The nonlinear characteristics diagnosis of the superheated steam temperature control system

The nonlinear characteristics is an important factor that influences the control system performance, it is a valuable work in the domain of control system performance monitor to diagnose the nonlinear characteristics and its scale of the control system. For the superheated steam temperature control system of the thermal power generation unit, this paper uses the bispectrum and the bicoherence of a stationary time series to form the non-Gaussian index(NGI) and the nonlinear index(NLI), and diagnoses the nonlinear characteristics and its scale in the control system. The results are shown to demonstrate its feasibility and validity by analyzing the MATLAB simulation data and the actual operation data.