Date de publication
11/01/18
Type de contrat
Autre
Fonction
Etudes/ R&D / Qualité
Société
Université de Picardie Jules Verne
Localisation
Amiens / France / Picardie
Secteur(s)
Ingénierie
Contact

Description du poste

PhD position which just opened on “Diagnostic and fault tolerant control of a 6-phase generator for wind turbines”

Description du profil

Any Indonesian Master holder is welcome to apply
The offer is proposed by Professor Franck Betin of Université Jules Verne de Picardie.

Applications are to be sent directly to him: franck.betin@u-picardie.fr

-----------------------

Thesis Subject
Diagnostic and fault tolerant control of a 6-phase generator
for wind turbines
The European Council has decided that 20% of the energy will be provided from renewable
ones in 2020 such as wind, solar or biomass. Nevertheless, few of them are available to produce
energy at a large scale to substitute nuclear or fossil production. At this time, one of the best solution
is the production of electrical energy using wind turbines and therefore France and especially the
North of the France has decided to go ahead with this solution.
Nevertheless, contrary to a standard plant with a huge generator, wind turbines are spread over
large areas through several generators and therefore their maintenance is a great challenge in such a
way to minimize costs and increase viability. Indeed, on embedded wind turbine generators, most of
mechanical failures come from the gearbox while most of electrical failures come from the converter
arms or the machine windings.
The electrical research team of the Laboratory of Innovative Technologies works on different
solutions to cope with this faults that induce the wind turbine breakdown.
To reduce the mechanical failures, the generators are built around high number of poles.
Therefore, the rated speed of the generator is equivalent to the blades speed and the gearbox can be
eliminated. To reduce the electrical faults, the generator stator and rotor are 6-phase ones and, in this
way, the electrical production can continue when up to 3 phases are remaining on the converter or on
the machine. Nevertheless, when one to three phases are missing, the control algorithms have to be
updated in such a way to take into account the fault and eliminate induced power ripples.
A test bed (see Fig. 1) has been realized in the laboratory to test different control strategies for a
wind turbine based on a multiphase generator. It is built around :
- A classical 45 kW induction motor simulating the rotor low speed of a wind turbine,
- A low speed (125rpm, 24 kW) 6-phase induction generator (6PIG) with high number of poles
(24),
- A low speed (125rpm, 24 kW)) 6-phase synchronous generator (6PSG),
- A gearbox 125/3000 rpm,
- A 6-phase induction generator (3000rpm),
- A back to back converter allowing electricity injection on national french grid.
This subject follows two previous thesis focused on the modelization and the control of the 6PIG.
Now, the main goal will be to improve the work realized by M. Mehdi Taherzadeh (2015) and M. Alin
Pantea (2017) on switching between different control rules depending on the fault. The Phd student
would have to keep in mind to provide a control strategy as close as possible from industrial ones to
facilitate the creation of a partnership with industry. Furthermore, other goals of the thesis are to :
- minimize the losses inside the machine,
- increase the rated power,
- improve the switching dynamics after a fault detection.

The Phd student will start by making the state of art on wind turbine energy production and
control of multiphase machines. The aim is to find control strategies that can cope with electrical
faults such as losses of inverter arms or machine windings. Then, he will at first test in simulation
different fault tolerant control strategies and then he will implement in real time the most suitable ones
on the experimental test bed (Fig. 1).
Contact : Franck Betin, 15 avenue François Mitterrand, 02880 Cuffies, France, franck.betin@upicardie.fr