A comparative study of FNN‐based dynamic sliding mode control for DC‐DC converters

Abstract

SummaryIn this paper, a dynamic sliding‐mode variable‐structure control (VSC) is proposed for the voltage tracking control for DC‐DC boost converters, combining with a type of fuzzy neural networks (FNNs) based on different membership functions. In terms of the uncertainties from parameter perturbations and unmodeled dynamics in the DC‐DC converter, the FNNs including, respectively, Gaussian membership functions and ellipsoidal‐type membership functions are employed to approximate the uncertainties. Based on an average model for the present converter, a novel dynamic VSC that is induced by an auxiliary dynamics of the duty cycle is designed, by exploring an ideal line sliding surface based on the reference inputs and the duty cycle for the converter. Under the basis of the adaptive FNN dynamic VSC law, the tracking error system of the DC‐DC boost converter is analyzed to be boundedly stable. Eventually, the validation and the superiority of the proposed dynamic VSC method are shown in some comparative simulations.

Newly designed single‐stage dual leg DC‐DC/AC buck‐boost converter for grid connected solar system

“…Double inductor unfolding DC-AC converter with correct gain factor and output voltage is given in Equation ( 2). Boost output voltage is derived from input DC voltage V dI and duty cycle, which is given in duty cycle (2).…”

“…One such converter is the newly designed single-stage dual-leg DC-DC/AC buck-boost converter for grid-connected solar systems. 1,2 This converter combines the buck-boost converter with the dual-leg inverter in a single-stage configuration. 3,4 It features several benefits over traditional converters, including reduced size, improved efficiency, and reduced cost.…”

“…The rapid expansion of nonconventional energy systems, particularly solar systems, has led to the need for highly efficient and reliable power electronics converters. One such converter is the newly designed single‐stage dual‐leg DC‐DC/AC buck‐boost converter for grid‐connected solar systems 1,2 …”

Design and implementation of dual‐leg generic converter for DC/AC grid integration

“…1,2 So, modern trending concepts are based on DC microgrids. 3,4 Step-up or step-down with transformer is possible in AC supply. Effective utilization and proper distribution of energy are required; some reports stated that DC transmission is better than AC transmission because of efficiency in many cases.…”

“…Several years are over since the power demands are continuing; moreover, most of the alternate energies are based on DC devices/circuits, and DC usage‐based topics are renewed vigor with reviving 1,2 . So, modern trending concepts are based on DC microgrids 3,4 . Step‐up or step‐down with transformer is possible in AC supply.…”