Method of on-line transient stability assessment of...

H - Electricity – 02 – J

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H02J 3/24 (2006.01) G06F 15/56 (1990.01)

Patent

CA 2128125

In the past, in electrical power networks, the effects on the system of particular contingencies, such as interruption of a power line, have been modelled off-line. Such models have generally been overly conservative, adding considerable cost to power systems. The present invention provides an on-line method of transient stability assessment referred to as the "second kick" method. It does this by providing a computer model of the system, simulating a study contingency, measuring the effect on the energy properties in the system of the study contingency, and if instability is indicated, calculating the transient energy margin from the corrected kinetic energy and, if the measured energy properties indicate stability introducing an artificial contingency into the model which is of sufficient duration to make this system unstable and measuring the transient energy margin as the difference between the corrected kinetic energy after the artificial contingency and the minimum value of the corrected kinetic energy after the artificial contingency, after compensating for the potential energy change introduced into the system by the artificial contingency.

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