A new open source Modelica library called "Ther-moSysPro" has been developed within the framework of the ITEA 2 EUROSYSLIB project. This library has been mainly designed for the static and dynamic modeling of power plants, but can also be used for other energy systems such as industrial processes, buildings, etc.To that end, the library contains over 100 0D/1D model components such as heat exchangers, steam and gas turbines, compressors, pumps, drums, tanks, volumes, valves, pipes, furnaces, combustion chambers, etc. In particular, one and two-phase water/steam flow, as well as flue gases flow are handled. The library has been validated against several testcases belonging to all the main domains of power plant modeling, namely the nuclear, thermal, biomass and solar domains. The paper describes first the structure library. Then the test-case belonging to the thermal domain is presented. It is the dynamic model of a combined cycle power plant, whose objective is to study a step variation load from 100% to 50% and a full gas turbine trip. The structure of the model, the parameterization data, the results of simulation runs and the difficulties encountered are presented.
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