Apparatus and method for out-of-step protection using the analysis of trajectories of electrical measurements in state plane

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United States of America Patent

PATENT NO 9529057
APP PUB NO 20140032138A1
SERIAL NO

13949629

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Abstract

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Various embodiments are described herein for a device and method for predicting an out-of-step or transient instability condition in a power system due to a disturbance, such as a fault, where the power system comprises a power generator. The method comprises determining values for a state plane trajectory for the power generator during the disturbance based on using an internal voltage angle of the power generator or an equivalent power generator and a during fault rotor speed of the power generator or equivalent power generator as state variables, determining time scale values; determining values for a critical state plane trajectory for the power generator after clearing the fault, determining values for a state plane trajectory for the power generator after clearing the fault, determining a critical clearing angle and a critical clearing time, and predicting that the power generator will be stable or unstable by comparing the time to clear the fault with the critical clearing time.

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Patent Owner(s)

Patent OwnerAddress
UNIVERSITY OF SASKATCHEWAN15 INNOVATION BOULEVARD SUITE 250 SASKATOON S7N 2X8

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gokaraju, Ramakrishna Saskatoon, CA 3 30
Shrestha, Binod Regina, CA 5 30

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