Modelling and loads and control analysis of the P80 FPP floating and semi-submersible power plant
Tutor / director / evaluatorVan Wunnik, Lucas Philippe
CovenanteeDanmarks tekniske universitet
Document typeMaster thesis
Rights accessRestricted access - author's decision
Due to the increasing offshore wind market and with the necessity of reaching zones with high water depths, special focus has been put over the recent years on developing floating wind concepts that will potentially become more attractive for certain water depths. In this master thesis, the P80 floating and semi-submersible power plant from FPP is modelled with the aeroelastic and non-linear time domain tool HAWC2, and the WAMIT interface (ESYSWamit) is used to read the hydrodynamic inputs of the floater. A first validation without the wind influence and with a 5MW turbine is carried out against the results from an hydrodynamic software and the in-house model of FPP. After that, an 8MW turbine is included in the model to perform a coupled wind and wave analysis of the system. The tuning of the DTU Wind controller  in order to be suitable for the floating P80 device as well as the study of the mooring system, are also included in the scope of this report. Finally, three load cases, two with power production and one parked in storm conditions are performed. The results show that the HACW2 model of the P80 device is achieving the same results given for comparison, after a modification in the Morison drag implementation, more suitable for noncylindrical shapes. Moreover, under the assumptions and limitations of the model implemented, the system motions are stable for all the design load cases, with only the tower top acceleration in the for-aft direction exceeding the assumed limitations in a very small percent of the time. The turbine performance appears to be correct, with no undesired couplings with the floater motions, which is also reflected in the bending moments statistics and the design equivalent loads.