PhD Proposal
Years 2014-2017
Arts et Métiers ParisTech – Campus of Lille
L2EP – Laboratory of Electrical Engineering of Lille – http://l2ep.univ-lille1.fr/index2.php
Supervisor of the PhD Thesis:
Dr. HdR. Xavier KESTELYN
E-mail:
Xavier.Kestelyn@ensam.eu
Phone number:
+33 (0)3 20 62 22 38
Associate supervisor:
E-mail:
Phone number:
Title:
Keywords:
Direct Control of multi-phase electrical drives working closed to their limits
Multi-phase electrical
machines
Space-vector control
Flux-weakening
operations and antiwinding schemes.
Expected student profile:
Master in Electrical Engineering with skills in Automatic control or Master in Automatic control with
skills in Electrical Engineering.
Context, objectives and expected results:
The electrical drives are more and more used with embedded applications (automotive, aeronautics,
space, …) in place of conventional motorizations. The specific constraints imposed to the volume and power of
such systems lead to optimize the utilization of all components of the electric power train. The rated functioning
zones are then shifted towards their limits, which induces specific non-linear behaviors (quasi permanent
reaching of voltage and current limitations, magnetic saturation, …). Finally, the necessity of fault tolerant
characteristics associated to cost constraints leads to the choice of intrinsic fault-tolerant systems, avoiding then
the use of several identical systems. This context leads to the use of multi-phase inverter-machine systems
(having more than three phases) working in areas that are closed to their physical limits.
The control of such systems imposes a fine modeling and the use of specific strategies making possible
to limit the physical variables along an optimized use of them (anti-winding, flux-weakening, space-vector
modulation, …). If the system works far from its limits it is possible to decompose the system into several
fictitious systems that are independently controlled. In the case of a system working close to its limits, it is no
more possible and a direct control of the whole system is necessary.
Some laboratories work on this field of research and collaborations have already been initiated with
Liverpool (LJMU) and Malaga (UMA) universities. Even if some strategies have been proposed in the literature,
it has been observed that there are all based on strong assumptions and do not make possible to get the optimal
performances of the controlled systems. The vectorial formalism for modeling and control multiphase systems,
which has been developed at the L2EP, is very well-adapted to tackle with the proposed challenges.
This project comes after P.Sandulescu’s and L.Lu’s PhD works, made in collaboration with Valeo
company. The aim of the PhD work is to accurately model multi-phase systems and to develop direct controls,
which make possible to optimize the performances of such systems working close to their limits.
Finally, three-phase, five-phase and seven-phase machines with their supplies (Multi-leg Inverters) and
control systems (DSPACE and OPAL-RT) are present at our laboratory in order to validate strategies that will be
developed during the PhD work.
References:
[1] Control Strategies for Open-End Winding Drives Operating in the Flux-Weakening Region, IEEE
Transactions on Power Electronics, 9-2013, Alexandru-Paul SANDULESCU, Fabien MEINGUET, Xavier
KESTELYN, Eric SEMAIL, Antoine BRUYERE
[2] Flux-weakening operation of open-end winding drive integrating a cost effective high-power charger, IET Electrical Systems in Transportation, Vol. 3, N°. 1, pages. 10 - 21, ISBN2042-97383-2013, Alexandru-Paul
SANDULESCU, Fabien MEINGUET, Xavier KESTELYN, Eric SEMAIL, Antoine BRUYERE
[3] A Vectorial Approach for Generation of Optimal Current References for Multiphase Permanent Magnet
Synchronous Machines in Real-time, IEEE Transactions on Industrial Electronics, Vol. 58, N°. 11, pages. 5057 5065, ISBN0278-00462-2011, Xavier KESTELYN, Eric SEMAIL
[4] FPGA Implementation of a General Space Vector Approach on a 6-Leg Voltage Source Inverter
IECON 2011 - IEEE International Conference On Industrial Applications of Electronics, N°. 37, pages. 34823487, ISBN978-1-61284-969-09-2011, Alexandru-Paul SANDULESCU, Lahoucine IDKHAJINE, Sebastien
CENSE, Frédéric COLAS, Xavier KESTELYN, Eric SEMAIL, Antoine BRUYERE
[5] Flux-Weakening Strategies for a Five-Phase PM Synchronous Machine, EPE2011, 9-2011, Li LU, Eric
SEMAIL, Luc KOBYLANSKI, Xavier KESTELYN
6] Parsa, L.; Namhun Kim; Toliyat, H.A.; , "Field Weakening Operation of High Torque Density Five-Phase
Permanent Magnet Motor Drives," Electric Machines and Drives, 2005 IEEE International Conference on , vol.,
no., pp.1507-1512, 15-15 May 2005
[7] M.R. Arahal, F. Barrero, S. Toral, M.J. Durán, R. Gregor, “Multi–phase current control using finite–state
model–predictive control,” Control Engineering Practice, vol. 17, no. 5, pp. 579–587, 2009.
[8] F. Barrero, J. Prieto, E. Levi, R. Gregor, S. Toral, M. Duran, M. Jones, “An Enhanced Predictive Current
Control Method for Asymmetrical Six–phase Motor Drives,” IEEE Transactions on Industrial Electronics, vol.
58, no. 8, pp. 3242-3252, 2011.
[9] Song Xuelei, Wen Xuhui, Cong Wei, "Research on field-weakening control of multiphase permanent magnet
synchronous motor", Electrical Machines and Systems (ICEMS), 2011 International Conference on, On page(s):
1–5
[10] Riveros, J.; Barrero, F.; Levi, E.; Duran, M.; Toral, S.; Jones, M., "Variable-Speed Five-Phase Induction
Motor Drive Based on Predictive Torque Control," Industrial Electronics, IEEE Transactions on , vol.60, no.8,
pp.2957-2968, to be published in 2013.
Figure 1 : Experimental setups developed for works on multiphase drives. "SOFRACI-Valeo" and "MHYGALEValeo" facilities.