Development of a Novel Single Phase Non-isolated AC-DC Zeta Converter for Improved Power Quality

Abstract

Switched-mode power converters have been studied broadly and used in industrial products. The classification comes as Buck, Boost, and Buck-Boost for the basic topology in which a single inductor is used. Converters with higher-order topology like Cûk, SEPIC, and Zeta used two inductors. A new topology of single-phase single switch non-isolated AC-DC Zeta converter is presented in this research work. Different studies are carried out to analyze the result and suitable parameter values are tuned. The proposed converter provides better conversion efficiency than the conventional converter throughout the variation of the duty cycle. Maximum efficiency of 98.09% is achieved for 20% duty cycle. The proposed converter offered a lower input power factor than the conventional converter for lower and higher duty cycles. Suitable feedback control in a closed-loop system improved the input power factor. The proposed converter with a PFC controller provides a very high input power factor (0.99) which is almost close to unity. The proposed converter has lesser total harmonic distortion (THD) of the input current in comparison with the conventional one for higher duty cycles but for lower duty cycles the conventional converter shows better performance. Again, using the feedback controller, the THD of the input current is kept close to IEEE Standards for the proposed converter. The proposed converter with feedback controller provides higher conversion efficiency, reduced THD of input current, and quality power factor. Dynamic response of the proposed converter has also been observed. The proposed converter can maintain the desired level of output voltage with sudden changes in load. Simulation results for the analysis of the proposed circuit are obtained using PSIM Professional