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The paper considers the problems of designing self-tuning output voltage regulators for standalone wind power plants equipped with asynchronized synchronous generators. Variations in wind speed and load (such as connection and disconnection of electric customers) result in variable output voltage and frequency of a windmill. Using an asynchronized synchronous generator allows one to fairly easily...
This paper proposes a model reference adjustable system observer for the sensorless control of doubly fed induction machines. The formulation is based on the direct calculation of the torque and flux rotor current components in the stator-flux-oriented coordinates by using the stator currents and voltages and the norm of the rotor current space vector. The tuning of the observer is discussed, and...
This paper presents an algorithm for speed controlled of the induction motor under sensorless. According to the Lyapunov stability theory, applying the vector analysis method, through the stator current and the rotor flux are calculated then rotor speed is estimated. In order to overcome the uncertainty of system parameters and the external load disturbance, the sliding mode surface is designed based...
Many high performance industrial and traction permanent magnet synchronous motor (PMSM) drives require position sensorless operation. Most of the sensorless control techniques are dependent on motor parameters, such as stator resistance, inductance, and torque constant. Thus, the performance suffers greatly in harsh and highly dynamic operating conditions, where the motor parameters are changing....
This paper presents a closed-loop automatic method able to identify all electrical parameters of single phases induction machines. The system is based on Robust Model Reference Adaptive Controller that is applied at qd axes machine model. The identification procedure is based on currents measurements with standstill rotor and is divided in two times: in the first time, all parameters of main winding...
The paper proposed a neural network solution to the indirect vector control of three phase induction motor including a real-time trained neural controller for the IM angular velocity which permitted the speed up reaction to the variable load. The basic equations and elements of the indirect field oriented control scheme are given. The control scheme is realized by one recurrent and two feedforward...
Present work shows the merits of space vector modulation direct torque control(SVM-DTC) over the conventional direct torque control(conventional DTC). SVM-DTC technique is helpful in solving the basic issues of torque ripple and variable swithing frequency present in the conventional DTC. In order to get the reference voltage vector which is necessary for the SVM-DTC, this paper describes a method...
This paper presents a novel speed & position estimation algorithm for the PMSG based wind turbine using Adaptive Network-Based Fuzzy Inference System (ANFIS). The precise information of rotor speed and position is required to perform maximum power tracking in variable speed wind turbine, which is very difficult to estimate under varying operating conditions, as it may lead to parameter variation...
Recently, interior permanent magnet synchronous motor (IPMSM) drives are getting more popular in many applications such as electrical vehicles. In order to achieve maximum torque per ampere (MTPA), knowledge of the motor parameters is necessary. Due to the saturation effect, variation of the motor parameters such as inductances is not avoidable. The main contribution of this paper is to use the well...
This paper presents employment of adaptive deadbeat current controllers in vector control scheme working in rotor flux coordinates. The changing parameters changes cause deterioration of control performance in high precision PM synchronous motor drives. The adaptive controllers with online identification keep the performance on a high level. On-line identification gives the estimate of the motor parameters...
Due to its great potential value in theory and application, nonlinear control strategies of synchronous motors (SM) in the nonlinear systems, especially passivity-based control (PBC) methods, have been a focus in the literature. An adaptive PBC strategy for SM with time-varying load torque to track flux and speed trajectories is proposed in this paper. The key point of this method is the identification...
In this paper, we introduced a linear motor-based transfer system with an active PID controller which can be replaced with an automated guided vehicle (AGV) for the port automation. This system, which is named LMCTS(liner motor-based container transfer system), is based on PMLSM (permanent magnetic linear synchronous motor) which basically consists of stator modules on the rail and shuttle car. Therefore...
This paper presents the direct model reference adaptive internal model controller for doubly fed induction generator used in wind farms based on MIT rule adjustment mechanism in addition to Perrin equation adjustment mechanisms with improved internal model controller filter design. Direct model reference adaptive internal model controller is developed and it is tuned using MIT rule adjustment mechanism...
A self-tuning two degree of freedom (2-DOF )PID controller based on fuzzy inference is presented. In view of the deficiency of conventional 2-DOF PID controller in the parameter time varying system, integrate the two-degree-of-freedom PID control with fuzzy techniques, a self-tuning PID controller based on fuzzy inference is designed. On-line automatically tuned parameters are realized at different...
In this paper a robust nonlinear controller is presented for doubly-fed induction machine (DFIM) drives. The nonlinear controller is designed based on combination of Sliding-Mode (SM) and Adaptive-Backstepping control techniques. Using the fifth order model of DFIM in a stator d, q axis reference frames with stator currents and rotor fluxes as state variables, a SM controller is designed in order...
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