An innovated nonlinear voltage regulator for DC/DC converters: Theoretical and experimental results on PV appplications

In this paper, a nonlinear dynamic controller is proposed for regulating the dc bus voltage of a DC/DC boost power converter in a stand-alone photovoltaic system. The controller is proven to achieve the desired voltage regulation independently from the PV source voltage, the converter parameters and the kind of the load. Extended mathematical analysis shows that the proposed control scheme guarantees damping characteristics (passivity) of the closed-loop system, which represents a fundamental property for achieving stability at the desired equilibrium. Simulation and experimental results verify the controller efficiency for a single resistance-inductance load case and for a nonlinear load consisted of a three-phase voltage source inverter and a three-phase resistance-inductance.