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The paper analyzes the theory of generating short circuit current during three-phase fault to research the low voltage ride through (LVRT) control of doubly fed induction generator (DFIG). The approximate analytical expressions of short circuit current are given in the condition of no load and synchronous speed to simplify the analysis. Based on this, the influences of different pre-fault conditions,...
This paper addresses the sensorless control scheme of induction machines using transient voltage excitation at zero and low frequencies. The method is based on saliency detection through the use of pulse excitation and the evaluation of the response of the machine line currents changes. Different signal processing structures are necessary for the rotor position estimation. The estimation algorithm...
This paper presents a main flux oriented model of an induction machine which considers the saturation in both magnetizing and leakage inductances. The model is based on a virtual air gap. With this model it is possible to simulate the saturation characteristic and the cross-saturation effect. The validity of these results is proved with measurements on a test bench. A procedure is presented that shows...
Due to limited space availability in vehicular applications, machines with high torque density are required. One of the ways to maximize space is by reducing machine end winding length and increasing its effective stack length. This paper illustrates a general design process used for implementing non-overlapping concentrated windings an interior permanent magnet (IPM) machine for field weakening applications...
A special permanent magnet synchronous motor for ship propulsion in the power range between 50 and 250 kW is presented. It is fed by a PWM-voltage source inverter with field oriented control. A motor feature is the very low stator inductance. It leads to low reactive power and high maximum torque, but on the other hand it produces large current ripples and therefore harmonic losses up to 10 % of the...
According to earlier work and papers by other authors, the main flux path of an induction machine is not only saturated due to the magnetizing current, or in other words ldquothe magnetizing inductance can be modeled as a function of torquerdquo. In addition, at a given magnetizing current, the flux linkage decreases with rising supply frequency. These effects should be considered when using control...
This paper presents a new approach for hardware in the loop testing of voltage source inverters for drive applications. For this purpose the inverter is not connected to a real machine, but to a second power inverter instead, which acts like an electrical machine. Thereby the inverter under test can operate in its normal mode, which in the most of the cases is a field oriented current control with...
The paper presents a model of a poly-phase permanent magnet motor of the marine propulsion drive energized by multistage VSI. The model defines more precisely the non-sinusoidal waveform of back-EMF and its impact on the current distortion and electromagnetic torque ripples. The paper concludes by analyzing simulation results that have shown significant suppression of high order current harmonics...
There are several application fields where high power synchronous motor drives are requested to supply high torques at standstill. To this end, the information on the rotor absolute angular position is needed from the first instant of operations. A new procedure to detect the rotor position of synchronous motors without absolute encoder is presented. In particular, an automatic procedure and a simplified...
This paper presents several shaft voltage reduction techniques for doubly-fed induction generators in wind turbine applications. These techniques includes: pulse width modulated voltage without zero vectors, multi-level inverters with proper PWM strategy, better generator design to minimize effective capacitive couplings in shaft voltage, active common-mode filter, reducing DC-link voltage and increasing...
A model predictive DTC algorithm used for the Lyapunov stability function based DTC of induction motor control is presented in the paper. It is proposed as an alternative to the classical approaches based on the look-up tables, where the contribution of electromotive force is not considered. An appropriate Lyapunov function is chosen and, based on its derivative, optimal stator voltage vector is determined...
In this work the application of additional switching states for the asymmetric converter is studied for its use in direct torque control. The proposed algorithm makes use of previously discarded states, that can increase the operational range of asymmetric converters by increasing the total number of switching states available for control. The proposed algorithm was simulated while controlling an...
Aerospace systems require high power density as well as high availability. An integrated permanent magnet machine and drive has been considered. System integration aids achieving high power density in aerospace applications whereas fault tolerance increases availability, mostly by increasing system phase count. This increase in the number of system phases has certain, differing effects on various...
This paper discusses the sensorless control capability of an outer rotor PMSM with two different concentrated stator coil winding configurations resulting in a single- and double-layer configuration at same machine geometry. As a key parameter the differential inductance in direct and quadrature axis over current load is measured and compared. Furthermore the steady state short circuit current is...
The authors propose a new diagnosis method for on-line broken bars detection by parameters estimation. For predictive detection, Kalman filtering algorithm has been adapted to take into account the on-line parameters deviations in faulty case. Within the framework of the diagnosis of the rotor defects, it is difficult to conduct experimental tests to validate the on-line identification of such default...
In addition to the IEEE standard test procedure for induction motors (IM), several advanced methods have been presented to achieve higher accuracy on parameters estimation. Some of them allow to estimate with high precision only a specific parameter, while others improve the parameters estimation at the price of high computational efforts and time due to finite elements analysis or the use of recursive...
The paper deals with the diagnostic problems of the converter-fed induction motors in the case of stator faults. For diagnostic purposes the neural detector was developed trained and tested using measurement data of negative components of the stator current and impedance, for different levels of stator failures, load torque and converter frequencies. Feedforward neural network with very simple internal...
A new method for Grid connection of a Doubly Fed Induction Generator (DFIG) based wind power generation system relying on DPC principles is presented. This control method, called Direct Power Control for Grid Connection (DPCGC), is particularly very simple and gives fast response of the stator voltage to meet the synchronization conditions. Indeed the fact that the efficiency of the widely known control...
This paper presents a 1.5-kW, 150,000-r/min PM motor fed by a 12-V power supply, which is applicable to an automotive supercharger. The motor is specially designed to improve its efficiency over 97% (excluding a mechanical loss) and to raise its power density to 13 W/cm3 at the same time. Feasibility of the design is confirmed through experimental tests, using a prototype motor.
In this paper some different control strategies, suitable for open-phase fault operation of seven-phase current regulated induction motor drives, are presented. These strategies, which are valid in steady-state as well as in transient operating conditions, are compared in terms of stator and rotor copper losses and torque pulsations. The comparison is carried out by means of an opportune mathematical...
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