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A new parity space approach for fault detection based on stationary wavelet transform

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3 Author(s)
Hao Ye ; Dept. of Autom., Tsinghua Univ., Beijing, China ; Guizeng Wang ; Ding, S.X.

In the traditional parity relation based fault detection approach, a lower order parity vector means a simpler online realization but a poorer performance index, while a higher order parity vector brings a better performance index but leads to a higher computational load and a higher rate of misdetection. In this note, by introducing the so-called stationary wavelet transform into the residual signal, a new kind of parity relation based residual generator and the corresponding optimization approach are proposed. The residual generator of the new approach can ensure a good performance index, a satisfactory low misdetection rate and a suitable response speed to faults with a low order parity vector and a simple online implementation form. The method is compared with three existing parity relation based approaches.

Published in:

Automatic Control, IEEE Transactions on  (Volume:49 ,  Issue: 2 )