Development of ripple reduced solar photovoltaic regulators using boomerang sliding mode control strategy

Abstract

SummaryDC–DC boost converters are extensively used in wide range of solar photovoltaic (PV) applications. A common problem in PV regulator is the presence of ripples in output voltage and output current, due to the oscillations in PV power, inaccurate switching, and inadmissible inductor peak currents. In general, conventional boost converters are widely used in PV regulator; however, conventional PWM‐controlled boost converters are upgraded to sliding mode controller (SMC)‐based PWM controllers, which has been elaborated in the literature. However, SMC‐based boost converter experiences the following problems: (i) presence of ripples in the output current and (ii) dynamic instability during sudden change in load current. This paper addresses the aforementioned problems and proposes a boomerang trajectory‐based SMC (BT‐SMC) control strategy for ripple mitigation in conventional DC–DC boost converters specifically used in PV regulator. BT‐SMC tracker tracks the reference wave shape and controls the duty cycle, with respect to the switching frequency to have a ripple mitigated output. This self‐adapting system provides an adequate reduction in ripples and rapid convergence of error nearest to zero. A detailed analysis on switching frequency transition, load variation, trajectory control, and its stability existence is conducted, and the proposed system is implemented using dSPACE‐MicroLabBox‐DS1202.