Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Bagged Auto-Associative Kernel Regression-Based Fault Detection and Identification Approach for Steam Boilers in Thermal Power Plants

  • Yu, Jungwon (Dept. of Electrical and Computer Engineering, Pusan National University) ;
  • Jang, Jaeyel (Technology & Information Department, Technical Solution Center, Korea East-West Power Co., Ltd.) ;
  • Yoo, Jaeyeong (XEONET Co., Ltd) ;
  • Park, June Ho (Dept. of Electrical and Computer Engineering, Pusan National University) ;
  • Kim, Sungshin (Dept. of Electrical and Computer Engineering, Pusan National University)
  • Received : 2017.01.12
  • Accepted : 2017.04.04
  • Published : 2017.07.01
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Abstract

In complex and large-scale industries, properly designed fault detection and identification (FDI) systems considerably improve safety, reliability and availability of target processes. In thermal power plants (TPPs), generating units operate under very dangerous conditions; system failures can cause severe loss of life and property. In this paper, we propose a bagged auto-associative kernel regression (AAKR)-based FDI approach for steam boilers in TPPs. AAKR estimates new query vectors by online local modeling, and is suitable for TPPs operating under various load levels. By combining the bagging method, more stable and reliable estimations can be achieved, since the effects of random fluctuations decrease because of ensemble averaging. To validate performance, the proposed method and comparison methods (i.e., a clustering-based method and principal component analysis) are applied to failure data due to water wall tube leakage gathered from a 250 MW coal-fired TPP. Experimental results show that the proposed method fulfills reasonable false alarm rates and, at the same time, achieves better fault detection performance than the comparison methods. After performing fault detection, contribution analysis is carried out to identify fault variables; this helps operators to confirm the types of faults and efficiently take preventive actions.

Keywords

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