Doctors Group: IEEE Conference on Electrical Systems Control

Program of the MACS-SEEDS Inter GDR group day : CSE Electrical Systems Control Morning 10h - 12h 45 10h15 -11H : Title : Modeling and control of permanent magnet motors with magnetic saturations Authors : Al Kassem Jebai, François Malrait, Philippe Martin and Pierre Rouchon, Mines ParisTech. Abstract: Permanent Magnet Synchronous Motors (PMSM) are widely used in industrial applications thanks to their high efficiency. To control these motors, rotor position estimation is necessary, especially at low speeds where there is a theoretical observability problem. Over the past twenty years, several strategies for estimating position from electrical signals (current and voltage) have been developed. These methods are based on the motor's mathematical model or on the addition of high-frequency signals. However, non-linear phenomena such as magnetic saturation introduce errors into the estimated position, especially at low speeds. These errors degrade controller performance and can lead to motor instability. A mathematical model of the PMSM motor is presented, which takes into account the non-linear effects of magnetic saturation. This model is based on an energy formulation. In effect, the motor's magnetic energy is modified by adding saturation parameters. This model has been validated experimentally. It explains and compensates for motor position estimation errors due to magnetic saturation. This work is part of a thesis with Schneider Toshiba Inverter Europe (STIE). 11:00 - 11:45: Title: A Dynamic Router for Energy Management Applications with Non-negligible Dissipation: Theory and Experimental Results Authors: Víctor M. Ramírez, R. Ortega, L2S. Abstract: Efficient regulation of the energy transfer between generating, storage and load subsystems is a topic of current practical interest. A new strategy to achieve this objective, together with its corresponding power electronics implementation, was recently proposed by the authors. The device is called dynamic energy router (DER) because, in contrast with current practice, the regulation of the direction and rate of change of the power flow is done without relying on steady state considerations. A key assumption for the correct operation of the DER is that dissipation in the system is negligible. Unfortunately, in the presence of dissipation the original DER ceases to be operational. In this paper a new DER that takes into account the presence of losses is proposed. Simulation and experimental evidence of the performance improvement with the new DER are presented. 11:45 - 12:30: Title: Modified large-gain observer for sensorless control of the asynchronous machine Authors: DIB Abdou, FARZA Mondher and M'SAAD Mohammed, GREyC, Caen. Abstract: We propose a large-gain observer for estimating rotor flux, mechanical speed and load torque of the asynchronous machine from stator current and voltage measurements. The synthesis of this observer was preceded by an observability study, which demonstrated a sufficient observability condition similar to those already existing. When synthesizing the observer, precautions were taken to handle situations where the motor passes through singular points, i.e. points at which the motor is unobservable. The performance of this observer has been tested in simulation using a realistic benchmark. Various situations were considered, including one where the motor remains, for a time, in an unobservable region. Lunch. Afternoon 2:00 pm - 4:30 pm 2:00 pm - 2:45 pm: Title: Output high order sliding mode control of unity-power-factor in three-phase AC/DC Boost Converter, Authors: Jianxing Liu, Salah Laghrouche and Maxim Wack. SET, Belfort. Abstract: In this presentation, a full-bridge boost power converter topology has been studied for power factor control, using output high order sliding mode control. The controller regulates the output voltage while keeping power factor close to One, by ensuring minimum frequency deviation and phase difference between voltage and current. Super Twisting Observers have been employed to estimate the source voltage with the measurement of DC link current. Parametric uncertainties and load perturbations have also been considered in the controller design. Simulation results show effectiveness of the proposed controller and observers. 14h45- 15h 30 : Titre : Etat de l'art de la commande des machines synchrones à double saillance Auteurs : M. Hilairet, LGEP Résumé : The MRVDS double saliency variable reluctance machine, which we are interested in, has attracted the attention of many researchers over the last decade. It offers many advantages. It has no brushes or commutators, is very simple in design and is made from low-cost materials. The absence of magnets and windings on the rotor makes it extremely robust. What's more, advances in power electronics and the availability of high-speed digital ECUs have played a major role in introducing this machine to the industrial world. Like all types of machine, the MRV has a number of drawbacks that limit its use today. Control is complicated, as its electromagnetic characteristics depend on phase current and rotor position. The torque developed is highly undulating and the noise generated is significant. Our work therefore concerns the variable-speed motor operation of a MRVDS 8/6. The aim is to develop simple, high-performance control strategies over a wide torque and speed range, which can be useful for various industrial applications. 3.30 - 4.15 pm: Title: Sensorless Second Order Sliding Mode Observer for Induction Motor, Industrial Application Authors: M. Ghanes, ECS-Lab, GSMaintenance Abstract: A second order sliding mode observer for the induction motor without mechanical sensor is presented. This observer converges in finite time and is robust to the variation of parameters. Using Matlab/Simulink, the simulation results show the performance of the proposed observer. Furthermore, an industrial application is presented in order to highlight the technological interest of the proposed method and also show the difficulties due to real time computation constraints. 16:15: Review of the day's proceedings and discussion of developments in the group's research themes, future actions, etc.