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Author: search.filters.author.Kaitwanidvilai, S.Subject: search.filters.subject.H∞ loop shaping control

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    Robust frequency stabilization in a microgrid system
    (2009-12-16)
    Vachirasricirikul, S.
    ;
    Ngamroo, I.
    ;
    Kaitwanidvilai, S.
    ;
    Chaiyatham, T.
    This paper proposes a new design of a robust control and monitoring system (RCMS) for robust stabilization of frequency fluctuation in a microgrid (MG) system. In MG system, the power sources consists of wind power (WP), photovoltaic (PV), microturbine (MT) and fuel cell (FC). Due to WP, PV and load fluctuations, the frequency stabilization of RCMS is performed by adjusting the power outputs of MT and electrolyzer system (ES) in both islanding and interconnected utility grid operations. The structure of MT and ES controllers is a proportional integral (PI). To enhance the robustness of designed controllers against system uncertainties, controller parameters of MT and ES are concurrently tuned by the particle swarm optimization based on a specified-structure H<inf>∞</inf> loop shaping control. Simulation results display the effectiveness and robustness of the proposed RCMS against system parameters variation and several operating conditions.
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    H∞ loop shaping-based robust control design of PSS and TCSC for dynamic stability enhancement
    (2008-10-06)
    Cuk Supriyadi, A. N.
    ;
    Ngamroo, I.
    ;
    Kaitwanidvilai, S.
    ;
    Kunakorn, A.
    ;
    Hashiguchi, T.
    In this paper, the robust control design of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) for enhancement of power system dynamic stability is proposed. To take system uncertainties such as variations of system parameters, several loading conditions etc., into account, the normalized coprime factorization is used to represent unstructured uncertainties in the system. The H∞ loop shaping technique is applied to design robust PSS and TCSC controllers. Simulation results in a single machine infinite bus system show that the performance and robustness of the proposed H∞ controllers of PSS and TCSC are superior to those of the conventional PSS and TCSC. © 2008 IEEE.
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    Robust pitch controller design in hybrid wind-diesel power generation system
    (2008-09-23)
    Cuk Supriyadi, A. N.
    ;
    Ngamroo, I.
    ;
    Kaitwanidvilai, S.
    ;
    Kunakorn, A.
    ;
    Hashiguchi, T.
    In this paper, the robust control design of pitch controller for frequency control in a hybrid wind-diesel power generation system is proposed. The structure of the pitch controller is a 1<sup>st</sup>-order lead-lag compensator. To take system uncertainties into account, the coprime factorization is applied in system modeling. To obtain the controller parameters, the performance and stability conditions of H<inf>∞</inf> loop shaping technique are used to formulate the optimization problem. The genetic algorithm is employed to solve the problem. Simulation studies show the frequency control effect and robustness of the proposed controller against system uncertainties in comparison with a variable structure pitch control. ©2008 IEEE.