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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...
In this paper the finite element model of the Brushless Doubly-Fed Machine is presented. A magnetodynamic finite element model allowing the simulation of the healthy and faulted machine with its special rotor topology is extracted and simulated. To verify the validation of the proposed model the results are compared with couple circuit model, which used generalized harmonic theory.
Interior permanent magnet-synchronous machines (IPMSM) feature many favourable properties for e-mobility application as high power density and good efficiency. However, they require careful modelling because of strong anisotropies of the rotor, as they are also known from salient-pole synchronous machines. These anisotropies are often accounted for by different values for the d-axis and q-axis inductances...
The paper deals with analysis of the situation in a six-phase induction machine. The method of space vectors is used for this purpose. The necessity to consider higher space harmonic waves of a current layer, flux density and flux in the stator yoke is shown in the case of feeding by unbalanced stator voltages. Equations of a six-phase machine are derived and the relation between symmetrical components...
The paper presents a novel vector control structure for the Brushless Doubly-Fed Machine (BDFM) which is derived based on the machine synchronous operation. In fact, the synchronous operation of the BDFM provides an efficient approach for determining the required reference angle in the machine vector control structure. The utilization of such reference angle makes the vector control structure presented...
The inter-turn short circuits fault of field windings is a common fault in generators. According to the multi-loop method of AC machines, this paper proposes multi-loop mathematical model of turbine generator with inter-turn short circuits fault of field windings. Based on the model, the normal operation and the short circuits fault operation of generator with no load have been simulated combining...
Temperature rise of the form-wound multi-conductor stator winding of a 1250-kW cage induction motor was analyzed. Eddy currents in the winding significantly affect the temperature rise. The eddy current was modeled using time-discretized finite-element analysis (FEA). The resistive losses in each of the bars obtained from the FEA are used as input for thermal modeling. The distance from the air gap...
Multiple motors connected to a single closed-loop inverter drive is a common type of drive topology which has wide application in steel processing industry, electric railway systems and electric vehicles. But condition monitoring for this type of drive configuration remains largely unexplored. This paper proposes a new method to detect the stator turn-to-turn fault in a multiple-motor drive system...
This paper presents the simulation and experimental results of a 42 V fault-tolerant six-phase induction machine (6PIM) with opened stator phases. The 6PIM has symmetrical 60 degrees displacement winding allowing fault-tolerant modes for an electric power steering (EPS) application. A voltage source inverter (VSI) in closed-loop using a vector control feeds its. The 6PIM model is derived from the...
This paper analyzes the behavior of DFIG and converter in the case of grid fault including symmetrical and unsymmetrical fault. First, the simple space vector models are presented to estimate the moduli of DFIG stator voltage in different grid fault. Then with the symmetrical components method, the dynamic response of DFIG and converter in grid fault is analyzed in details, and the equations of grid...
This paper presents a novel scheme, for detection and magnitude determination of turn faults, based on parameter identification of a model in which the turn fault is considered. A particle swarm optimization (PSO) algorithm does parameter identification. Insensitivity of the technique to load variation, supply voltage variation, temperature variation and unbalanced supply voltage is shown by many...
The aim of this paper is to develop a doubly-fed induction machine (DFIM) model suitable for the simulation of this machine in the healthy mode and faulty mode. Indeed, the developed model allows the simulation of the inter-turn short circuit in the stator or the rotor of the machine in any system with control circuits and/or connections to the grid by means of power electronics converters. The circuit-oriented...
The paper has shown the development of a generic model for the thermal analysis of stator geometries that when base lined against a standard thermal analysis program has shown similar accuracy and reduced computational time. This paper has also shown a technique for transforming typical stator geometries to a simplified geometry in polar coordinates.
In this article we present a methodology for calculating the electromagnetic torque of a synchronous machine (SM) using the concept of the real density of current based on the generalized distribution function. To validate the model, we consider a three-phase SM with a location of the conductors in the slots in a special way ldquowinding-step shortcutrdquo to the stator windings and a direct current...
This paper focused on modeling and controlling of a doubly-fed induction generator (DFIG). The presented model is developed based on the basic flux linkage, voltage and torque equations. In order to control the DFIG's active power, a suitable method based on PSO algorithm has been proposed. The simulation results show that the presented method is a useful way to improve the output power of DFIG.
The brushless Doubly-Fed Machine (BDFM) shows commercial benefits in the wind power generation. This paper presents a vector control scheme for the BDFM operating as a variable speed generator (VSG). The proposed vector controller is developed on the power winding stator flux frame, and can be used to control both speed and reactive power. The machine model and the control system are developed in...
The paper presents the vector model of the brushless doubly-fed machine (BDFM) in the rotor flux oriented reference frame. The rotor flux oriented reference frame is well known in the standard AC machines analysis and control. Similar benefits can be sought by employing this method for the BDFM. The vector model is implemented in MATLAB/SIMULINK to simulate the BDFM dynamic performance under different...
In this paper a simple dynamic model for a PMSM with inter-turn winding fault is derived. FEM is used for parameter determination of the machine with inter-turn fault. This fault model is used to study the behavior of the machine with inter-turn fault. The experimental test is conducted to validate the fault model for different levels of fault severity. The comparison of the results obtained by the...
This paper describes an analysis method for achieving control torque and speed with vector control for induction motors. An indirect field-oriented output feedback motor controller is presented; it is suitable for low-cost applications. A current model control is used to sense back electromotive force (back-EMF) by means of an analog to digital converter (ADC); its simulation and filtering are discussed...
In this work a fuzzy inference system is employed for the control of a PWM based direct torque control (DTC), driving a dual three phase induction machine (DTPIM). DTPIM has two, three phase windings spatially phase shifted by gamma (=60deg in this research) electrical degrees. The proposed control scheme uses a Fuzzy inference system to modulate the phase of stator voltage vector applied to the DTPIM...
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