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Author: search.filters.author.Leelajindakrirerk, M.

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    Analysis of power system event using synchronized PMUs in Thailand power network
    (2007-12-01)
    Ngamroo, I.
    ;
    Kunakorn, A.
    ;
    Leelajindakrirerk, M.
    ;
    Mitani, Y.
    ;
    Dechanupapritta, S.
    This paper applies the synchronized phasor measurement units (PMUs) based wide-area monitoring system to analyze the power system event under the occurrence of large disturbance. The salient feature of the monitoring system is the convenient installation of PMU at 220 V home outlet. The power system event given here is the tripping of High-Voltage Direct Current (HVDC) link between Thailand and Malaysia due to the fault in a thyristor room at Khlong Ngae converter station of Thailand side on July 22, 2005. The discrete wavelet decomposition and short-time Fourier Transform have been applied to analyze the characteristic of the inter-area oscillation between central and southern areas in both time and frequency domains. Analyzed results based on PMUs data are consistent with the actual tie-line power flow between both areas.
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    Robust decentralized design of H∞-based frequency stabilizer of SMES
    (2005-06-01)
    Vorakulpipat, C.
    ;
    Leelajindakrirerk, M.
    ;
    Ngamroo, I.
    This paper presents a new robust decentralized design of frequency stabilizer for superconducting magnetic energy storage (SMES) based on an H <inf>∞</inf> control. As an interconnected power system is subjected to load disturbances, system frequency may be severely disturbed and oscillate. To stabilize frequency oscillations, the active power control by SMES installed in a power system can be applied. The proposed decentralized control design translates interconnected power systems installed with SMESs into a Multi-Input Multi-Output (MIMO) control system. The technique of overlapping decompositions is applied to extract the decoupled subsystem with Single-Input Single-Output (SISO) from an MIMO system. As a result, a frequency stabilizer of SMES can be independently designed to enhance the damping of the inter-area mode embedded in the decoupled subsystem. In addition, to guarantee the robust stability of system against uncertainties such as system parameters variations etc., the multiplicative uncertainty model is also incorporated. Consequently, H <inf>∞</inf> control via a mixed sensitivity approach is applied to design the robust frequency stabilizer of SMES. Study results explicitly show that the robustness of the H<inf>∞</inf>-based frequency stabilizer of SMES is superior to that of the PID based stabilizer under various load disturbances and negative damping.