The thermodynamic process in thermal power plants boasts features of non-liearity

large inertia

and long time delay.By using cluster analysis method in Euro-mode spectrum system

the performance of thermodynamic process has been divided

and the nonlinearity of thermodynamic process having been turned into a problem of linearization at some performance points

and the time stamps being introduced into the data matrix of cluster analysis.The results in identification of set value for coal feed and main steam pressure while using modified differential evolution method show that the cluster analysis can enhance the rationality of performance division in model identification

and making the load to be relatively stable under stepped disturbance of the coal feed set value

but difference still exists in model parameters obtained from identification according to the test data.