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Abstract
This paper has discussed the effect of harmonics on the power quality of the power supply. The paper also discussed the different configurations of PWM techniques for harmonic reduction and improvement of fundamental peak voltage. In addition, a comprehensive comparison of all configurations is made in terms of THD, FFT and dominating harmonics components. This paper describes the results on the basis of MATLAB simulation. It is shown how, with suitable modifications. The conventional Regular Sampled PWM technique can be simply extended to allow Harmonic Minimization and also Harmonic Elimination PWM to be closely reproduced using simple algebraic equations. This survey paper will provide the insight of trends and technology of "Power Quality Improvement using PWM Technique.
Index Terms:-FET, Power Quality, PWM Techniques, THD.
I. INTRODUCTION
Power Quality: There is a lot of confusion on the meaning of the term 'power quality', not in the least because 'power' is used as a synonym for 'electricity' in American English whereas it is also the energy transport per unit of time. Different authors use different definitions.
A consistent set of definitions is given as follows:
Voltage quality is concerned with deviations of the voltage from the ideal. The ideal voltage is a single frequency sine wave of constant amplitude and frequency. Current quality is the complementary term to voltage quality. It is concerned with the deviation of the current from the ideal. The ideal current is again a singlefrequency sine wave of constant amplitude and frequency, with the additional requirement that the current sine wave is in phase with the voltage sine wave.
Power quality [1] is the combination of voltage quality and current quality. Quality of supply is a combination of voltage quality and the non-technical aspects of the interaction from the power network to its customers. Quality of consumption is the complementary term to Quality of supply.
II. PWMTECHNIQUES
Because of advances in solid state power devices and microprocessors, switching power converters are used in more and more modern motor drives to convert and deliver the required energy to the motor. The energy that a switching power converter delivers to a motor is controlled by Pulse Width Modulated (PWM) signals applied to the gates of the power transistors. PWM signals are pulse...