Modelling of a water/steam cycle of the combined cycle power plant "Rio Bravo 2" with Modelica
Baligh El Hefni, Daniel Bouskela · 2006
In order to improve the performance of its simulation tools while reducing their cost, EDF is studying the interest and feasibility to replace LEDA, a tool developed and maintained by EDF for the modelling and simulation of the normal or incidental operation of nuclear and conventional thermal plants, by off-theshelf available tools. The combined cycle power plant “Rio Bravo 2” covers the important case of static studies. To test the capabilities of Modelica based tools to meet EDF needs for the modelling and simulation of such complex energy processes, the LEDA model of Rio Bravo 2 was translated from Fortran into Modelica and simulated using the commercial tool Dymola. A library of fully static 0D thermalhydraulics component models was built. Each component is the complete translation of a LEDA model. The full model was built by connecting the component models in a technological way, so that its topology reflects the functional schema of the plant. A preliminary calibration of the model was made against measurement data obtained from on-site sensors using inverse calculations. The model was then able to compute precisely the distribution of the steam/water mass flow rates, pressure and temperature across the network, the exchangers thermal power, and the performance parameters of all the equipments. It converges very quickly, provided that the iteration variables are properly fed in by the user. The results are remarkably close to the LEDA reference.