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US 2013/0158903 A1Published application
Method and System for Detecting Transients in Power Grids
AssigneeMitsubishi Electric Research
InventorsZafer Sahinoglu, Jianlin Guo, Xiufeng Song
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Abstract
Conditions in a power grid are detected by sampling a voltage in the grid. A normal condition hypothesis is modeled as a sinusoid, and a transient condition hypothesis is modeled as a sum of damped sinusoids. The samples are used to construct probability density function. A likelihood ratio based on the pdf and the hypotheses is compared to a threshold to determine whether the condition is normal or transient.
Claims9
A method for detecting a condition in a power grid, comprising the steps of:
- modeling a normal condition hypothesis as a sinusoid, and a transient condition hypothesis as a sum of damped sinusoids;
- constructing a probability density function (pdf) from voltage samples in the grid;
- and
- comparing a likelihood ratio based on the pdf and the hypotheses to a threshold to determine the condition, wherein the steps are performed in a processor.
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