Finding direction of oscillation propagation using non-parametric transfer entropy method

Disturbances in process plants may usually widely propagate because of the interconnection in process equipment. It is necessary to get the correct source of loop oscillations. The application of transfer entropy method has now been proved effective. These existing methods need too much process knowledge and the results are affected by different parameters. In this work, spectral independent component analysis (Spectral ICA) are used to select the oscillatory process loop variables and reduce the number of variables which need to be analyzed by transfer entropy method, then a normalized transfer entropy method with non-parametric is used to isolate the root-cause of plant-wide and identify the propagation paths. The successful application of the methods has been demonstrated through two cases.