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    Design and Modelling of Three-Port Bidirectional DC-DC Converter for PV-Battery Integrated DC Microgrid Systems
    (IEEE Computer Society, 2024) Ayten, Kenan; Savrun, Murat Mustafa
    This paper proposes a novel non-isolated bidirectional three-port converter (TPC) based on a KY boost converter and an interleaved boost converter for photovoltaic (PV) powered and battery-buffered systems. The proposed three-port converter integrates ports of the PV array, battery pack and DC microgrid bus bar. Proposed converter is composed of two power switch, an LC filter for battery, boost inductor for PV array and KY boost converter, which is consist of a charge pump capacitor and two series switches. In the proposed converter, the charge pump capacitor and boost inductor provide a voltage gain, thus, the number of series battery cells and PV array can be reduced for a lower cost. On the other hand, a two-control loop scheme has been designed to control power flow between the ports and perform a smooth transition between the loops. To test the effectiveness of the proposed TPC, a MATLAB/Simulink-based simulation model has been developed with a 1 kW PV array, 37 V 10 Ah battery pack and 64 V DC microgrid. The performance of the proposed converter has been analyzed for different case studies and loading conditions. According to the simulation results, 96% peak efficiency of the converter has been achieved and maximum power from PV has been extracted with MPPT mode selection. The results show that the proposed converter has some advantages in terms of the number of switches, multi-loop control, bidirectional power flow, cost and efficiency. © 2024 IEEE.
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    Öğe
    Maximum Power Point Tracking Performance Benchmarking of High Step-Up DC-DC Converters
    (2022) Ayten, Kenan; Savrun, Murat Mustafa
    Renewable energy sources (RESs) such as photovoltaic panels (PV) and fuel cells (FC) are frequently equipped with DC-DC converters to regulate output voltage and to extract maximum energy because of their intermittent nature. In addition to regulation capability, the DC-DC converters need to increase low output voltage levels of RESs with their high gain capability. Although conventional boost converters are a good candidate to reduce the number of series-connected PV panels, they have recently been replaced by high voltage gain step-up DC-DC converters due to the disadvantages of limited voltage gain and high switching stress. The main aims of the high gain converters are to provide high voltage gain and to extract maximum power from the PV systems. In this paper, the benchmarking of maximum power extraction capabilities of high step-up DC-DC converters for PV-powered systems, have been presented. Three different high gain step-up DC-DC converter topologies: (i) quadratic boost converter (QBC), (ii) three level boost converter (TLBC), (iii) stacked boost converter (SBC) have been analysed under maximum power point tracking (MPPT) mode that uses the Perturb and Observe (P&O) algorithm. 5.11 kW PV-powered system has been modelled in the MATLAB/Simulink environment for each converter using same design parameters. The aforementioned converters are simulated under different irradiances: 1000, 900, 850, 750 and 700. The performance comparison of the converters has been conducted for such metrics; the maximum PV power, converter efficiencies, output current and voltage ripples. Performance results show that; the TLBC topology excels with the advantages of higher energy extraction capability and efficiency values. The efficiency values of the converters are 98.9%, 98.1%, and 96.5% for TLBC, SBC, and QBC, respectively.