By Jacek Kabziński
This contributed quantity is written by means of key experts operating in multidisciplinary fields in electric engineering, linking keep watch over concept, energy electronics, man made neural networks, embedded controllers and sign processing. The authors of every bankruptcy document the state-of-the-art of a number of the themes addressed and current result of their very own study, laboratory experiments and profitable purposes. The awarded ideas pay attention to 3 major parts of interest:
· movement regulate in complicated electromechanical structures, together with sensorless control;
· fault prognosis and fault tolerant keep watch over of electrical drives;
· new regulate algorithms for strength electronics converters.
The chapters and the total e-book own robust monograph attributes. very important functional and theoretical difficulties are deeply and appropriately provided at the history of an exhaustive state-of the artwork assessment. Many effects are thoroughly new and have been by no means released earlier than. famous keep an eye on equipment like box orientated keep watch over (FOC) or direct torque regulate (DTC) are referred as a kick off point for ameliorations or are used for comparability. between a variety of keep an eye on theories used to unravel specific difficulties are: nonlinear regulate, strong keep an eye on, adaptive keep an eye on, Lyapunov options, observer layout, version predictive keep watch over, neural keep an eye on, sliding mode keep watch over, sign filtration and processing, fault analysis, and fault tolerant control.
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Extra info for Advanced Control of Electrical Drives and Power Electronic Converters
It is required that the tracking error denoted by: ex ¼ xd À x ð8Þ is constrained for any t by a pre-deﬁned, rigorous inequality: jex ðtÞj\Dex ; ð9Þ for any initial conditions that assure jex ð0Þj\Dex . It follows from (9) that the position trajectory will be bounded by a hard constraint: jxðtÞj\Dx Dx :¼ Dex þ xmax : ð10Þ 3 Quadratic and Barrier Lyapunov Functions Lyapunov stability theory will be used to construct the stabilizing control for the discussed problem. For the sake of completeness, some preliminaries are given in this section.
If two electromagnetic variables are controlled the third one remains uncontrolled. However it simple to verify that if two controlled variables are stabilized, the third is stable, too. The multiscalar model for the stator current and main flux vectors is similar to the vector model used in the so-called direct torque control method. From comparison of the differential equation for the machine torque in the multiscalar model and differential equation for the torque in the known ﬁeld oriented and direct torque control it is clear that the torque is controlled by acting on its derivative through the control variable.
5 Transients of the speed and the electromagnetic variables during starting and loading of machine Z. 5 Time (s) exceeds the rated value. The rotor flux is always kept on the value which assures operation of the machine in an unsaturated region. As it can be seen in the last chart of Fig. 6 the third harmonic of the stator current appearing in the second plane has a different angle in relation to the fundamental in consecutive time intervals. The angle depends on the machine torque. For the very low torque only the magnetizing current components appear in the phase current.
Advanced Control of Electrical Drives and Power Electronic Converters by Jacek Kabziński