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Browsing by Author "Kart, Sude"

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    Article
    Design and Application of Pem Fuel Cell-Based Cascade Boost Converter
    (Springer, 2019) Kocaarslan, Ilhan; Kart, Sude; Genc, Naci; Uzmus, Hasan
    This paper presents average sliding current controller (ASCC) for the proton membrane exchange fuel cell (PEMFC)-based DC-DC cascade boost converter under different source and load conditions. PEMFC which has variable voltage and current can be used in a lot of applications with a wide operating range in low temperatures. However, as the PEMFC produces low nonlinear voltage, this lower nonlinear voltage value needs to be increased as a linear voltage with an appropriate power electronics converter. Therefore, this paper proposes DC-DC cascade boost converter which has a higher voltage gain for PEMFC stack. First, a classical PI controller was applied to regulate the output voltage. Then, the current of the PEMFC-based DC-DC cascade boost converter was controlled via ASCC by using output of the voltage controller. After analyzing the dynamic model of the PEMFC-based DC-DC cascade boost converter via MATLAB/Simulink program, the experimental results of the controlled PEMFC-based DC-DC cascade boost converter are observed and discussed.
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    Article
    Lyapunov Based Pi Controller for Pem Fuel Cell Based Boost Converter
    (int Journal Renewable Energy Research, 2020) Kocaarslan, Ilhan; Kart, Sude; Altun, Yener; Genc, Naci
    Proton Exchange Membrane Fuel Cell (PEMFC) which is an efficient renewable energy system has usage area in home and industrial applications. Since the generated voltage from PEMFC is low, the output voltage of it can be increased by using a boost converter. The boost converter fed by PEMFC can normally be controlled by the classical PI controller which parameters (K-P, K-i) are constant and do not depend on the circuit parameters. Therefore, these coefficients are non-adaptive at variable load situations. In this study, an improved controller is obtained by regulating the PI controller according to Lyapunov stability theorem. Then, this improved Lyapunov based PI controller is proposed for PEMFC based boost converter. In the proposed method, K-P and K-i parameters vary adaptively depending on the circuit parameters. Thus, the system works more stable and settling time of system's output voltage signal decreased compared to classical PI controller. The proposed method has been successfully tested in Matlab/Simulink environment.