Detecting electromechanical oscillations in power systems
First Claim
1. Method of detecting electromechanical oscillations in a power system, comprisinga) measuring repeatedly a system quantity of the power system and generating a series of measured values of the system quantity,b) estimating model parameters of a discrete-time model of the power system from said series,c) deducing frequency and damping of an electromechanical oscillation mode of the power system from the model parameters, wherein the method comprisesd) updating said model parameters every time a new value of the system quantity is measured.
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Abstract
The detection of electromechanical oscillations in power systems and the estimation of their frequency and damping parameters are based on a linear time-varying model. The parameters of the linear model are on-line adapted by means of Kalman filtering techniques to optimally approximate the measured signal representing the behavior of the power system based on a quadratic criterion. The estimated model parameters are then the basis for the calculation of parameters of the oscillations. Adaptive algorithms are based on a recursive calculation of the estimated parameter vector for each time-step based on the new value of the measured signal and the old values of the estimated parameters.
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Citations
10 Claims
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1. Method of detecting electromechanical oscillations in a power system, comprising
a) measuring repeatedly a system quantity of the power system and generating a series of measured values of the system quantity, b) estimating model parameters of a discrete-time model of the power system from said series, c) deducing frequency and damping of an electromechanical oscillation mode of the power system from the model parameters, wherein the method comprises d) updating said model parameters every time a new value of the system quantity is measured.
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9. An electric power transmission system including means for detecting electromechanical oscillations of the power system, comprising:
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a) means for repeatedly measuring a system quantity of the power system and generating a series of measured values of the system quantity, b) means for estimating, from said series, model parameters of a discrete-time model of the power system, c) means for deducing, from said model parameters, frequency and damping of an electromechanical oscillation mode of the power system, the means for detecting electromechanical oscillations of the power system comprising d) means for updating said model parameters every time a new value of the system quantity is measured.
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10. A computer-readable medium for detecting electromechanical oscillations in electric power transmission systems, the computer-readable medium containing programming instructions which are loadable into an internal memory of a digital computer, the programming instructions comprising computer program code means to make the computer execute the steps of:
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a) measuring repeatedly a system quantity of the power system and generating a series of measured values of the system quantity; b) estimating model parameters of a discrete-time model of the power system from said series; c) deducing frequency and damping of an electromechanical oscillation mode of the power system from the model parameters; and d) updating said model Parameters every time a new value of the system quantity is measured.
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Specification