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Author: search.filters.author.Kunakorn, A.Subject: search.filters.subject.System uncertainties

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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.
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    Design of robust load-frequency stabilizers of SMES in coordination with SSSC
    (2005-01-01)
    Ngamroo, I.
    ;
    Dechanupaprittha, S.
    ;
    Hongesombut, K.
    ;
    Mitani, Y.
    ;
    Kunakorn, A.
    This paper presents a design of robust load-frequency stabilizers of a superconducting magnetic energy storage (SMES) in coordination with a static synchronous series compensator (SSSC). As large load disturbances with changing frequency in the vicinity of the inter-area oscillations mode occur in an interconnected power system, a system frequency may be heavily perturbed and oscillatory. To stabilize frequency oscillations, a coordinated SMES with SSSC can be applied. On the other hand, variations of system parameters, several load changes etc., cause system uncertainties. To take such uncertainties into account, the multiplicative uncertainty is included in a system modeling. The structure of frequency stabilizer equipped with SMES and SSSC is a second-order lead/lag compensator. Control parameters of frequency stabilizers are automatically tuned by a tabu search. Simulation studies in a two-area interconnected power system confirm the effect of coordinated SMES with SSSC.