A novel Z-source boost derived hybrid converter for PV applications

This paper proposes a novel Z-source boost derived hybrid converter (ZSBDHC) that produces high gain dual output from a single DC input, which is the choice of a solar photovoltaic system. This has multiple advantages as lesser count of switches, high power processing capability and high reliability result in reduction of overall cost. Besides, the prime advantage of this topology is achieving high voltage gain for a low duty ratio. The system transfer function is derived and the stability of the system is studied with the aid of average state model of the converter under continuous conduction mode. The transfer function of the system exhibits the sixth order dynamic characteristics, which is reduced to second order approximation to design the control parameters and to develop the closed loop scheme. To prove the robustness of the ZSBDHC with voltage feedback control, it is examined with line, load regulation and set point variation. Computer simulation is done for the dynamic characteristics of the ZSBDHC. The experimental operation is also demonstrated to validate the simulated results.