Application of improved multivariate empirical mode decomposition to plant-wide oscillations characterization

A novel time domain method based on improved multivariate empirical mode decomposition (MEMD) for plant-wide oscillations characterization is proposed. The original MEMD is ameliorated in the following aspects, (i) decorrelation of the two-dimensional Halton sequences, (ii) boundary processing to restrain end effect and (iii) improved criterion for sifting process stoppage. Due to its capability to analyze multiple channels data, MEMD is especially suitable for characterizing plant-wide control loop oscillations. Simulation examples and industrial case study are provided to demonstrate the effectiveness of the proposed MEMD based approach.