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Author: search.filters.author.Dechanupaprittha, SanchaiSubject: search.filters.subject.Power system stability

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    Design and analysis of robust SMES controller for stability enhancement of interconnected power system taking coil size into consideration
    (2009-01-01)
    Dechanupaprittha, Sanchai
    ;
    Sakamoto, Naotoshi
    ;
    Hongesombut, Komsan
    ;
    Watanabe, Masayuki
    ;
    Mitani, Yasunori
    In power applications, efficiency and effectiveness of SMES with proper control are promising and highly remarkable, however, quite costly. Accordingly, optimum design and utilization are essentially needed. This paper presents the design and analysis of robust SMES controller for stability enhancement of interconnected power system taking coil size into consideration. With lead/lag controller structure, parameters of robust SMES controller can be optimized by a metaheuristic method; meanwhile, a multiplicative uncertainty is included in the design to cope with system uncertainties. Lastly, aiming at achieving optimum design and utilization, robust controllers for SMES with different coil sizes are examined to investigate performance and robustness under different situations via simulation studies. © 2009 IEEE.
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    A practical design of a fuzzy SMES controller based on synchronized phasor measurement for interconnected power systems
    (2008-04-23)
    Dechanupaprittha, Sanchai
    ;
    Hongesombut, Komsan
    ;
    Watanabe, Masayuki
    ;
    Mitani, Yasunori
    ;
    Ngamroo, Issarachai
    Recently, fuzzy logic control has widely received attention in various power system applications, despite difficulties of obtaining its control rules and membership functions. Nowadays, power systems consist of multiple areas where load variations with abrupt changes always exist, and proper control rules and membership functions could hardly be achieved. This paper proposes a practical design of fuzzy logic controllers for superconducting magnetic energy storage (SMES) based on a wide area synchronized phasor measurement for enhancing the stability of an interconnected power system. Moreover, a heuristic method is applied for determining control rules and membership functions. The estimated model is determined via a simplified oscillation model for detection and assessment of an approximated inter-area oscillation mode. Finally, some simulation studies based on a two-area four-machine power system are carried out to examine the performance and effectiveness of the designed fuzzy SMES controller. Copyright 2008 The Berkeley Electronic Press. All rights reserved.
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    A practical design of fuzzy SMES controller based on synchronized phasor measurement for interconnected power system
    (2007-12-01)
    Dechanupaprittha, Sanchai
    ;
    Hongesombut, Komsan
    ;
    Watanabe, Masayuki
    ;
    Mitani, Yasunori
    ;
    Ngamroo, Issarachai
    Recently, fuzzy logic control has widely received attention in various power system applications, despite difficulties of obtaining its control rules and membership functions. Nowadays, power system consists of multiple areas where load variations with abrupt changes always exist, and proper control rules and membership functions could be hardly achieved. This paper proposes a practical design of fuzzy logic controllers for superconducting magnetic energy storage (SMES) based on wide area synchronized phasor measurement for improving stability of interconnected power system. Moreover, a heuristic method is applied for determining control rules and membership functions. The estimated model is determined via a coupled vibration model for detection and assessment of an approximated inter-area oscillation mode. Finally, some simulation studies based on a two-area four-machine power system are carried out to examine the performance and effectiveness of the designed fuzzy SMES controller. © 2007 RPS.
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    Test results of evaluating eigen-characteristics of interarea power swing mode derived from PMU data in Thailand system
    (2007-12-01)
    Higuma, Kenichiro
    ;
    Dechanupaprittha, Sanchai
    ;
    Morimoto, Hisayosi
    ;
    Watanabe, Masayuki
    ;
    Mitani, Yasunori
    The status of Thailand power system in northern, central and southern areas are monitored and collected by using multiple synchronized Phasor Measurement Units (PMUs). An analysis result of oscillation characteristics shows clearly that the power oscillation is observable at a frequency around 0.5Hz between central and southern areas. The power system stability is analyzed by determining eigenvalue from phase difference between central and southern areas. In this paper, the eigen-characteristics estimated from the PMU data in the steady state fluctuations have been confirmed by comparing the transient behaviour when a large disturbance occurred in the power system. Accordingly, methods of estimating eigenvalues from system data were examined. As a result, transitions of the stability could be estimated systematically using proposed methods.