Determination of weak transmission links by cluster analysis

Date

2009

Author

Ertuğrul, Hamza Oğuz

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Due to faults and switching, transmission lines encounter power oscillations referred as power swings. Although in most cases they do not lead to an eventual instability, severe changes in power flows on the lines may cause the operation of impedance relays incorrectly, leading to cascaded tripping of other lines. Out-of-Step tripping function is employed in modern distance relays to distinguish such an unstable swing but setting the parameters and deciding lines to be tripped require detailed dynamic power system modelling and analysis. The proposed method aims to determine possible out-of-step (OOS) locations on a power system without performing detailed dynamic simulations. Method presented here, is based on grouping of the buses by statistical clustering analysis of the network impedance matrix. Inter-cluster lines are shown to be more vulnerable to give rise to OOS as proven with dynamic simulations on IEEE 39 bus test system.

Subject Keywords

Electrical engineering., Distribution or Transmission of Electric Power.

URI

http://etd.lib.metu.edu.tr/upload/3/12611236/index.pdf
https://hdl.handle.net/11511/19091

Collections

Graduate School of Natural and Applied Sciences, Thesis