Three Phase Asymmetrical Pwm Full-Bridge Converter For Renewable Energy Sources

Abstract

      A highly efficient asymmetrical pulse-width modulated (APWM) full-bridge converter for renewable energy sources is studied in this project. The converter adopts full-bridge topology and asymmetric control scheme to achieve the zero-voltage switching (ZVS) turn-on of the power switches of the primary side and to reduce the circulating current loss. Moreover, the resonant circuit composed of the leakage inductance of the transformer and the blocking capacitor provides the zero-current switching (ZCS) turn-off for the output diode without the help of any auxiliary circuits. Thus, the reverse recovery problem of the output diode is eliminated. In addition ,voltage stresses of the power switches are clamped to the input  voltage. Due to these characteristics, the proposed converter has the structure to minimize power losses. It is especially beneficial to the renewable energy conversion systems. To confirm the theoretical analysis and validity of the converter, MATLAB based simulation studies are presented by changing the input voltage range from40V to 80V.