Root Cause Diagnosis of Plant-Wide Oscillation Using Spectral Granger Causality Based on Phase Resampling Test

Plant-wide oscillation is very common in industrial process. When an oscillation occurs in a control unit during the process, the oscillation will propagate through the connectivity between the units which will cause problems such as poor product quality and high cost. Therefore, root cause diagnosis of plant-wide oscillation is very important. This paper applies the spectral Granger causality based on phase resampling test for root cause diagnosis in the plant-wide oscillation. Phase resampling test is a new method of statistical significance test. A numerical example demonstrates the effectiveness of the phase resampling test. Moreover, an industrial application case study is shown to demonstrate the feasibility of the proposed method.