Preeti, G.A.Karthikeyan, A.2026-02-042024Clean Energy, 2024, 8, 2, pp. 73-8425154230https://doi.org/10.1093/ce/zkae006https://idr.nitk.ac.in/handle/123456789/21199This paper proposes a multiport bidirectional non-isolated converter topology that provides advantages in terms of simultaneous multiple operations, single-stage conversion, high power density and reduced power losses due to the lower number of switches. The proposed multiport converter uses a centralized non-linear controller known as a finite control set model predictive controller to manage the flow of power between different ports. It deals with the parallel operation of photovoltaic and battery energy storage systems for stand-alone alternating current (AC) systems. The converter connects the lower voltage battery to the photovoltaic port using a bidirectional buck/boost converter and the photovoltaic port is linked to the stand-alone AC load through a three-phase full-bridge inverter. Each leg of the three-phase converter will act as a bidirectional direct current (DC)/DC converter as well as an inverter simultaneously. Only six switches manage the power transfer between all the connected ports of photovoltaic-battery energy storage system linked to the stand-alone AC load. The proposed multiport converter is mathematically modelled and controlled by a finite control set model predictive controller. The system is validated in simulation (1-kW rating) and experimental environment (200-W rating). The hardware prototype is developed in the laboratory and the controller is implemented on the field-programmable gate array board. Two independent case studies are carried out to validate the efficacy of the system. The first scenario is for a change in solar irradiance, while the second scenario is for a change in the output load. © The Author(s) 2024. Published by Oxford University Press on behalf of National Institute of Clean-and-Low-Carbon Energy.Battery storageBoost converterControllersElectric batteriesElectric impedance measurementElectric invertersEnergy transferField programmable gate arrays (FPGA)Linear control systemsAlternating currentCurrent-converterDirect current converterDirect current/alternating current converterDirect current/direct current converterDirect-currentFinite control setFinite control set model predictive controllerModel predictive controllersMulti-portMultiport converterPV-BESSSet modelsThree-phase converterModel predictive control