Subspace Method based Dynamic Model Identification of the 600MW supercritical once-through boiler

As a kind of identification algorithm, the subspace identification method has attracted more and more researchers' attention, which has the advantages of fast computing, without parameterizing, and so on. This paper analyzes a kind of subspace identification algorithm based on principle component analysis,and uses it to identify the dynamic model of the 600MW supercritical once-through boiler. For the No. 1 supercritical once-through boiler of a power plant, we choose the main input and output data as the identification data. The identification results show the once-through boiler dynamic response are accordant with the practical process, the method is feasible and the model is useful in the thermal control system.