Fluctuation Magnitude Calculation and Oscillation Probability Analysis of Tie-Line Active Power in Interconnected Power System

Abstract:

The historical data of wide area measurement system (WAMS) contains the daily record of the number of oscillations. The phenomenon, which the number of these oscillations suddenly increases at a certain frequency, indicates that the risk of weak damping oscillation with this frequency will increase. In other words, the statistical characteristics of these oscillations can reflect the system stability level. In this paper, the formulation of the small signal analysis including power disturbance on the power grid is given firstly. Then the relationship between the oscillation probability and damping ratio is obtained theoretically. Finally, a case study is carried out based on a 10-machine 39-bus power system. Simulation results verify the validity of the expression of oscillation amplitude of tie-line active power and the relationship between the oscillation probability and damping ratio. These theoretical results can be used to guide the power operator to assess the damping level of the power grid based on the daily number of oscillations recored by WAMS.

• Periodical: Advanced Materials Research (Volumes 1070-1072)
• Pages: 861-868
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1070-1072.861
• Online since: December 2014
• Authors: Hong Sheng Zhao, Wei Biao Chen, Jin Wang, Dong Jun Yang, Jing You Xu, Yuan Liu, Zi Quan Liu*
• Keywords: Low Frequency Oscillation (LFO), Oscillation Probability, Power System, Wide-Area Measurement System

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