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. In this work we propose to develop an algorithm for improving the efficiency of an induction motor using type-2 fuzzy logic. Vector control is used to control this motor due to the high performances of this strategy. The type-2 fuzzy logic regulators are developed to obtain the optimal rotor flux for each torque load by minimizing the copper losses. We have compared the performances of our fuzzy...
In present work a modified MRAS for induction motors is presented. Associated with vector control, the speed estimation performances are improved especially at low speed. Lyapunov theory based controllers is used to design the controllers of the vector control. Robustness against the parameter variations and the low speeds mode is proven. The experimental tests are conducted using dSPACE DS1104.
Currently, many techniques based on steady state analysis have been applied to diagnosis of the AC machines. In this paper, it will be shown how the Park vector analysis can improve inter-turn faults detection. While the fault detection become easy by using the thickness and the shape of the Park vector. The simulation and experimental results confirm largely the effectiveness of the proposed technique.
This work deals with the control of the wind energy conversion system (WECS) equipped with two doubly-fed induction generators (DFIG). The main generator is controlled in order to keep the voltage and the frequency in the rates values. The second generator is connected when the power demand increase. But, before the connection, with the first generator, synchronization is done. After that, the system...
The Linear parameter Varying and sliding mode observers are studied in this paper. Both the rotor resistance and speed variation are considered. The design of the considered observers is described in detail. In order to conduct a comparative study, the measurements used for both observers are assumed available on an equal basis. Equally, the same controllers parameters are used in simulation of a...
A model reference adaptive system (MRAS) based speed estimator for sensorless induction motor (IM) drive is proposed in this paper. The MRAS is formed with flux rotor and the estimated stator current vector. The reference model utilizes measured current vector. On the other hand, the adjustable model uses the estimated stator current vector. The current is estimated through the solution of machine...
In this paper, we will discuss the technique of ripple correlation control (RCC) applied to photovoltaic maximum power point tracking (MPPT). To deliver maximum power from the photovoltaic system to the load under climatic variations, and to control a boost converter, MPPT based on ripple correlation control (RCC) technique has been used. Also to improve the performance of this MPPT and to overcome...
We propose in this paper an adaptive robust fuzzy observer to estimate flux and to identify the load torque for Induction Machine's (IM) applications. Indeed, using a fuzzy IM model, we develop the structure of an observer where we consider the load torque as an unknown input. Sufficient conditions are presented to ensure the asymptotic convergence of the flux and the load torque errors estimation...
The performance of a photovoltaic (PV) array is affected by temperature, solar insolation, shading and faults in PV array. Fault analysis in photovoltaic (PV) system is a fundamental task to protect PV panels from damage and to reduce risks of security hazards. In this context, this paper presents a MATLAB-based modeling and simulation scheme adapted for studying the I-V and P-V characteristics of...
In this paper, a control algorithm based on Backstepping technique for differential drive mobile robot path tracking is developed. The use of backstepping theory to solve the problem of path tracking is relatively new in the field of mobile robots control. Numerical simulations were conducted to show the effectiveness of the proposed algorithms to solve the nonholonomic constraints of the mobile robot,...
This paper propose a second-order sliding-mode observer for sensorless control of a permanent magnet synchronous motor. The corresponding observer is used to estimate the rotor speed. Simulation results are shown to confirm the effectiveness of the proposed method.
This paper deals with a Sensorless backstepping controller. In order to improve the robustness of the proposed approach, we estimate the rotor flux components and rotor speed of the induction motor using a sliding mode observer. The backstepping technique is appropriate for such as non linear system. The overall system stability is proved through appropriate Lyapunov functions. Experimental result...
In this article, we present a study based on the application of the new approach of the vectors of Park in the two axes ropers to the detection of the defects of bars in the three-phase induction machines. In order to simulate the behavior of the motor with defect, we propose the modeling of the diagram multi windings of the induction motor allowing apprehending his behavior in presence or absence...
The major problem of controlling a multi-variable electrical system comes mainly from the lack of information on its structure, which was supposed to always linear, a change in unexpected state may cause system instability, hence the requirement development of a new control structure incorporating nonlinear effects and time-varying phenomena while respecting the desired specifications on their stabilities...
The paper presents a comparison of performances and characteristics of a Self Scheduled linear parameter varying (LPV) Flux Observer and observation algorithms based on Kalman Filter for induction motor rotor flux estimation, inserted in a field oriented control scheme. The construction of the considered algorithms is described in detail, and the different design issues are explained. For true comparison...
This paper presents a sliding mode control (SMC) associated to the field oriented control (FOC) of a Brushless doubly fed induction generator (BDFIG) based wind energy conversion systems (WECSs). The stator of this machine incorporates two sets of three phase windings with different number of poles. The study of operation of the wind turbine leads us to two essential cases: optimization of the power...
This paper deals with speed sensorless flatness based control of permanent magnet synchronous motor (PMSM) using a second order sliding mode observer. In the first part, the flatness control is associated with PI controller, this solution shows good robustness with respect to parameter variations and guarantees torque and speed tracking. In the second part, the high order sliding mode speed observer...
This paper presents a decoupled indirect control of double fed induction generator intended to control the generated stator powers. This control is obtained from a some assumptions allowing to get the stator powers control from the injected rotor current which are fustily controlled in over to consolidate the decoupling control of active and reactive stator powers. The simulation results attest favorably...
This paper deals with an approach for the steady state analysis of Self Excited Induction Generator (SEIG). When an induction generator is used in an isolate operation, it operates in self-excitation mode. Therefore the advanced knowledge of the maximum excitation capacitor value is required. To find this capacitor value two non-linear equations have to be solved. Different numerical methods for solving...
This paper deals with a new approach of robust sensorless speed control intended to the induction motors. The speed estimation is done from the double use of the so-called self-control process (SCP) of the induction machine which characterizes the relationship between the stator, rotor and mechanical frequencies. Hence, in this approach, the output torque-current controller generates the so-called...
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