Investigation on a new methodology for thermal power plant assessment through live diagnosis monitoring of selected process parameters; application to a case study

► We model a new method for short- and-long-term assessment in thermal power plants. ► It is based on automatic multivariate detection of different steady states. ► We supply improved deviations from a reference system of operation's performance. ► We provide a comprehensive application to highlight the achievements mentioned. ► The study deals with the long term mode, associating deviations to possible causes.