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In recent years the possibility of incorporating type II high temperature superconductors (HTS) into power applications such as electrical motors, generators, bearings and fault current limiters has attracted much attention. Hysteresis superconducting motors offer the simplest construction and in this paper a drum and disc type configuration are considered. Comparison in terms of specific torque produced...
In this paper, an analytical approach is used to determine the Flux-linkage characteristic of regular Switched Reluctance Machines (SRMs) considering simple geometry aspects. The proposed method is derived from an 8/6 SRM magnetic characteristic obtained by experimental tests and validated by FEM results. In order to reduce calculation time and expense, regarding simulation and implementation proposes,...
This paper describes a mathematical model to determine the equivalent circuit parameters of Axial Flux Disc Machines (AFDMs) of whatever configuration. Once fixed the dimensions of the machine (magnet width, winding lengths, axial thickness, etc.), the equivalent inductance and resistance and finally the current are calculated, for a generator operation mode. The model has been implemented in a software...
Successful optimization processes of highly utilized industrial squirrel cage induction machines enforces fast, reliable and accurate design concepts. Therefore, modern numerical finite element calculation procedures, which incorporate moveable rotor parts, non-linear iron saturation effects and realistic geometric properties, have been systematically established and applied to an induction motor...
A simple position-sensorless method for the detection of rotor position of the wound-rotor induction machine in order to implement stator flux orientation is described and evaluated in this paper. The method is based on the comparison of the actual and the estimated rotor current using the classical model of this machine in the rotor reference frame. It is similar to the MRAS methodology, but uses...
This paper proposes a novel algorithm to generate the optimum d- and q-axis current reference for the drive system of PMSMS (permanent magnet synchronous motor with sinusoidal excitation) in the entire flux weakening region and also to generate the limits of PI speed controller. The algorithm offers optimum torque capability for PMSMS despite significant changes in dc link voltage and machine parameters...
The electrical motion drives are more and more used in various industrial processes. The choice of the motor drive is based on power, speed, precision, and cost requirements. There are many different types of motors for motion drives application. AC and DC motors feature brushed or brushless designs are suitable for a variety of industrial applications. Speed, torque and position control are the most...
The application background and operating principle of the Switched Reluctance Starter/Generator (SR S/G) system are briefly introduced. The structure and technical parameters of an undergoing 30 kW Switched Reluctance Machine (SRM) and its converter are described. Based on these works, the thermal analysis of the SRM and its converter are presented in detail. The transient lumped-parameter thermal...
Equal area criterion, used to transient stability analysis of power system, is consistency with transient energy function method for single machine-infinite bus system or two machines system. The criterion can be used to fast classification of transient stability, fast calculations of critical fault-clearing time and stability degree. However, machine group division and equivalence etc affect its...
A polar chart of the power converter supply current, comprising phase currents and rotor mechanical position information, is presented, in order to characterize the dynamic operation of a SRM drive. Power converter supply current can be used as additional information of extreme importance when a sensor error or failure occurs. Its analysis is then important and permits to develop appropriate fault...
This paper deals with the control of multiphase surface mounted permanent magnet (SMPM) synchronous machines with mechanically and magnetically decoupled phases. As this type of machines is well suited for fault tolerant drives in critical applications as aerospace applications, the paper focuses on the power architecture and torque control strategies allowing to produce an almost ripple free torque...
This current article shows a procedure to improve wind turbines for kinetic energy conversion in mechanics using a new concentrating design based on moist air phase change. This concentrator presents special interest in the European Atlantic Coast because its weather is mild with a high relative humidity and its winds represent low values for wind turbines applications. Results show a clear possibility...
This article proposes a method to enable variable speed wind turbine primary regulation. The method consists of adjusting the power-speed curve of the turbine to the grid frequency, thus varying the percentage of maximum power available injected to the grid. This is achieved by operating at rotational speed different from the optimal, and not controlling the pitch angle. Two practical implementations...
Nowadays, wind turbines implementing doubly fed induction generators (DFIG) occupy the largest share of the wind power market. These machines incorporate the benefits of variable speed generators in a cost-effective way but are very sensitive to grid disturbances and especially to voltage dips. To prevent the damages that grid disturbances can cause to the converter, the machines are equipped with...
This paper presents a general modeling and an experimental validation of a doubly fed induction generator (DFIG) based wind conversion system (WCS). The wind conversion system has been briefly presented. Then, the d q control of the grid side converter (GSC) has been detailed theoretically. Moreover, the decoupled active and reactive powers control of the DFIG has been presented. The last is carried...
In this paper, a poly-phase disc motor innovative feeding and control strategy, based on a variable poles approach, and its application to a high temperature superconductor (HTS) disc motor, are presented. The stator windings may be electronically commutated to implement a 2, 4, 6 or 8 poles winding, thus changing the motor's torque/speed characteristics. The motor may be a conventional induction...
The principle operation of eddy current brakes is based on relative motion of a rigid conductive core in a magnetic field. In spite of simple structure, eddy current brakes employ complicated mathematical relations in operation. In the past, many researchers have investigated the problems of eddy current brakes. But most of them only considered distribution of induced currents and the resultant magnetic...
This paper describes the models of a wind power system, such as the turbine, generator, power electronics converters and controllers, with the aim to control the generation of wind power in order to maximize the generated power with the lowest possible impact in the grid voltage and frequency during normal operation and under the occurrence of faults. The presented work considers a wind power system...
A novel structure of backstepping control has been proposed for indirect field oriented control of induction motor drive. Voltage and current signals are usually contaminated with high frequency switching noises due to SVPWM inverter. The proposed structure avoids real time integration and its associated drift problems, which in practice are the source of generation of unwanted noise. These problems...
This paper presents speed sensorless direct torque control (DTC) of induction motor using artificial intelligence (AI). The artificial neural network (ANN) MRAS-based speed estimation is used. The error between the reference model and the neural network based adaptive model is used to adjust the weights by on-line back propagation (BP) training algorithm. The speed loop regulation is carried out by...
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