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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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    Detection of power system oscillations using synchronized phasor measurement units through home power outlets
    (2006-12-01)
    Ngamroo, I.
    ;
    Mitani, Y.
    ;
    Dechanupaprittha, S.
    ;
    Hongesombut, K.
    ;
    Jintakosonwit, P.
    This paper deals with a detection system of the inter-area oscillation between central and southern areas of Thailand power system using GPS-based synchronized phasor measurement units (PMUs). The PMUs are installed at two universities representing both areas. The phasor data of a single phase voltage 220 V are measured by PMU via power outlet. The proposed system not only requires low capital cost but uses internet for data transmission. The wavelet decomposition and least-squares error are applied to identify the eigenvalue corresponding to inter-area mode.