A Comparison Between Static and Dynamic Performances of a Z-source and a Dual-Stage Boost Converter Under SMC for PV Energy Applications

A comparative study is carried out for the static and dynamic performances of a Z-source converter and a cascade interconnection of two DC-DC boost converters in their potential use for high conversion ratio PV energy applications. A Sliding-Mode Control (SMC) is used for both systems which are operated at the same conditions. Their stability analysis is carried out and their efficiency are compared analytically and validated by numerical simulations using PSIM software. It is shown that the dual-stage boost converter outperforms and the Z-source converters when used in impedance matching between a PV generator and a resistive load.