Прегледај по Аутор "Šekara, Tomislav B."

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    Analysis of the Band-Pass and Notch Filter with Dynamic Damping of Fractional Order Including Discrete Models
    (ETF – School of Electrical Engineering, University of Belgrade, 2018) Bošković, Marko; Šekara, Tomislav B.; Rapaić, Milan R.; Lutovac, Budimir; Daković, Miloš; Govedarica, Vidan
    The paper presents analysis of the second order band-pass and notch filter with a dynamic damping factor βd of fractional order. Factor βd is given in the form of fractional differentiator of order , i.e. βd=β/s, where β and  are adjustable parameters. The aim of the paper is to exploit an extra degree of freedom of presented filters to achieve the desired filter specifications and obtain a desired response in the frequency and time domain. Shaping of the frequency response enables achieving a better phase response compared to the integer-order counterparts which is of great concern in many applications. For the implementation purpose, the paper presents a comparison of four discretization techniques: the Osutaloup’s Recursive Algorithm (ORA+Tustin), Continued Fractional Expansion (CFE+Tustin), Interpolation of Frequency Characteristic (IFC+Tustin) and recently proposed AutoRegressive with eXogenous input (ARX)-based direct discretization method.
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    Novel Band-Pass and Notch filter with Dynamic Damping of Fractional Order
    (2017) Bošković, Marko; Šekara, Tomislav B.; Rapaić, Milan R.; Lutovac, Budimir; Daković, Miloš; Govedarica, Vidan
    The paper introduces a novel the second order band-pass and notch filter with dynamic damping factor βd of fractional order. Indeed, the factor βd has a form of fractional differentiator of order α, i.e. βd=β/s α, where β and α are adjustable parameters. Shaping of the frequency response enables achieving better phase response compared to the integer-order counterparts which is of great concern in many applications. The aim of the paper is to exploit an extra degree of freedoms of presented filters to achieve the desired filter specifications and obtain desired response in the frequency and the time domain.
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    Novel tuning rules for PIDC controllers in automatic voltage regulation systems under constraints on robustness and sensitivity to measurement noise
    (ELSEVIER, 2024) Bošković, Marko Č.; Šekara, Tomislav B.; Stojić, Djordje M.; Rapaić, Milan R.
    This paper presents a novel analytical method for designing the Proportional-Integral-Derivative controller with serial Compensator (PIDC) for automatic voltage regulation (AVR). The primary focus of this method is to address constraints related to robustness and sensitivity to measurement noise. The key concept behind this proposed design method lies in selecting a specific complementary sensitivity function, which is determined by two adjustable parameters, λ affecting performance and N primarily affecting robustness to measurement noise. The ultimate goal of the PIDC controller design is to achieve enhanced rejection of load disturbances and ensure satisfactory reference tracking. The method proposed in this paper offers a combination of flexibility and simplicity, providing new analytical tuning formulas for PIDC controller based on a pair of adjustable parameters affecting the trade-off between performance and robustness. The paper thoroughly analyzes the dependencies of performance and robustness indices on the design parameters, elucidating the associated trade-offs in detail. A comparative analysis with respect to two recently proposed optimal design methods has been performed in a simulation setting. Subsequently, the effectiveness of the proposed analytical method has been experimentally validated using a small-scale synchronous generator in a laboratory setting. The application of the proposed approach, resulting in enhanced suppression of disturbances is improved, as evidenced by improvements in the Integral of Absolute Error (IAE). Additionally, the proposed design method demonstrated robustness against uncertainties in the plant model and the measurement noise.