Yazar "Hukumen, Burhan" seçeneğine göre listele

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    Cascaded IMC & PI Digital Controller Comparison for Boost Converter with Non-Ideal Switch Modelled State-Space Averaging Method
    (Ieee, 2023) Hukumen, Burhan; Gokdag, Mustafa; Gulbudak, Ozan
    In this study, two different closed-loop digital controllers have been implemented for a CCM boost converter and advantages of the controllers have been compared. The first one was designed as cascaded PI controller and second one designed as cascaded internal model controller (IMC). In the modelling process of the boost converter, the sate-space averaging technique has been used considering equivalent series resistances (ESR) and non-ideal switch models which impact the response of the converter system. In order to make the designed controllers appropriate for digital control technique, they have been discretized by bilinear transformation method and Matlab/Simulink simulations have been realized as if digital controllers have been implemented through a digital signal processor (DSP). The response of the controllers against load change, reference changes and input voltage change has been observed and compared.
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    Performance Evaluation of D-Q Current Controller for Grid-Connected Full-Bridge Inverter Under Nonlinear Load Conditions
    (Ieee, 2024) Hukumen, Burhan; Gokdag, Mustafa; Gulbudak, Ozan
    In this study, a digital d-q frame current controller has been designed for an on-grid full bridge inverter with a critically damped LC filter. The d-q frame state-space model of the inverter has been derived for the current control design process. In order to ensure the synchronization with AC grid, a second-order generalized integrator (SOGI) mechanism with phase-locked loop (PLL) and frequency-locked loop (FLL) capability has been designed. Mathematical framework was tested using simulation tools. The control performance and harmonic analyses have been performed for the situations where AC grid is under the odd harmonic effects. According to the simulation results,, the designed d-q frame current controller ensures an injecting current to the AC grid within the boundaries of international power quality standards like IEC61000-3-2 under polluted grid condition.
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    Two Stage Dimmable PFC LED Driver Digital Controller Design and Analysis for Isolated SEPIC Converter
    (Ieee, 2023) Hukumen, Burhan; Gokdag, Mustafa; Gulbudak, Ozan
    This study proposes a two-stage power converter with power factor correction (PFC) capability for led dimming applications with a power rating of 200W. The initial stage of the proposed system adopts an isolated single ended primary inductance converter (SEPIC) which aims to ensure the reliability of the PFC operation, eliminate the current harmonics, and maintain the electrical isolation of the digital stage from AC mains. A low-bandwidth compensator for the PFC converter is designed based on the state-space averaged small-signal model of the SEPIC to attenuate the harmonic component at the twice frequency of the mains. A synchronous buck converter is utilized as the second stage to regulate the dynamics of the LED array current. The compensator of the LED driver is designed with a relatively wide bandwidth to achieve fast and robust dimming. The two-stage converter is simulated using PSIM. The simulation results verify that the converter can adjust the LED array's current while ensuring unity power factor operation for the mains input.