Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Application of HHT for Online Detection of Inter-Area Short Circuits of Rotor Windings of Turbo-Generators Based on the Thermodynamics Modeling Method

  • Wang, Liguo (Dept. of Electrical Engineering, Harbin Institute of Technology) ;
  • Wang, Yi (School of Mechanical Engineering and Automation, Harbin Institute of Technology) ;
  • Xu, Dianguo (Dept. of Electrical Engineering, Harbin Institute of Technology) ;
  • Fang, Bo (Dept. of Aerospace Engineering and Mechanics, Harbin Institute of Technology) ;
  • Liu, Qinghe (Design Departments, Harbin Electric Machinery Co. Ltd.) ;
  • Zou, Jing (Dept. of Electrical Engineering, Harbin Institute of Technology)
  • Received : 2010.08.26
  • Published : 2011.09.20
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Abstract

This paper focuses on monitoring and predicting the short circuit faults of the rotor windings of large turbo-generator systems. For the purpose of increasing efficiency and decreasing maintenance cost, a method that combines the HHT (Hilbert Huang Transform) with a wavelet has been studied. This method is based on analyzing a classical Albright detecting coil. Due to the Empirical Mode Decomposition (EMD) and the Intrinsic Mode Functions (IMF) of the HHT the exact location of a short circuit of rotor windings may be given. However, a part of the useful information is eliminated by the unreasonable decomposing scale of the wavelet. Based on the thermodynamics modeling method, this study was illustrated with a 50MW turbo-generator system that is installed in Northern China. The analysis results, which have very good agreement with those of a previous study, show that the method of combining the HHT with a wavelet is an effective way to analyze and predict the short circuit faults of the rotor windings of large generators, such as supercritical turbo-generator systems and wind turbo-generator systems. This work can offer a useful reference for analyzing smart grids by improving the power quality of a distribution network that is supplied by a turbo-generator system.

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References

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