Francis Labrique - Academia.edu (original) (raw)

Papers by Francis Labrique

MELECON - IEEE Mediterranean Electrotechnical Conference, 1996

We present in this paper an analytical study of an indirect DC-DC converter using a bridge series... more We present in this paper an analytical study of an indirect DC-DC converter using a bridge series resonant inverter operating above the resonant frequency. If the operation is in the ZVS mode, the snubbers reduce to capacitors in parallel with the inverter power electronic components. The aim of the paper is to determine the conditions allowing one to obtain ZVS

PESC `92 Record. 23rd Annual IEEE Power Electronics Specialists Conference, 1992

This paper presents a fully digital position control system for small power surface mounted PM sy... more This paper presents a fully digital position control system for small power surface mounted PM synchronous actuators. The control algorithm relies on a simplified decoupling state feedback in order to obtain field orientation. There is no current measurement, and the current values needed to compute the control algorithm are predicted from a model. This makes it possible to use a

ISIE '93 - Budapest: IEEE International Symposium on Industrial Electronics Conference Proceedings, 1993

The aim of this paper is to compare the performance of two indirect field oriented control scheme... more The aim of this paper is to compare the performance of two indirect field oriented control schemes. In the first one, the Park components of the stator currents are controlled by two PI regulators, and in the second one, these currents are not directly controlled and there is no current measurement. It is shown that the sensitivity of the flux

ISIE '93 - Budapest: IEEE International Symposium on Industrial Electronics Conference Proceedings, 1993

Abstruct -This paper deal0 with the fully digital control of synchronous reluctance motors. A con... more Abstruct -This paper deal0 with the fully digital control of synchronous reluctance motors. A control algorithm baaed on the strategy consisting of keeping conetant the d axis component of the stator currents, and controlling the torque by the q axis component of them currents is investigated. The effects of the sampling period, the delay due to computation time and the parameter uncertainties, on the stability and the robustness of the current control, are analysed. It is found that, with the proposed control algorithm, values of the sampling period which are compatible with the use of low cost microcontrollera may be chomn. Digital simulations confirm the theoretical study.

IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 1999

The purposes of this paper are first to show that fixed point processors can meet the needs of hi... more The purposes of this paper are first to show that fixed point processors can meet the needs of high performances, and even complex AC motor control algorithms; and then to present a way, well adapted for the normalized fixed point structure, in which voltages can be rounded in the d-q frame, in order to avoid overflows in the a-b-c frame,

AMC'98 - Coimbra. 1998 5th International Workshop on Advanced Motion Control. Proceedings (Cat. No.98TH8354), 1998

A simplified vector control scheme of an induction actuator is revisited. Its performance in term... more A simplified vector control scheme of an induction actuator is revisited. Its performance in terms of flux and speed control is compared with that of a control scheme based on an exact inverse model of the motor for determining the flux amplitude and angular position. The comparison is made by taking into account the discrete and nonlinear effects that the

Proceedings of MELECON '94. Mediterranean Electrotechnical Conference, 1994

This paper deals with the fully digital control of an induction actuator. A direct field oriented... more This paper deals with the fully digital control of an induction actuator. A direct field oriented control system using simplified digital current controllers, in order to reduce the computation power needed for the microprocessors, is investigated. The stability problems related to the discretization inherent to the digital control of the currents are analysed. The good performance of the proposed control algorithm, especially against parameter uncertainties, is shown by digital simulations

Proceedings of MELECON '94. Mediterranean Electrotechnical Conference, 1994

Thyristor switched capacitor-thyristor controlled reactor (TSC-TCR) static VAr compensators are t... more Thyristor switched capacitor-thyristor controlled reactor (TSC-TCR) static VAr compensators are today widely used for supporting the voltage in AC distribution systems. In this paper, the stability of the closed loop part of such a compensator is investigated by using the recurrences theory. The nonlinear behaviour of the system is highlighted

ABSTRACT Polyphase permanent magnet synchronous motors are well suited for building high performa... more ABSTRACT Polyphase permanent magnet synchronous motors are well suited for building high performance fault tolerant actuation systems. Such systems are found for instance in aerospace applications where reliability is a major concern. The first part of the paper summarizes the main features of polyphase permanent magnet segment synchronous motors. In the second part of the paper we study how to build a simple and efficient torque controller when the harmonic content of the machine EMFs can be neglected. In particular it is shown that this controller allows a very easy detection of a fault occurrence and a controller reconfiguration limited to an action on the link existing between the reference values of the phase currents and of the torque.

Mathematics and Computers in Simulation, 1998

The aim of this paper is to propose a modification in the classical indirect field oriented contr... more The aim of this paper is to propose a modification in the classical indirect field oriented control strategy to reduce its sensitivity to electrical parameter uncertainties. This modification is based on a theoretical sensitivity analysis and introduces in the control strategy a very simple fuzzy logic block to ensure the field orientation.

IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200), 1998

Considering the growth of AC motor applications and the complexity of the algorithms used for the... more Considering the growth of AC motor applications and the complexity of the algorithms used for their control, a new multiprocessor architecture has been designed specially for this task. This approach is justified by the fact that the motor control algorithms can by divided into several tasks able to be executed in parallel. In this paper, the separation of a motor

Proceedings of First International Caracas Conference on Devices, Circuits and Systems, 1995

This study concerns an indirect DC-DC series resonant converter. The first parameter for controll... more This study concerns an indirect DC-DC series resonant converter. The first parameter for controlling this type of converter is the operating frequency. When a phase shift β is introduced between the controls of the two legs, we get a second parameter for controlling the conversion. Using the state plane, the recurrence equation of state variables have been determined and used

Mathematics and Computers in Simulation, 2003

Global dynamical models of power electronic systems allow to compute their dynamics in a very eas... more Global dynamical models of power electronic systems allow to compute their dynamics in a very easy way as they replace the switching behavior of the power electronic converter by a continuous process [F. Labrique, H. Buyse, G. Seguier, R. Bausiere, Les convertisseurs de l'electronique de puissance-Commande et comportement dynamique, vol. 5, Technique et Documentation, Lavoisier, ]. But they are unable to predict the ripples induced by the switching behavior of the power semiconductor switches.

[1991 Proceedings] 6th Mediterranean Electrotechnical Conference, 1991

A stability analysis is made of a single-phase thyristor controlled reactor (TCR) system with an ... more A stability analysis is made of a single-phase thyristor controlled reactor (TCR) system with an integral control loop for the reactive power. The nonlinear aspects of the dynamics of the system and their influence on its stability have been taken into account by using recurrence equations

J3eA, 2009

En Belgique au niveau de la formation des ingénieurs universitaires, la réforme de Bologne a cond... more En Belgique au niveau de la formation des ingénieurs universitaires, la réforme de Bologne a conduit à remplacer l' approche traditionnelle de deux ans de formation générale suivie de trois ans de spécialisation par une approche de type 3+2 (bachelor degree, master) dans laquelle les étudiants choisissent au cours du premier cycle des modules « techniques », tels que l'électricité, la mécanique, la chimie-physique, …, les préparant à des masters de spécialisation dans ces domaines. Dans ce contexte où des choix se font très tôt dans le curriculum, offrir via des activités de projet une approche qui permet aux étudiants de découvrir des aspects du métier liés à une discipline peut jouer un rôle significatif au niveau de l'attractivité des formations proposées. C'est dans ce contexte que la présente communication décrit une expérience de projet réalisée cette année et montrant comment l'enseignement des circuits électriques peut permettre aux étudiants de comprendre les principes et réaliser un prototype d'un dispositif en prise directe avec la technologie actuelle, à savoir un ampli audio de classe D. Mots clés : dispositif pédagogique, transfert de savoir-faire, retour d'expérience.

J3eA, 2002

Mis en ligne le 12 août 2002.

2007 International Conference on Power Engineering, Energy and Electrical Drives, 2007

The purpose of this study is to develop a suspension system for a low-cost flywheel energy storag... more The purpose of this study is to develop a suspension system for a low-cost flywheel energy storage system. This suspension system is composed of two identical magnetic bearings mounted at the end of the flywheel. Due to a specific design of these magnetic bearings, it has the particularity to have only one active axis (sustentation). The others (centering) are passively

2009 8th International Symposium on Advanced Electromechanical Motion Systems & Electric Drives Joint Symposium, 2009

This paper deals with the modelling and the control of a five-phase machine using a tooth-concent... more This paper deals with the modelling and the control of a five-phase machine using a tooth-concentrated winding technology. It is shown that the control of the torque can be easily performed in a generalized dq reference frame, and that with this control the motor can still operate when the feeding of one phase is lost. This makes the motor under

PESC Record. 27th Annual IEEE Power Electronics Specialists Conference, 1996

This paper presents a comprehensive analysis of the problems related to the implementation of the... more This paper presents a comprehensive analysis of the problems related to the implementation of the motor field oriented control in a fully digital control of a VSI fed PM synchronous motor drive system. All discrete effects involved in this process are taken into account; either they are related to the sampling introduced by the digital controller, or to the use

SPEEDAM 2010, 2010

Page 1. Optimal sinusoidal currents for avoiding torque pulsations after the loss of one phase in... more Page 1. Optimal sinusoidal currents for avoiding torque pulsations after the loss of one phase in polyphase SMPM synchronous motor F. Baudart, B. Dehez, F. Labrique, E. Matagne Université catholique de Louvain (UCL) Centre ...

MELECON - IEEE Mediterranean Electrotechnical Conference, 1996

We present in this paper an analytical study of an indirect DC-DC converter using a bridge series... more We present in this paper an analytical study of an indirect DC-DC converter using a bridge series resonant inverter operating above the resonant frequency. If the operation is in the ZVS mode, the snubbers reduce to capacitors in parallel with the inverter power electronic components. The aim of the paper is to determine the conditions allowing one to obtain ZVS

PESC `92 Record. 23rd Annual IEEE Power Electronics Specialists Conference, 1992

This paper presents a fully digital position control system for small power surface mounted PM sy... more This paper presents a fully digital position control system for small power surface mounted PM synchronous actuators. The control algorithm relies on a simplified decoupling state feedback in order to obtain field orientation. There is no current measurement, and the current values needed to compute the control algorithm are predicted from a model. This makes it possible to use a

ISIE '93 - Budapest: IEEE International Symposium on Industrial Electronics Conference Proceedings, 1993

The aim of this paper is to compare the performance of two indirect field oriented control scheme... more The aim of this paper is to compare the performance of two indirect field oriented control schemes. In the first one, the Park components of the stator currents are controlled by two PI regulators, and in the second one, these currents are not directly controlled and there is no current measurement. It is shown that the sensitivity of the flux

ISIE '93 - Budapest: IEEE International Symposium on Industrial Electronics Conference Proceedings, 1993

Abstruct -This paper deal0 with the fully digital control of synchronous reluctance motors. A con... more Abstruct -This paper deal0 with the fully digital control of synchronous reluctance motors. A control algorithm baaed on the strategy consisting of keeping conetant the d axis component of the stator currents, and controlling the torque by the q axis component of them currents is investigated. The effects of the sampling period, the delay due to computation time and the parameter uncertainties, on the stability and the robustness of the current control, are analysed. It is found that, with the proposed control algorithm, values of the sampling period which are compatible with the use of low cost microcontrollera may be chomn. Digital simulations confirm the theoretical study.

IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 1999

The purposes of this paper are first to show that fixed point processors can meet the needs of hi... more The purposes of this paper are first to show that fixed point processors can meet the needs of high performances, and even complex AC motor control algorithms; and then to present a way, well adapted for the normalized fixed point structure, in which voltages can be rounded in the d-q frame, in order to avoid overflows in the a-b-c frame,

AMC'98 - Coimbra. 1998 5th International Workshop on Advanced Motion Control. Proceedings (Cat. No.98TH8354), 1998

A simplified vector control scheme of an induction actuator is revisited. Its performance in term... more A simplified vector control scheme of an induction actuator is revisited. Its performance in terms of flux and speed control is compared with that of a control scheme based on an exact inverse model of the motor for determining the flux amplitude and angular position. The comparison is made by taking into account the discrete and nonlinear effects that the

Proceedings of MELECON '94. Mediterranean Electrotechnical Conference, 1994

This paper deals with the fully digital control of an induction actuator. A direct field oriented... more This paper deals with the fully digital control of an induction actuator. A direct field oriented control system using simplified digital current controllers, in order to reduce the computation power needed for the microprocessors, is investigated. The stability problems related to the discretization inherent to the digital control of the currents are analysed. The good performance of the proposed control algorithm, especially against parameter uncertainties, is shown by digital simulations

Proceedings of MELECON '94. Mediterranean Electrotechnical Conference, 1994

Thyristor switched capacitor-thyristor controlled reactor (TSC-TCR) static VAr compensators are t... more Thyristor switched capacitor-thyristor controlled reactor (TSC-TCR) static VAr compensators are today widely used for supporting the voltage in AC distribution systems. In this paper, the stability of the closed loop part of such a compensator is investigated by using the recurrences theory. The nonlinear behaviour of the system is highlighted

ABSTRACT Polyphase permanent magnet synchronous motors are well suited for building high performa... more ABSTRACT Polyphase permanent magnet synchronous motors are well suited for building high performance fault tolerant actuation systems. Such systems are found for instance in aerospace applications where reliability is a major concern. The first part of the paper summarizes the main features of polyphase permanent magnet segment synchronous motors. In the second part of the paper we study how to build a simple and efficient torque controller when the harmonic content of the machine EMFs can be neglected. In particular it is shown that this controller allows a very easy detection of a fault occurrence and a controller reconfiguration limited to an action on the link existing between the reference values of the phase currents and of the torque.

Mathematics and Computers in Simulation, 1998

The aim of this paper is to propose a modification in the classical indirect field oriented contr... more The aim of this paper is to propose a modification in the classical indirect field oriented control strategy to reduce its sensitivity to electrical parameter uncertainties. This modification is based on a theoretical sensitivity analysis and introduces in the control strategy a very simple fuzzy logic block to ensure the field orientation.

IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200), 1998

Considering the growth of AC motor applications and the complexity of the algorithms used for the... more Considering the growth of AC motor applications and the complexity of the algorithms used for their control, a new multiprocessor architecture has been designed specially for this task. This approach is justified by the fact that the motor control algorithms can by divided into several tasks able to be executed in parallel. In this paper, the separation of a motor

Proceedings of First International Caracas Conference on Devices, Circuits and Systems, 1995

This study concerns an indirect DC-DC series resonant converter. The first parameter for controll... more This study concerns an indirect DC-DC series resonant converter. The first parameter for controlling this type of converter is the operating frequency. When a phase shift β is introduced between the controls of the two legs, we get a second parameter for controlling the conversion. Using the state plane, the recurrence equation of state variables have been determined and used

Mathematics and Computers in Simulation, 2003

Global dynamical models of power electronic systems allow to compute their dynamics in a very eas... more Global dynamical models of power electronic systems allow to compute their dynamics in a very easy way as they replace the switching behavior of the power electronic converter by a continuous process [F. Labrique, H. Buyse, G. Seguier, R. Bausiere, Les convertisseurs de l'electronique de puissance-Commande et comportement dynamique, vol. 5, Technique et Documentation, Lavoisier, ]. But they are unable to predict the ripples induced by the switching behavior of the power semiconductor switches.

[1991 Proceedings] 6th Mediterranean Electrotechnical Conference, 1991

A stability analysis is made of a single-phase thyristor controlled reactor (TCR) system with an ... more A stability analysis is made of a single-phase thyristor controlled reactor (TCR) system with an integral control loop for the reactive power. The nonlinear aspects of the dynamics of the system and their influence on its stability have been taken into account by using recurrence equations

J3eA, 2009

En Belgique au niveau de la formation des ingénieurs universitaires, la réforme de Bologne a cond... more En Belgique au niveau de la formation des ingénieurs universitaires, la réforme de Bologne a conduit à remplacer l' approche traditionnelle de deux ans de formation générale suivie de trois ans de spécialisation par une approche de type 3+2 (bachelor degree, master) dans laquelle les étudiants choisissent au cours du premier cycle des modules « techniques », tels que l'électricité, la mécanique, la chimie-physique, …, les préparant à des masters de spécialisation dans ces domaines. Dans ce contexte où des choix se font très tôt dans le curriculum, offrir via des activités de projet une approche qui permet aux étudiants de découvrir des aspects du métier liés à une discipline peut jouer un rôle significatif au niveau de l'attractivité des formations proposées. C'est dans ce contexte que la présente communication décrit une expérience de projet réalisée cette année et montrant comment l'enseignement des circuits électriques peut permettre aux étudiants de comprendre les principes et réaliser un prototype d'un dispositif en prise directe avec la technologie actuelle, à savoir un ampli audio de classe D. Mots clés : dispositif pédagogique, transfert de savoir-faire, retour d'expérience.

J3eA, 2002

Mis en ligne le 12 août 2002.

2007 International Conference on Power Engineering, Energy and Electrical Drives, 2007

The purpose of this study is to develop a suspension system for a low-cost flywheel energy storag... more The purpose of this study is to develop a suspension system for a low-cost flywheel energy storage system. This suspension system is composed of two identical magnetic bearings mounted at the end of the flywheel. Due to a specific design of these magnetic bearings, it has the particularity to have only one active axis (sustentation). The others (centering) are passively

2009 8th International Symposium on Advanced Electromechanical Motion Systems & Electric Drives Joint Symposium, 2009

This paper deals with the modelling and the control of a five-phase machine using a tooth-concent... more This paper deals with the modelling and the control of a five-phase machine using a tooth-concentrated winding technology. It is shown that the control of the torque can be easily performed in a generalized dq reference frame, and that with this control the motor can still operate when the feeding of one phase is lost. This makes the motor under

PESC Record. 27th Annual IEEE Power Electronics Specialists Conference, 1996

This paper presents a comprehensive analysis of the problems related to the implementation of the... more This paper presents a comprehensive analysis of the problems related to the implementation of the motor field oriented control in a fully digital control of a VSI fed PM synchronous motor drive system. All discrete effects involved in this process are taken into account; either they are related to the sampling introduced by the digital controller, or to the use

SPEEDAM 2010, 2010

Page 1. Optimal sinusoidal currents for avoiding torque pulsations after the loss of one phase in... more Page 1. Optimal sinusoidal currents for avoiding torque pulsations after the loss of one phase in polyphase SMPM synchronous motor F. Baudart, B. Dehez, F. Labrique, E. Matagne Université catholique de Louvain (UCL) Centre ...