A novel ultra-high step-up power converter (UHSUPC) is proposed for wind input voltage range application in a renewable energy power systems. The proposed converter exhibits a much higher voltage conversion ratio without using the extremely large duty cycle. The voltage conversion ratio also has an extra factor of 1/(1-D) compared with all the high step-up converters proposed in the literature. It means that the voltage gain will increase more than twice as the duty ratio D is operated more than 0.5. The operating principle and state-state analysis are presented herein. Finally, a prototype of input voltage 40 V, output voltage 400 V, and output power 200 W prototype of the proposed converter is implemented to verify the theoretical analysis on the basis of the experimental results.