Alstom

Areva T&d Sa

Alstom Grid Sas

Alstom Enterprise Sa

Alstom Transport Technologies

Alstom Transport Sa

Serge Poullain

Jean-Luc Thomas

Abdelkrim Benchaib

Jean-Claude Alacoque

Jean-Pierre Dupraz

Ernst Suter

Eric Bonin

Alain Oustaloup

Sylvain Plante

Patrick Latteux

Eric Courbon

Jocelyn Sabatier

Vincent Dionnet

A method of controlling at least one voltage converter having a plurality of cells in series, comprising an AC part and a DC part, characterized in that the AC input voltage (Vei) of each cell is determined directly by the use of a high speed current control loop relating to the AC part and a lower speed voltage control loop relating to the cells, the method including choosing the following voltage control law: where:

System and a method for controlling at least one voltage converter having a plurality of cells in series

A device for controlling a circuit-breaker intended for opening and closing this electric power cut-off device comprising a mobile contact, this control device comprising a motor with a rotary output shaft and being connected to power supply means and actuating means transforming the output displacement of the motor into a displacement of the contact, this device also comprising a mechanical spring arrangement involved in opening and closing the contact. The actuation means include a set of jointed elements providing the connection of the rotary shaft and of the ring, and, in the closed position of the contact, the set of jointed elements is near a dead centre position, a so-called open dead centre, the opening spring being only able to drive it towards the open position upon moving past this dead centre during opening.

Device for controlling an electric power cutoff device

A method is described for regulating the average electromagnetic torque of a polyphase rotating electrical machine, supplied with a polyphase voltage and a polyphase current that are generated by an inverter. The method comprises a step of controlling the machine, using an exact response control process to do this, a step of determining the value of the harmonics of the voltage and/or the current which are generated by the inverter, and a step of calculating the instantaneous torque set point as a function of the value of the harmonics and an average torque set point, so as to produce an instantaneous torque set point suitable for limiting the difference between the average of the instantaneous electromagnetic torque, between two successive regulation times, and said average torque set point.

Method and system for regulating the average electromagnetic torque of a rotating electrical machine, storage medium and data structure for carrying out the method

A method is described of regulating the instantaneous electromagnetic torque of a polyphase rotating electrical machine equipped with stator and/or rotor windings supplied by a voltage and a current generated by an inverter formed of switches whose switching is controllable. The method comprises a step of commanding the switching of the switches of the inverter using the fundamental frequency of the voltage generated by the inverter and a form of synchronous pulse width modulation configured as a function of an input set point, and a step of calculating the input set point from an instantaneous torque set point at each regulation time. The method further comprises a step of determining the time interval between two successive regulation times so that the time interval corresponds to an integer multiple of the period of oscillation of the instantaneous torque of the machine.

Method and system for regulating instantaneous electromagnetic torque and storage medium for implementing the method

Method and device for controlling the angular speed of an electromechanical drive train with little damping. The control of the speed of the load driven in rotation by an electromechanical drive train with little damping, possibly having transmission nonlinearities such as play, without measuring said speed, is accomplished by using an observer in conjunction with a robust CRONE-type non-integer order controller, the physical realization of which is achieved by an integer order controller obtained by approximation in the frequency domain. The device thus provides good damping for the system in the presence of resonance frequencies and excellent robustness, while still allowing a relatively simple adjustment.

Method and device for controlling angular speed of an electromechanical drive train with little damping

A method of regulating a rotating electrical machine includes a preparatory step of determining a discrete voltage control law for the machine. The discrete control voltage to be applied at each sampling time is determined in the form of a first term corresponding to free evolution of the state of the machine in the absence of control, between the preceding sampling time and the current sampling time, and a second term dependent on the set point torque and a set point for the magnetic energy consumed by the machine. The method further includes, at each sampling time, a step of determining, with the aid of the discrete control law, the control voltage to be applied to the machine for the torque of the machine to reach the set point torque and the magnetic energy consumed by the machine to correspond to the set point magnetic energy.

Method and a device for controlling and regulating an alternating current rotating electrical machine, in particular a synchronous alternating current rotating electrical machine

A method of regulating a rotary machine powered by a voltage inverter receiving, as input a control voltage delivered by a regulator servo-controlling the electromagnetic torque on a reference value, the regulator receiving as inputs the reference value and sat least one sampled signal representative of the torque of the machine, and proceeding at each sampling instant, to predict the torque value at a following sampling instant and to modify the control voltage accordingly. Servo-control of the torque including steps of prior computation of a discrete model of the system comprising the machine and the inverter to establish variation in torque between two sampling instants in the form of a first term that corresponds to free variation of the system in the absence of a control voltage, and a term corresponding to variation of the system under the action of a control signal, and of modifying the control voltage in such a manner as to cause the electromagnetic torque to vary from a value that corresponds to free variation of the torque to the reference value.

Method of regulating a rotary machine, and power supply circuit for such a machine

A method of controlling the torque of a rotary machine powered by means of an inverter and servo-controlled by a system having sensors, an observer, and a computer which delivers controls to the switches of the inverter on the basis of values supplied to the observer by the sensors, in the form of sequences of three vectors to bring the torque &Ggr; and the stator flux &PHgr;,of the machine towards reference values for &Ggr;,and &PHgr;,. The measurement sampling period is selected to be equal to the sequence period DTML which corresponds to half the switching period of the inverter. The characteristics of the vectors for each sequence are obtained by solving the following system of equations:

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Arpajon, France

Serge Poullain