Analysis of Different Converters for Reduced Total Harmonic Distortion and Improved Power Factor (original) (raw)
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Evaluation of various converters for decreased total harmonic distortion and progressed Power Factor
2018
energy electronics is a enormous region in electrical engineering for research which incorporates different switching gadgets to manipulate and switching of electrical machines and drives for his or her output, velocity and torques and so forth. it has many programs in our ordinary life together with motor drives, and energy resources for pc. the ‘modern’ drawn by means of those devices is distorted so there is a need to use electricity element correction converter. on this paper a comparative evaluation of different topologies of ac–dc converter is completed for total harmonic distortion and enriched energy factor. the model is simulated in matlab and their outcomes are proven. Keywords—THD; PFC; PFC Boost Converter; PFC Double Boost Converter.
Review of AC-DC power electronic converter topologies for power factor correction
International Journal of Power Electronics and Drive System (IJPEDS) , 2019
Increased harmonic content and low power factor in power systems caused by power converters have been of great concern. To overcome this, several converter topologies employing advanced semiconductor devices and control schemes have been proposed. The aim of this paper is to identify a low cost, small size, efficient and reliable ac to dc converter to meet the input performance index of uninterrupted power supply. In this paper, comparison between three converters namely AC-DC Cuk rectifier, Fly back converter & Interleaved SEPIC converter have been carried out. For the above converters both bridged and bridgeless topologies have been analysed. The working of all the three types of converter has been illustrated with relevant waveforms followed by the simulation results. Comparison of the three converters have been done based on the parameters namely Displacement Factor, Supply Power Factor& supply THD. The results are verified.
COMPARATIVE STUDY OF CONVERTERS POWER FACTOR CORRECTION TECHNIQUES
International Journal of Research in Engineering and Applied Sciences (IJREAS), 2017
In this paper, static converter AC input power factors (P -F.) and its improvement techniques are comparatively studied. The converters under this scope of study are the phase-controlled a.c. to d.c. converter, the pulse width modulation (P.W.M) a.c. to d.c. converter and a.c. input current shaped a.c. to d.c. converter. The study is intended to provide converter users with power factor characteristics of different converters so that appropriate converter types can be selected to meet specified applications without violating professional standards in the tolerable levels of electromagnetic interference. Using Fourier series power factors of the above -named, phase-controlled converters were calculated and then simulated with computer using MATLAB. The analysis results (simulated curves) are as displayed in the pa pers for comparative studies, showing that current P. W.M in which the current is in phase with the voltage is the best.
International Journal of Advance Research and Innovative Ideas in Education, 2019
The present scenario is trending towards quality power supply. There are different parameters which decides the power quality like continuity, wave shape, wave distortion, ripples, flickering, harmonics etc. In this paper the method of reduction of total harmonic distortion for AC – to- DC converter with improved power factor by implementing a boost converter along with the PID controller. To prolong the life time of electronic circuits the electrolytic capacitor is excluded as the electrolytic capacitors weakens with time. The power-factor-correction (PFC) circuit for ac-to-dc converters is based on boost conversion with power decoupling. The controlled conventional machine is hired to reallocate the excessive electricity to the inefficient side of the ac side through decoupling the input power into a dc aspect . Instead of using a large electrolytic capacitor with the boost converter , the conventional energy law follows the track of minimum errors in Vref and Pref which is config...
A Proficient AC/DC Converter with Power Factor Correction
Dc power supplies are extensively used inside most of electrical and electronic appliances such as in computers, televisions, audio sets and others. Power supplies make the load compatible with its power source. The presence of nonlinear loads results into low power factor operation of the power system. Several techniques for power factor correction and harmonic reduction have been reported and a few of them have gained greater acceptance over the others. In this paper a bridgeless power factor correction boost converter is proposed which results in improved power factor and reduced harmonics content in input line currents as compared to conventional boost converter topology. Bridgeless power factor correction boost converter eliminates the line-voltage bridge rectifier in conventional boost power factor correction converter, so that the conduction loss is reduced.
Scholars Journal of Engineering and Technology , 2020
Power factor correction is a way of counteracting the undesirable effects of electric load that create power factor less than unity. The word "converter" in wider perspectives include all the devices that convert electrical energy from one form to another, e.g. inverters, rectifiers or power pack. The term can also denote frequency converter and/or circuit that beat signals together to form a new signal frequency. Pulse Width Modulation (P.W.M) is a method of varying the mark-to-space ratio of the output voltage waveform during a cycle so as to minimize the magnitude of harmonics in the output. Modulation may be done by using transistors as switches instead of thyristors because transistors have much higher switching frequencies, thus, leading to improve and more efficient operation of the thyristors with switching time of about 1 to 2 seconds. In this paper, a single-phase and three-phase bridge rectifier circuits' power factors were modeled and simulated in MATLAB. The resulting voltage wave forms displayed in Figures 4 and 5 respectively showed that P.W.M method is a premier compared with other methods and is also better at low output voltage demand. Again, by using several pulses in each half cycle of the output voltage, it can reduce harmonic contents at low output voltages. In P.W.M, control is made independent of alpha (), the firing angle of thyristor, and as such all the switching loss problems and electromagnetic interference (EMI) noise associated with switches/switching are totally eliminated here.
Influence of Switching Elements on Harmonics and Power Factor Improvement
Increasing demand for electrical energy by utilities has necessitated efficient utilization of available power. Most of the loads in the industry and domestic applications are inductive in nature causing a lagging power factor. This causes a reduction in the utilization of the power input. For the same power input the utilization can be improved by improving the power factor. Further the presence of harmonics results in poor quality of the power leading to losses. . In present days, solid state electronics control electric motors are frequently used for drive control (speed and torque). This can introduce harmonics in current and voltages. The general opinion among technologists is that improvement in power factor reduces losses in an electrical system. Although this is true in a general way, it is not so in systems which use switched electronic devices that can introduce large amount of harmonics .
POWER FACTOR CORRECTION CONVERTER FOR AC DRIVES
— In this paper deals with a power factor correction (PFC) converter for AC drives using pulse width modulation current control technique and also presents a topology for driving a three phase induction motor with a single phase AC supply is proposed. Single phase buck and boost DC-DC converter is used to obtain near unity power factor and to reduce the harmonic distortion in the main supply. The proposed scheme is simulated in MATLAB-2010-SIMULINK. In the proposed scheme VHDL coding was developed to generate the sinusoidal PWM gate signal of proposed PFC converter. A three phase, 415V, 0.5Hp, 3 phase induction motor is used as load for testing the developed hardware. The simulation and experimental result confirms that power factor has been increased for all loads.
IJERT-Power Factor and Harmonic Analysis in Single Phase AC to DC Converter
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/power-factor-and-harmonic-analysis-in-single-phase-ac-to-dc-converter https://www.ijert.org/research/power-factor-and-harmonic-analysis-in-single-phase-ac-to-dc-converter-IJERTV4IS040599.pdf This paper analyses the low power factor and harmonic issues in AC to DC converters i.e. conventional diode bridge rectifier and PWM rectifier. The peaky current drawn by the capacitor in diode bridge rectifier is the reason for high total harmonic distortion (THD) and low power factor. This problem can be overcomed by replacing the diode in bridge rectifier with IGBT and pulses given to these switches can be controlled to obtain a unity power factor and low THD. Such rectifier circuit is known as Pulse Width Modulated (PWM) rectifier. The circuits are simulated in MATLAB using simulink and the waveforms are analysed for harmonics, power factor and THD.