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Wind turbines require periodic maintenance procedures to ensure reliable operation of the system. Regular servicing of the rotor demands calibration of the speed and position sensor in aggravated circumstances of the dynamic wind. This sensor is one of the most critical components for the drive reliability and the calibration greatly increases the time of repair. The main focus of the paper is to...
This paper presents an encoderless highperformance synchronous reluctance motor drive for traction applications. The control system is based on the active flux concept and a hybrid rotor position estimation algorithm is used, being this algorithm based on the injection of high-frequency signals at low speeds and on the position of the active flux vector for medium and high-speeds. A smooth transition...
Induction motors (IM) usually operates at low efficiency under light load, which can cause significant energy loss in industry. In addition, the electrical vehicles require for high efficiency drive system. Therefore it is significant to develop a high efficiency control strategy for induction motor which can adapt to load condition for optimal flux finally for optimal efficiency. However, real time...
A new design of a digital control system for the grid-connected doubly fed induction generator is described in this paper. A discrete-time state-space model of the controlled system is obtained in the stator stationary reference frame. Using this model, a discrete-time sliding mode based control system is designed. Its tasks are the grid synchronization and the direct power control. The discrete-time...
A new indirect power control strategy using modelbased predictive current control (MB-PCC) is presented in this paper for a doubly fed induction generator (DFIG) driven by an indirect matrix converter suitable for wind energy systems. In this paper the power reference is used to develop a new expression for the stator current in terms of the rotor current. A step by step methodology is presented to...
This paper presents a Predictive Direct Power Control Applied to the Doubly Fed Induction Generator operating with or without voltage dip, in variable speed operation. The predictive controller is obtained from state-space DFIG model. The control law is derived by optimization of a cost function that considers the difference between the predicted outputs — stator active and reactive powers — and their...
This paper presents a control system of an Induction Machine (IM) with predictive controller-estimator. A novel speed estimator is proposed, and the estimator operation is examined at different operational conditions. The new estimator shows an improvement in the speed estimation during the transient operation compared to the conventional estimators, and it also shows a satisfactory operation at different...
In order to become independent from the world market prices of rare earths, this paper is an approach to the robust and high-performance speed control of a permanent magnet-free synchronous reluctance machine (SynRM) for the use in the pitch system of a modern wind turbine. Enhancing previous works, we combine near-torque-optimal and self-sensing control using an extended Kalman filter (EKF) with...
System modeling and variables estimation are two important task in direct control strategies. In those schemes, the system performance is strongly related with the accuracy of the discrete-time model, especially for time-varying systems, e.g., high-performance motor drive applications. This investigation presents a numerical comparison between several discrete-time models of the induction machine...
In this paper, a non-linear model predictive controller (NMPC) is formulated as an objective function aiming to track the rotor speed for a wind turbine. The proposed controller is applied directly to the nonlinear model of wind turbine without the use of any linearization technique. When compared to methods reported in the literature, the simulation results showed that the proposed controller outperforms...
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