University of Khartoum

Power Factor Correction Using Pwm with A Dc LoadPower Factor Correction Using Pwm with A Dc Load

Power Factor Correction Using Pwm with A Dc LoadPower Factor Correction Using Pwm with A Dc Load

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Title: Power Factor Correction Using Pwm with A Dc LoadPower Factor Correction Using Pwm with A Dc Load
Author: Elshari, Ismail Nasr Mandiel
Abstract: Power factor is the ratio of real power (kilo Watt) which is actually consumed by the equipment, to apparent power (kilo Volt Ampere) which is what must be supplied by the network. Power Factor is a measure of how effectively your system uses its electricity supply. A system with poor power factor draws more apparent power than real power. A low power factor is classed as less than 0.9. Certain loads such as inductive loads and capacitive loads reduce the value of this factor. A power factor of anything less than 1 means you may be paying more than you need for electricity supplied. You are charged more for this supply if you have a tariff with a (Kilo volt ampere) demand chargeinstead of Kilo Watt. The efficiency of (Alternating Current-Direct Current) and Direct Current-Direct Current) power converters that are used in many applications like Interruptible Power Supplies (UPS), inverter depends on power factor. Rectifiers used for (Alternating Current-Direct Current) conversion have high harmonic content, low power factor, low efficiency and large size of inductors and filters. Performance and efficiency of converters is increased by high power factor and low line current distortion. This requirement is usually satisfied by incorporating some form of PFC circuits to shape the input phase currents. In this thesis the conventional AC-DC converter is derived by SCR firing angle scheme to control the output voltage and current for capacitive load. These converters have a poor power factor. To increase the power factor PFC converters have been developed by using PWM techniques to achieve a power factor from 0.81 to 0.93. This simulation was implemented in the MATLAB Simulink environment and satisfactory results were obtained
URI: http://khartoumspace.uofk.edu/123456789/25812
Date: 2017


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