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An enhanced control is presented that effectively cancels the noise in torque, and currents in a wind turbine Permanent Magnet Synchronous Generator. The proposed control also allows the reduction of the DC-Link capacitance. Simulations succeed on Three Phase and Single Phase grid connection, through a Back to Back converter. The grid side converter switching function was modified with an algorithm...
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...
A dual mechanical port electric (DMP) machine is used as an electrical variable transmission (EVT) in hybrid electric vehicle (HEV). In the conventional HEV, this machine is replaced to planetary gear box and two electric machines and makes their structures simpler. In this paper improved vector control of DMP machine with optimum design of PI speed controller and implementation of MTPA method is...
Brushless Doubly-Fed Machine (BDFM) is a machine which incorporates the robustness of the squirrel cage induction machine while having the speed and power factor control of a synchronous machine. A special kind of rotor called Nested-Loop rotor plays an important part in the BDFM, coupling the two stator fields. In future BDFM will share a large part in wind power market. This paper presents a mathematical...
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...
Permanent magnet synchronous motors are used in many industrial applications because they have several inherent advantages. However, information about the rotor position is necessary even to be able to control drive speed. Conventional speed and position detection uses encoder and resolver. These sensors significantly increase price, weight, and degrade reliability. Therefore many authors publish...
This paper deals with a practical sensorless control method for doubly-fed-induction-generator based wind power generation systems. The speed estimator is based on a novel control scheme called active disturbance rejection control. Encouraging simulation results have been obtained.
Because of its low maintenance and robustness, induction motors have many applications in the industries. Most of these applications need fast and smart speed control system. This paper introduces a smart speed control system for induction motor using fuzzy logic controller. Induction motor is modeled in synchronous reference frame in terms of dq form. The speed control of induction motor is the main...
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...
The ultrasonic motor (USM) is a popular actuator and used in industry and academic research in the last decades because it has the advantages of high holding torque, good response characteristics, high torque density, silent operation, free of electromagnetic noise and compact size. However, the motor are time-varying and highly nonlinear system which the parameters varied with increasing temperature...
The paper studies sliding mode variable structure control system for a novel gearless windlass balance oil pumping unit (GWBOPU) driven by low-speed and high-torque permanent magnet synchronous motor (PMSM). By analyzing the correlative relationships of the motor and the load, a mathematics model for GWBOPU is established. Base on this model, a speed sliding mode controller is designed by regarding...
Based on the vector control method for PMSM, a parameter self-learning hybrid fuzzy controller was implemented to provide the speed control for the EV propulsion system with the purpose to obtain the maximum acceleration during starting and accelerating. A three-term fuzzy controller is implemented by simply using a two-term fuzzy control rule-base without any increase of rules. The method of fuzzy...
The low cost and high reliability of controlled induction motor drives without mechanical speed sensors made them to become more and more attractive. The information on the rotor speed is obtained from measured stator voltages and currents at the motor terminals with replace the sensor (mechanical sensor). Vector controlled drives require estimating the magnitude and spatial orientation of the fundamental...
A new velocity and torque control strategy based on the direct control of stator flux linkage is introduced due to the disadvantage of permanent magnet synchronous motor circuit vector control and traditional direct torque control. By controlling the trajectory of stator flux linkage vector, flux linkage and torque control are achieved, thus permanent switching frequency and small flux linkage pulse...
The permanent magnet synchronous motor (PMSM) is increasingly playing an important role in alternating current transmission system. Recently, lots of researches have been investigated for the PMSM system without speed and position sensors. A vector-control system of the improved MRAS for PMSM is proposed in this paper. The new Model Reference Adaptive System (MRAS) based on speed positive feedback...
A detailed mathematical model of doubly-fed induction generator (DFIG) is derived according to generator convention. A novel S-Function is proposed to describe the mathematical model of DFIG. The simulation subsystems of no-load operation and generator operation are developed based on state equations. The control of the rotor current inner loop and the rotating speed outer loop are designed based...
This paper presents a method for estimating the torque and speed of line-start induction motor (IM). IM is being used for various purposes because that is a high trust machine for the load mechanism and can be used easily. So, IM is non-breakable. However, load mechanism sometime break. We try to check the condition of load mechanism by estimate the torque and speed of IM. We take up the motor-operated...
This paper, presents a Direct Field-Oriented Control (DFOC) of doubly fed induction machine (DFIM) motor mode with a variable structure control based on a sliding mode control (SMC). Our aim is to make the speed and the flux control robust to parameter variations. The use of the nonlinear sliding mode method provides very good performance for motor operation and robustness of the control law despite...
Permanent magnet synchronous (PMSM) drives become very popular in many industrial applications. Their construction provides better performance and reliability than DC drives. But there is also one significant disadvantage - actual rotor position knowledge is necessary to control the drive even in the case when only speed control is required. A position sensor has to be used increasing the drive cost...
A matrix converter is an electricity converter to operate direct conversion of variable voltage variable frequency (VVVF) without DC link part. Some applied examples of motor drives by the matrix converter are shown [1]. This paper presents basic characteristic of parallel-connected dual induction motor drives with the matrix converter. Purposes of this system are low cost and saving space in the...
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