Program Development And Estimation Of The Switching Over-voltage Of No-load Transmission Line During The Black Start Of Power System

Black start is the restoration process after blackout of the entire power system. Duringthis process, by choosing the right path quickly to get rid of over-voltage with high peakvalue，we could make sure that black start is quick and safe. Among those kinds ofover-voltage, the one caused by the energization of no-load (or light load) lines is veryimportant which needs our attention. So this kind of switching over-voltage is investigatedin the following:A computer program using mathematical models established in the process of theblack start is developed for computation and statistical evaluation of the over-voltages inblack-start.In order to shorten the calculating time of statistical over-voltages, this paper proposesa method based on the artificial neural network and vector machine to carry out the fastdetermination of over-voltage.The comparison between the results obtained above with those of EMTP shows thatthe developing program is trustful with high accuracy; meanwhile, these two intelligentalgorithms can determine the over-voltages quickly and correctly which can satisfy theevaluation requirement of the switching over-voltages existed in the process of the blackstart.