Method of On-Line Transient Stability Assessment of Electrical Power Systems

摘要

In the past, in electrical power networks, the effects on thesystem of particular contingencies, such as interruption of a power line,have been modelled off-line. Such models have generally been overlyconservative, adding considerable cost to power systems. The presentinvention provides an on-line method of transient stability assessmentreferred to as the "second kick" method. It does this by providing acomputer model of the system, simulating a study contingency, measuringthe effect on the energy properties in the system of the study contingency,and if instability is indicated, calculating the transient energymargin from the corrected kinetic energy and, if the measured energyproperties indicate stability introducing an artificial contingency into themodel which is of sufficient duration to make this system unstable andmeasuring the transient energy margin as the difference between thecorrected kinetic energy after the artificial contingency and the minimumvalue of the corrected kinetic energy after the artificial contingency, aftercompensating for the potential energy change introduced into the systemby the artificial contingency.