Root Cause Diagnosis of Plant Wide Oscillations using Kernel Granger Causality

Plant wide oscillations are very common in industrial processes. When a control unit oscillates in the process, the oscillation will propagate through the connectivity between units, which will cause problems such as poor product quality and higher energy consumption. Therefore, it is very important to diagnose the root cause of plant wide oscillations [1]. In this dissertation, the kernel Granger causality is proposed for root cause diagnosis, which effectively solves the problem that the linear Granger causality cannot deal with nonlinear data. A small nonlinear numerical example shows the validity of kernel Granger causality. In the root cause diagnosis of industrial cases, the method also successfully detected the correct root point (LC2).