University of Khartoum

Power Factor Correction Using Pwm With Dc Load

Power Factor Correction Using Pwm With Dc Load

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Title: Power Factor Correction Using Pwm With Dc Load
Author: Mohammed, Awad Yasir Awad
Abstract: The electrical energy is almost exclusively generated, transmitted and distributed in the form of alternating current. Therefore, the question of power factor immediately comes into picture. Power factor is the relation between the kW and the kVA drawn by an electrical load where the kW is the actual load power and the kVA is the apparent load power. It is a measure of how effectively the current is being converted into useful work output and more particularly is a good indicator of the effect of the load current on the efficiency of the supply system, most of the loads are inductive in nature and hence have low lagging power factor. The low power factor is highly undesirable as it causes an increase in current resulting in additional losses of active power in all the elements of power system from power station generator down to utilization devices. In order to ensure most favorable conditions for a supply system from engineering and economic standpoint, it is important to have power factor close to unity as possible. In this thesis, solutions with single-phase power factor correction (PFC) capability are studied. Moreover, power electronics issues concerning SCRs switching speed considerations for optimizing the overall EMI and efficiency performance of continuous mode active PFC Converters. In addition, the design of the circuit prototype was presented and discussed. The correction mechanism proposed in this project is making use of power electronic devices to shaping input current to be in phase with voltage done by triggering the SCR at certain times to shape input current depending on how lower is PF. With the main objective of this project optimizing performance and cost indices of PFC converters, the results obtained were presented and implemented in MATLAB Simulink environment.
URI: http://khartoumspace.uofk.edu/123456789/25789
Date: 2017


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