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Author: search.filters.author.Dechanupaprittha, S.Subject: search.filters.subject.System uncertainties

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    Stabilization of tie-line power oscillations by robust SMES in interconnected power system with large wind farms
    (2009-12-16)
    Ngamroo, I.
    ;
    Cuk Supriyadi, A. N.
    ;
    Dechanupaprittha, S.
    ;
    Mitani, Y.
    This paper proposes a robust controller design of Superconducting Magnetic Energy Storage (SMES) for stabilization of interconnected power systems with wind farms. The inverse additive perturbation is applied to represent system uncertainties such as variation of system parameters, several generating and loading conditions etc. The structure of active and reactive power controllers of SMES is the first-order lead-lag compensator. To tune the controller parameters, the optimization problem is formulated based on the enhancement of additive stability margin. The particle swarm optimization is used to solve for controller parameters. Simulation studies in a six-area interconnected power system with wind farms confirm the robustness of the proposed SMES against various system operating conditions.
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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.