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Tesi etd-09102018-122252


Thesis type
Tesi di laurea magistrale
Author
BECCACECE, ALESSIO
URN
etd-09102018-122252
Title
Modelling, Analysis and Control of Offshore Wind Generation Systems
Struttura
INGEGNERIA DELL'ENERGIA, DEI SISTEMI, DEL TERRITORIO E DELLE COSTRUZIONI
Corso di studi
INGEGNERIA ELETTRICA
Supervisors
relatore Prof. Bolognesi, Paolo
correlatore Dott.ssa Biagini, Veronica
correlatore Dott. Biskoping, Matthias
Parole chiave
  • electric generator control
  • wind farm
  • DC wind turbine
Data inizio appello
28/09/2018;
Consultabilità
Secretata d'ufficio
Riassunto analitico
Countries all around the world are setting new targets, on renewable energy, to be
achieved in the coming years. Europe is proceeding in line with its 2020 targets,
and current discussion within EU indicate that the overall renewable targets
could be raised to 35% by 2030. Due to this there is still a great need around the
world for new power generation, which is clean, a ordable, reliable and quick to
install. Wind power is leading the transition away from fossil fuels and continues
to blow away the competition on price, performance and reliability. The industry
is maturing really fast, especially the o shore sector. O shore prices for projects
to be completed in the next ve years or so are half of what they were for the last
ve years, installations in 2017 almost doubled the one in 2016 marking a record
year for the o shore wind industry.
This thesis, developed in collaboration with the ABB Corporate Research
Center in Ladenburg (Germany), deals with the analysis of an innovative o shore
wind farm con guration based on a DC grid. First the state of art and the
di erent o shore wind farm topologies were introduced, then the system analysed
in the thesis was presented and discussed in details through software modelling
and simulations.
Chapter 2 shows how the main components of the system were modelled using
the PLECS software. A detailed description of all components was provided, with
equations and models.
The control system was designed and modelled using the reference feedforward
technique because it has several advantages compare to the classical feedback
con guration. It was implemented in Matlab/Simulink how shown in Chapter 3.
The cable length was designed to avoid resonances in the interconnection
cable between the wind turbine and the o shore substation. Investigating the
in
uence of the control parameters a new way to avoid resonances was found,
which is changing the gains of the PI controller.
In the end, simulations results are shown and discussed in details to demon-
strate the e ectiveness of the analysed system and of the adopted designing
method.
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