Simultaneous Estimation of Electromechanical Modes and Forced Oscillations

Over the past several years, great strides have been made in the effort to monitor the small-signal stability of power systems. These efforts focus on estimating electromechanical modes, which are a property of the system that dictate how generators in different parts of the system exchange energy....

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Veröffentlicht in:IEEE transactions on power systems 2017-09, Vol.32 (5), p.3958-3967
Hauptverfasser: Follum, Jim, Pierre, John W., Martin, Russell
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Pierre, John W.
Martin, Russell
description Over the past several years, great strides have been made in the effort to monitor the small-signal stability of power systems. These efforts focus on estimating electromechanical modes, which are a property of the system that dictate how generators in different parts of the system exchange energy. Though the algorithms designed for this task are powerful and important for reliable operation of the power system, they are susceptible to severe bias when forced oscillations are present in the system. Forced oscillations are fundamentally different from electromechanical oscillations in that they are the result of a rogue input to the system, rather than a property of the system itself. To address the presence of forced oscillations, the frequently used AutoRegressive Moving Average (ARMA) model is adapted to include sinusoidal inputs, resulting in the AutoRegressive Moving Average plus Sinusoid (ARMA+S) model. From this model, a new Two-Stage Least Squares algorithm is derived to incorporate the forced oscillations, thereby enabling the simultaneous estimation of the electromechanical modes and the amplitude and phase of the forced oscillations. The method is validated using simulated power system data as well as data obtained from the western North American power system and Eastern Interconnection.
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subjects Auto-regressive models
Autoregressive moving average
Autoregressive processes
Computer simulation
Electricity distribution
Electromechanical modes
Forced oscillations
Generators
Least squares
Mathematical model
Monitoring
Oscillations
Oscillators
phasor measurement unit (PMU)
Phasor Measurement Units (PMUs)
Power
Power system dynamics
Power system stability
Signal processing algorithms
Spectral analysis
Stability analysis
title Simultaneous Estimation of Electromechanical Modes and Forced Oscillations
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