Harmonic pollution and low power factor in power system caused by power converters have been a great concern. Keywords: Improved Quality Converters, PWM Generator, Three-Phase AC/DC Flyback and Cuk Converters, Total Harmonic Distortion (THD), Power Factor Correction.ĪC/DC power converters are broadly used in various applications like power supplies, dc motor drives, front- end converters in adjustable-speed ac drives, HVDC transmission, SMPS, in process technology like welding, power supplies for telecommunications systems, aerospace, military environment and so on. The performance of the three phase AC/DC Flyback and Cuk converters are verified at 220 Vrms phase voltage, 8400W and 750 W output power respectively through MATLAB/simulation model and a good consistency is achieved. The main design objective is to produce the lowest cost within a small-size system The study includes the use of optimum number of cells to be interleaved and the associated phase shifts among the cells are determined on the design of a isolated flyback transformer with the lowest leakage inductance and selection of components providing the lowest parasistic effects critical for obtaining high efficiency and good performance. The primary market target of the converter is within the telecommunications industry where it supplies high-quality dc power to the telecom loads and performs high-capacity battery charging while providing zero harmonic emission and unity power factor to the utility grid. Comparisons of three phase converters is done to identify the converters with low cost/high efficiency for the system by reducing number of stages and improve quality in terms of power factor correction, reduced THD at input ac mains and regulated dc output. L.Bullaya College of Engineering For Women,Ībstract: This paper presents the comparative analysis of improved quality three phase AC/DC Flyback and Cuk converters, using SIMULINK. Andhra Pradesh, India.ģHead of the Department, Electrical Engineering,Dr. V.Sree Vidhya1, M.Gopi Chand Naik2, D.Deepak Chowdhar圓ġME Scholar (Power Electronics and Drives), Department of Electrical Engineering, Andhra University, Visakhapatnam-ĢAssistant Professor, Department of Electrical Engineering, ,Andhra University, Visakhapatnam-530003. Figure 2: An isolated Cuk Converter.Comparative Analysis Of Improved Quality Three Phase AC/DC Converters Based On Flyback And Cuk Topologies
(10 Points) d) What is the average current going through the magnetizing inductance LM? Why? (5 Points). (10 Points) b) What is the steady-state voltage conversion ratio V2/V1 of this topology as a function of the switch duty ratio D? (10 Points).Ĭ) Find the switch implementations of Si and S2 so that both Vı and V2 are positive, and power is delivered from left to right. a) Please find the steady-state voltage Vc1 on capacitor C1, and Vc2 on capacitor C2 as functions of one or more of Vi, V2, Lı, L2, Cl, C2,N1, N2, R. The magnetizing inductance is very large (LM> Li&L2) and the leakage inductance is very small (negligible). Assume the transformer is an ideal transformer with a turns-ratio of N1:N2. Assume the duty ratio of the S1 (the time when it is on) is D, and S2 is switched in complementary with S1 (duty ratio is 1-D). You may assume that the converter operates in periodic steady state with small ripple on the inductor currents and capacitor voltages.
Transcribed image text: Figure 2 shows a type of dc-dc converter known as an isolated Cuk converter.