Eric Monmasson

Control of a doubly fed induction generator for aircraft application

This paper presents a variable speed constant frequency system (VSCF) for aircraft applications. The system consists in a doubly fed induction generator (DFIG) connected to a stand-alone aircraft grid through its stator windings. It uses back-to-back PWM converters connected to the rotor for sub and super synchronous speed operation. A permanent magnet synchronous machine (PMSM) connected to a variable speed prime mover supplies these converters. The control strategy of the DFIG is carried out through a rotor-flux inner control loop and a stator-voltage outer loop. The vector control of the PMSM and the DC link voltage regulation are also presented in this paper. Simulation results demonstrate the feasibility of the proposed system.

Thermal parameter identification of simplified building model with electric appliance

In order to reduce heat energy demand in residential building, thermal insulation and indoor air tightness become more important. However, in a well-insulated environment, internal heat gain caused by solar radiation, metabolism and losses of home electric appliance (i.e. refrigerator, lamp, television, etc.) can be dominant to home global energy management. To quantify and to modelize the heat gain due to home appliances, we begin experimental measurements in a well-insulated room. The first step in this work is the identification of the room. In this paper we suggest a 1R1C lumped parameter circuit which presents a building thermal model using thermal-electric analogy. Then, we identify the circuit components (the global thermal resistor and the global thermal capacitor) from the heat balance equation and experimental results. Based on the model and the obtained parameters, we simulate the indoor temperature of the model using Matlab/Simulink. To check its accuracy we compare the measured data and simulation results and calculate their error ratio.

Design of an output LC filter for a doubly fed induction generator supplying non-linear loads for aircraft applications

This paper presents a variable speed constant frequency (VSCF) system for aircraft applications. More accurately, it focuses on the design of an output filter to reduce the influence of non-linear loads. The VSCF system consists in a doubly fed induction generator (DFIG) supplying a stand-alone aircraft grid through its stator windings. It uses back-to-back PWM converters connected to the rotor for sub and super synchronous speed operation. A permanent magnet synchronous machine (PMSM) connected to a variable speed prime mover supplies these converters. An efficient control strategy of the system was presented in a previous paper for linear loads. However, non-linear loads such as 6-pulse diode rectifiers, that can represent up to 50% of the total load introduce undesirable current harmonic components. A LC output filter is thus designed to eliminate them. Simulation results demonstrate the feasibility of the proposed system.

Hybrid excitation synchronous motor control in electric vehicle with copper and iron losses minimization

This paper presents an optimal current control for the hybrid excitation synchronous motor in electric vehicle application. The control aims to meet the torque and speed requirements while insuring minimal copper and iron losses. Extended Lagrange multipliers optimization method (Kuhn-Tucker conditions) is used to elaborate analytical expressions for the optimal reference armature currents as well as for the field current if with respect to armature current and voltage constraints. Simulation over the new European driving cycle proves that the proposed optimal control leads to the lowest losses compared to the results obtained by other synchronous motor control strategies.

Parameters Estimation of the Actuator used in Haptic Interfaces: Comparison of two Identification Methods

In advanced motor control systems, an accurate knowledge of motor parameters is essential in order to achieve good performances. Some of these parameters, such as stator resistances, are sometimes given by constructors, but they vary according to the operating conditions. This paper presents and compares two parameter identification methods of an actuator used in haptic interfaces which, in this case, is a permanent magnet synchronous machine (PMSM). Using these methods, the electrical parameters of the PMSM can be determined during different operating conditions. Physical parameters estimation of a dynamic 4-parameter model is performed on the one hand, using an output error identification method based on a non linear programming algorithm and on the other hand, using an identification method based on least-squares techniques and inverse models

Control of a DC generator based on a Hybrid Excitation Synchronous Machine connected to a PWM rectifier

This paper deals with the control of an hybrid excitation synchronous generator which is used to supply an isolated grid for aircraft applications. This grid is supposed to be a 270 V DC bus. Thus, a rectifier is required between the machine and the DC bus. Two structures can be used: diode or PWM rectifier. Here, only the structure with a PWM rectifier is studied. With a such system, it is possible to use a vector control applied to the structure in order to obtain minimal copper losses in the machine. The controller is synthesized here using a methodology based on a graphical representation of the system and then it is validated by simulation

Modeling and simulation of a hybrid dynamic system used in haptic interfaces

A haptic system consists of an articulated mechanical structure with motors and position sensors, as well as embedded electronics allowing force feedback. It is driven by a haptic interface, which enables the user to interact with an image in a virtual reality application, through the sense of touch. Thus, it is a hybrid dynamic system, which contains subsystems with continuous dynamics and subsystems with discrete dynamics that interact with each other. This paper develops a hybrid dynamic system model of the system, which takes into account the different sampling periods of the desired regulation, and the interaction between continuous, switching and discrete subsystems. It is interesting when very short electrical transients coexist with very long mechanical ones.

Control of a hybrid excitation synchronous generator connected to a diode rectifier supplying a DC bus

This paper deals with the modeling and the control of the hybrid excitation synchronous machine (HESM) connected to a diode bridge rectifier. The set is operating as a DC generator that supplies an isolated grid in embedded applications such as aircraft electrical power generation. Saturation effects have also been taken into account. The aim of the control is to maintain the DC bus voltage constant when the load and/or the speed of the rotor vary. Simulation results validate this approach.

Simultaneous Identification of the Initial Rotor Position and Electrical Parameters of a PMSM for a Haptic Interface

A haptic system consists in an articulated mechanical structure with motors and position sensors, as well as embedded electronics allowing force feedback. It is driven by a haptic interface, which enables the user to interact with an image in a virtual reality application, through the sense of touch. This paper presents a simple identification protocol using inverse models and least-squares techniques. It simultaneously estimates the initial motor/encoder setting angle essential to obtain the best dynamic behavior of the system and the electrical parameters of the permanent magnet synchronous machine driving the interface. This identification is necessary in the case of unknown parameters to achieve a robust control strategy of the overall system in terms of transparency and stiffness

Predictive control of a doubly-fed induction generator connected to an isolated grid

This paper presents a predictive control of a doubly fed induction generator (DFIG) dedicated to embedded systems power supplies like aircraft electrical generation systems. In such applications, efficiency and weight are the main performance criteria for the choice of adapted structures. The predictive control presented here is synthesized on the basis of a graphical representation of the DFIG: dynamical equivalent circuit which is adapted to the design of controllers dedicated to generators. The controller proposed here is then validated by simulations and experimental results