Application of ITD and Random Decrement Method in Oscillation Characteristics Analysis of Interconnected Power Grid

doi:10.3969/j.issn.1000－7229.2014.01.002

Abstract

Abstract:

Timely and accurate information of weakly-damped low-frequency oscillation characteristics is important to the stable operation of system. Ibrahim Time Domain （ITD） and random decrement method were proposed to processing wide area measurement signal and systematically study the oscillation characteristics of power system. Based on the basic principle introduction of this method, the power spectral properties of different types of signals measured in China Southern Power Grid （CSG） were compared, and the definition of ambient signal was presented. Then this approach was applied to the simulation data from the 36-node system and the measured data in CSG, in order to grasp the dynamic characteristics of the interconnected power grid from typical signals, realize the characteristic parameters identification of low-frequency oscillation in power system, which could lay a solid foundation for the timely and accurate grasp of the dynamic characteristics of interconnected power system based on wide area measurement signal.

Key words: oscillation characteristics, wide area measurement signal, ITD method, random decrement method, ambient signal

WU Chao， MEN Kun, TU Liang. Application of ITD and Random Decrement Method in Oscillation Characteristics Analysis of Interconnected Power Grid[J]. ELECTRIC POWER CONSTRUCTION, 2014, 35(1): 8-13.

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