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This paper focuses on several control techniques of a wind turbine of rated power of about 1 MW. In particular, a wind generator equipped with an asynchronous doubly-fed induction machine has been considered and its dynamic model in MATLAB/SIMULINK environment has been implemented. Starting from this model the feedback linearization control has been derived, and several simulations have been carried...
This paper presents a methodology for the analysis of frequency dynamics in large-scale power systems with high level of wind energy penetration by means of a simplified model for DFIG-based wind turbines. In addition, a virtual inertia controller version of the optimized power point tracking (OPPT) method is implemented for this kind of wind turbines, where the maximum power point tracking curve...
Switched reluctance motor (SRM) has great application potential in in-wheel motor electric vehicle (IWM-EV) due to its advantages, such as a high starting torque for initial acceleration, a wide operating speed range and high efficiency to extend the battery service life. However, the new structure of IWM-EV, e.g. SRM vertical force, airgap deformation has negative effect on vehicle safety and comfort...
The aim of this work is to control a permanent magnetic axial flux machine with non-sinusoidal back-emf, meant for electric vehicles, by applying a passivity based control strategy. Although, the drive is equipped with Hall Effect sensors, the performance of the system is improved by introducing a linear position observer. The control system consist in a nested current loop, designed using Passivity...
This paper studies the possibility of removing the position sensor from electric vehicles (EVs) powertrains that employ the externally-excited synchronous machine (EESM) for traction. Three position estimation approaches are studied: back-electromotive-force integration, state-observer and high-frequency voltage injection approaches. Theoretical background is presented, a comparative performance analysis...
It is well-known that in multiphase drives the spatial harmonics of the air-gap magnetic field can be controlled independently of each other. In this paper it is shown how the third-order spatial harmonic of the magnetic field can be used to estimate the rotor speed without the need of a mechanical sensor. Experimental results confirm the feasibility of the developed sensorless speed observer.
In this paper a systematic model based approach to state estimation for Permanent Magnet Synchronous Motor (PMSM) to built up sensorless drives is presented. A moving horizon estimation (MHE) algorithm is used, an optimization based scheme that yields excellent performance. Under mild assumptions, an optimal problem of type Equality Constrained Quadratic Programming (EQP) is resolved at each iteration...
This paper presents a study of the transient performance of the speed and position sensorless control of an interior permanent magnet synchronous motor (IPMSM) based on back-electromotive force (back-EMF) estimation method in the rotor reference frame. The fundamental characteristics of the estimated back-EMF, position and speed components using mathematical models of the IPMSM are analyzed. The analyzed...
Most Anisotropy based sensorless control schemes are using an additional voltage injection in order to create a measurable current ripple. This injection causes some unwanted side effects such as additional noise and torque oscillations, introduced by the harmonics of the current. This paper proposes an operating point dependent injection in combination with an arbitrary injection scheme in order...
The paper presents a control scheme for the sensorless induction motor that yields the estimates of the fluxes, motor speed and inverse of the rotor time constant. The motor is field-oriented using Direct Field Orientation — the stationary frame fluxes are obtained from a combined Current and Voltage Model Observer. The speed is obtained from a flux-based MRAS sliding mode observer. More importantly,...
The paper discusses two observer designs for estimation of the inverse of the rotor time constant of the induction motor. The paper presents the model and develops a linear and a sliding-mode observer. Estimation is based on the dynamic equation of the flux magnitude in the rotating reference frame. The stationary-frame fluxes are obtained using a voltage model observer — they are used for field orientation...
The in-wheel motor electric vehicle (IWM-EV) is an overwhelming tendency in modern automobile due to its unmatched advantages. However, the new structure of IWM-EV which packets driving motor in wheel will induce the new problems, e.g. motor unbalanced radial force and airgap deformation of driving motor, etc. For the IWM-EV performance, these new problem is one of the major concerns. Taken switched...
Power electronic converters enable wind turbines, operating at variable speed, to generate electricity more efficiently. Among variable speed operating turbine generators, permanent magnetic synchronous generator (PMSG) has got more attentions due to low cost and maintenance requirements. In addition, the converter in a wind turbine with PMSG decouples the turbine from the power grid, which favors...
A method for sensorless control of induction machines is proposed to estimate the field angle error using continuous excitation signals. Effects, which are present during a misalignment between the real world and model value, are used to estimate the error and correct it. Main flux oriented machine model equations, which take into account the magnetic anisotropies of the machine, are used to show...
Motor current measurement techniques as well as predictive control algorithms for electric drives rely on an assumption of linear motor currents changes resulting from constant inverter output voltages. Recent research has reported that this assumption does not hold in motors with short electrical time constant, and in drives whose rotor position advances substantially during a control period. This...
This paper presents a set of system equations of a dual stator induction machine (DSIM) and a new approach for online parameter identification including its verification through simulation and measurements. An uneven current share between the two three-phase systems of a DSIM is used to determine machine parameters online.
This paper presents an anisotropy-based position estimation approach taking advantage of saturation effects in permanent magnet synchronous machines (PMSM). Due to magnetic anisotropies of the electrical machine, current responses to high-frequency voltage excitations contain rotor position information. Therefore, the rotor position can be estimated by means of these current responses. The relation...
The purpose of this paper is to show a new state observer for doubly-fed generator. A proposed z-type observer algorithm based on mathematical model of doubly fed generator with additional variables treated as a disturbances has been used. A nonlinear multiscalar control method has been used to control active and reactive power of the generator. All analyses were verified by simulations and experiments...
This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation...
The paper considers and substantiates the possibility of using induction motors with frequency regulation instead of special engine types for precision control of large antennas. The dynamic errors arising in control systems during the low Earth orbit (LEO) satellites trajectories tracking are investigated. The simulation results of the test trajectory tracking using different laws of frequency regulation...
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