.