Application of phase-locked loop (PLL) in oscillation monitoring for interconnected power systems
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United States of America Patent
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Jun 25, 2013
Grant Date -
Apr 4, 2013
app pub date -
Oct 25, 2011
filing date -
Sep 29, 2011
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Abstract
The present invention relates to a method for accurately detecting oscillations and improving stability of power systems. The method includes the steps of providing a phase-locked loop having a phase detector, a loop filter, and a number-controlled oscillator. The method further includes the steps of extracting an input signal from the power system, using the phase-locked loop to track the frequency and phase of a targeted mode in the input signal, and creating a locally generated reference signal to fit the input signal and to allow the input signal's modal information to be obtained. The method further includes the step of performing mode shape analysis utilizing the reference phase signals constructed from the tracked frequencies.
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