Importance

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Abstract

In the past, in electrical power networks, the effects on the system of particular contingencies, such as a given power line being interrupted, have been modelled off-line, so that the proper response to that contingency can be planned ahead of time and acted upon quickly in the event of such contingency. Such models have generally been overly conservative adding considerable cost to power systems. The present invention provides a method of predicting the transfer limit or the amount of remedial action required to maintain stability of a power system in the event of a study contingency by determining a transient energy margin, comprising the steps of: a) providing a computer model of the system; b) simulating the study contingency using a step by step time integration method; c) measuring the effect on the energy properties in the system which resulted from the study contingency, and if the measured energy properties indicate instability, calculating the transient energy margin from the corrected kinetic energy; and d) if the measured energy properties indicate stability, introducing an artificial contingency into the model which is of sufficient duration to make the 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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First Claim