Abstract
An ultra high voltage (UHV) AC tie line that connects North China and Central China power grid has been put into operation in 2009. This paper presents a method to calculate the peak value of active power oscillation of the UHV AC tie line following power shortage disturbance. The typical process of the oscillation on the UHV AC line is analyzed. It is shown that the active power oscillation on tie line of week connection grid is similar with the step response of the second-order system. The oscillation peak value is closely related to fault location, system inertia, and system inter-area damping. The method and analysis are tested in China system.KeywordsUHV AC tie lineOscillationWeek connection systemOscillation peak value
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