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Murilo E. C. Bento
Departamento de Engenharia Elétrica, Universidade Federal do Rio de Janeiro, RJ
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Tatiane C. C. Fernandes
Departamento de Engenharia Elétrica, Universidade Federal de São Carlos, SP
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Ahda P. Grilo-Pavani
Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, SP
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Rodrigo A. Ramos
Departamento de Engenharia Elétrica, Universidade de São Paulo, SP
Keywords:
Power System Stability, Electromechanical Modes, Signal Decomposition, Phasor Measurement Unit, Wide-Area Measurement Systems
Abstract
The knowledge of the electromechanical modes of the power system allows the operator to identify possible small-signal stability problems and to evaluate if the continuous supply of electrical energy may be compromised. This paper proposes a multistage algorithm to estimate electromechanical modes based on measurements of Phasor Measurement Units (PMU). At each stage, the algorithm determines a mode that minimizes the mean squared error with respect to the corresponding measured signal. Thus, the algorithm starts by estimating the first mode and each subsequent stage corresponds to the estimation of another mode. The algorithm converges when the error between the measured and the reconstructed signals is smaller than a pre-defined threshold. Case studies using real PMU measurements are presented and discussed, and illustrate the effectiveness of the application of the proposed algorithm.
