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In this manuscript, we propose to compare two novel sensorless strategies control of doubly fed induction generator (DFIG) based on the output electrical power, and rotor and stator current with stator voltage measurement. The performances of the proposed sensorless strategies are compared. The developed control strategy was tested for different operating modes: real wind speed with balanced and unbalanced...
This paper studies the performance of a Wind Energy Conversion System (WECS) with an induction generator under various start-up control techniques. The capability of self-excitation of the induction generator using three control techniques is examined. The generator is connected to the power grid by means of a fully controlled frequency converter which consists of a pulse-width modulation (PWM) rectifier,...
The paper presents an original direct-drive wind turbine control algorithm for a twelve-phase permanent magnet synchronous generator. The electrical machine is characterized by four independent three-phase star subsystems with isolated neutral point. Variable speed wind turbine control is achieved through a master control algorithm which synthesizes the setpoint in order to improve the reliability...
This paper deals with a protection and control strategy to enhance the low voltage ride through capability of a wind turbine driven doubly fed induction generator (DFIG). As the wind power penetration continues to increase, wind turbines are required to provide Low Voltage Ride-Through (LVRT) capability. Crowbars are commonly used to protect the power converters during voltage dips and their main...
Basic principles of a new type of induction motor, called Variable Impedance (Z) Induction Motor (VZIM), are introduced. The main goal of implementing this new structure of induction motors is to counteract the existing compromise in the design stage of induction motors between high starting torque at standstill and high breakdown torque and high efficiency at rated speed by combining these features,...
This paper describes a finite element (FE) based phase-variable model for double-star permanent magnet synchronous machines. In a double-star configuration where two three-phase windings are spatially shifted by 30 electrical degrees, a high amount of the 5th and 7th current harmonics may be excited because of the winding layout. However, a conventional d-q axis model considers only fundamental components,...
The paper deals with a synchronous motor control design. The field oriented control is assumed and it is suited for synchronous motor with permanent magnets. Current and voltage limitations are taken into account therefore a field weakening is used for reach high speed range with a most possible torque. A whole problem is solved using simulations in PC. Mathematical model of the synchronous motor...
In this paper the influence of geometry of permanent magnets and their basic parameters on the 1st harmonic of the magnetic flux in the air gap of the brushless DC motor are researched. The methodology of the brushless DC motor analysis is considered using functional relations. The paper includes the description of analysis methodology implementation stages: planning of computer experiments; its realization...
Nowadays switched reluctance machine is very ideal for many applications because of its simple configuration and having very high power density at low-cost. This paper analyzes and compares two different types of switched reluctance motor/generator (SRMG) and their applications. The proposed novel motor/generators consist of two magnetically independent stator and rotor sets (layers), where each stator...
A new configuration for the self-excitation of the induction machine invented by Magnus Lindmark is presented. The power electronic converter using solid state switches is connected to the rotor while the stator is directly connected to the grid. Using appropriate control, the reactive power consumed by the motor can be generated in the rotor resulting in unity power factor operation. The rotor connected...
The aim of the work described in this paper is to present a real-time Sensorless Vector Control method (SVC) of Induction Machines (IM) using an FPGA board. It's well known that the performance of sensorless control of induction motor drives is generally poor, especially at low speed due to measurement accuracy (offset, voltage distortions, current unbalances, machine parameter variation etc.). The...
This paper investigates the detectability of rotor broken bars in double cage induction motors using current signature and vibration analysis techniques. Double cage induction motors are commonly used for applications where successive loaded starts-up are mandatory. Experimental results were performed under healthy and faulty cases, and for different load conditions using each technique. Rotor broken...
The paper deals with the design of permanent magnet synchronous traction motor (PMSM) that was based on volume and stator windings of asynchronous traction motor with an output power 210 kW. The proposed PMSM was built with permanent magnets (PM) placed on the surface of the rotor. There will be described the basic parameters as well as analytical analysis of losses in the machine, with emphasis on...
In the paper a switched reluctance rotary-linear motor is proposed and investigated. It is mechanically robust, simple to construct and easy to operate also in hostile industrial and automotive environment. The stator is built up modularly from correctly shifted three usual 8 poles switched reluctance motor stators. The mover is constructed of several common 6 poles SRM rotor stacks. The motor is...
This paper presents the efficiency estimation of a double salient-pole Homopolar Brushless dc Generator in order to determine the optimum operation. For the under consideration generator an assistant dc field is replaced with permanent magnet in the rotor. Varying the amplitude and direction of the current in the field coil can control the generated output voltage to a level between zero volts and...
This paper studies the effects of static eccentricity on back-EMF of Axial Flux Permanent Magnet Machines (AFPMM). Effect of static eccentricity on back-EMF of AFPMs has not been studied before. Many studies have demonstrated that accurately assessing the behavior of Axial Flux PM Machines is not an easy task. Use of numerical modeling makes it possible to precisely study the eccentricity in these...
This work contributes to the development of control techniques for the drive systems of battery-powered electric vehicles, hybrid electric vehicles HEVs, 1st by introducing the design of a new motor efficient controller, in order to improve the energy efficiency of electric motors drives in HEVs and 2nd to achieve a fast torque response by applying a Seamless Direct Torque Control (DTC) method for...
The paper presents some issues on testing the generators, integrated in wind turbine systems. Generators are subject to perturbations transmitted from the source to the source and to perturbations determined by the variable speed of the turbines' blades. The paper reviews the standards concerning tests in wind systems and depicts some specific tests, using a programmable source and specific standard...
It is often noted in the literature that flux switching permanent magnet machines (FSPMs) exhibit “torque ripple”. We derive a detailed torque model of a 50 kW proof-of-concept FSPM and use this model to calculate reference trajectories for the current which lead to a ripple-free torque. Since these current trajectories contain higher frequencies we were concerned that structure-borne vibrations might...
In this paper a new analytic method for the determination of possibly arising cogging torque harmonics of brushless permanent magnet machines is presented.
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