Design and modelling of a new three winding coupled inductor based high step‐up DC–DC converter for renewable energy applications

Abstract

This paper proposes a new three winding coupled inductor (TWCI) based DC–DC converter with high voltage gain capability. Continuous input current with low ripple, low number of components, simple structure, high efficiency, and common ground between input and output ports make it suitable for renewable energy applications such as photovoltaic (PV) systems. Voltage multiplier cells (VMCs) are utilized to enhance the output voltage and reduce the voltage stress across the power switch. The voltage gain can be adjusted by the duty cycle of the power switch and turns ratio of the TWCI. Thus, a flexible voltage gain is obtained, and there is no need for a higher duty cycle. On the other hand, the proposed converter has only one power switch with reduced voltage stress and low ON-state resistance. Therefore, a low-rated power switch can be used, which decreases the cost and volume of the presented converter. Operation principles, steady-state analysis, and comparison with other similar structures are provided. To frequency behaviour investigation, modelling and dynamic analysis are presented. Additionally, the effect of the proposed converter's parameters on the frequency response is evaluated. Finally, experimental results are presented to prove the effectiveness of the suggested converter.