Wavelet analysis method of harmonics and electromagnetic interference in coal mines

In this study we propose an analytical method based on orthogonal wavelet transforms for detecting harmonic noise and Electromagnetic Interference (EMI) from power supply systems and equipment in coal mines. The method will separate interference from signals through wavelet packet decomposition and then accomplish wavelet packet synthesis towards decomposition results after filtering, to remove harmonic noise and electromagnetic interference. Detailed simulation experiments are presented to study power harmonics and Electrical Fast Transient Burst (EFT/B) interference and to validate the effectiveness of our proposed method. The experimental results show that the proposed method, suitable for mutant and non-stationary signal detection, can accurately analyze harmonic interference and EMI in coal mines, as well as establish EMI source models and perform underground Electromagnetic Compatibility (EMC) prediction analyses.

[1]  P. Delogne,et al.  EM propagation in tunnels , 1991 .

[2]  Ma Feng-ying.  A Study of Electromagnetic Interference Characteristic in Coal Mine Based on Wavelet Analysis , 2007 .

[3]  Chen Li,et al.  Improved complex filter applied in enhancing EFT/B immunity at a coal mine monitoring substation , 2008 .

[4]  Xi Chen,et al.  A Novel Fractal Wavelet Image Compression Approach , 2007 .

[5]  Ali N. Akansu,et al.  On-signal decomposition techniques , 1991 .

[6]  Feng-ying Ma,et al.  Improved wavelet analysis in enhancing Electromagnetic Campatibility of underground monitoring system in coal mine , 2008 .

[7]  Ma Fengying,et al.  Improving Immunity of Colliery Mobile Communication and Gas Monitor to Underground Haulage Motors Electromagnetic Interference , 2007, 2007 IEEE International Conference on Automation and Logistics.

[8]  Kannan Ramchandran,et al.  Best wavelet packet bases using rate-distortion criteria , 1992, [Proceedings] 1992 IEEE International Symposium on Circuits and Systems.

[9]  Jianda Han,et al.  Application of wavelets transform to fault detection in rotorcraft UAV sensor failure , 2007 .

[10]  Ji-ping Sun,et al.  Improved shielding and filtering applied to immunity enhancement of underground gas sensors , 2008 .

[11]  Tian Zi-jian,et al.  Study on electromagnetic compatibility in coal mine , 2006 .

[12]  Clayton R. Paul,et al.  Introduction to electromagnetic fields , 1982 .

[13]  Guangguo Bi,et al.  Adaptive wavelet packet transform-based narrowband interference canceller in DSSS systems , 1997 .

[14]  L. B. Milstein,et al.  Interference rejection techniques in spread spectrum communications , 1988, Proc. IEEE.