Vector Control of Three-Phase AC Machines (eBook)
XVI, 340 Seiten
Springer Berlin (Verlag)
978-3-540-79029-7 (ISBN)
The book deals with the problem area of the vector control of the three-phase AC machines like that one of the induction motor with squirrel-cage rotor (IMSR), the permanentmagnet excited synchronous motor (PMSM) and that one of the doubly fed induction machine (DFIM) from the view of the practical development. It is primarily about the use of the IMSR as well as the PMSM in the electrical drive systems, at which the method of the field-oriented control has been successful in the practice, and about the use of the grid voltage oriented controlled DFIM in the wind power plants.
After a summary of the basic structure of a field-oriented controlled three-phase AC drive, the main points of the design and of the application are explained. The detailed description of the design rules forms the main emphasis of the book. The description is expanded and made understandable by numerous formulae, pictures and diagrams. Using the basic equations, first the continuous and then the discrete machine models of the IMSR as well as of the PMSM are derived. The vectorial two-dimensional current controllers, which are designed with help of the discrete models, are treated in detail in connection with other essential problems like system boundary condition and control variable limitation. Several alternative controller configurations are introduced. The voltage vector modulation, the field orientation and the coordinate transformations are treated also from the view of the practical handling. The problems like the parameter identification, parameter adaptation and the management of machine states, which are normally regarded as abstract, are so represented that the book reader does not receive only attempts but also comprehensible solutions for his system.
The practical style in the description of the design rules of the drive systems are also continued consistently for the wind power systems using the DFIM. The represented control concept is proven practically and can be regarded as pioneering for new developments.
The introduced control structures of the three machine types have led to a relatively mature stage of development in the practice. Some disadvantages have nevertheless remained at these linear control concepts, which have to be cleared only with nonlinear controllers. Going out from the structural nonlinearity of the machines, the suitable nonlinear models are derived. After that, nonlinear controllers are designed on the basis of the method of the 'exact linearization' which proves to be the most suitable in comparison with other methods like 'backstepping-based or passivity-based designs'.
Formula symbols and abbreviations 7
Table of Contents 11
1 Principles of vector orientation and vector orientated control structures for systems using three- phase AC machines 17
1.1 Formation of the space vectors and its vector orientated philosophy 17
1.2 Basic structures with field-orientated control for three- phase AC drives 22
1.3 Basic structures of grid voltage orientated control for DFIM generators 27
1.4 References 31
2 Inverter control with space vector modulation 33
2.1 Principle of vector modulation 34
2.2 Calculation and output of the switching times 39
2.3 Restrictions of the procedure 42
2.4 Realization examples 47
2.5 Special modulation procedures 65
2.6 References 74
3 Machine models as a prerequisite to design the controllers and observers 77
3.1 General issues of state space representation 77
3.2 Induction machine with squirrel-cage rotor (IM) 85
3.3 Permanent magnet excited synchronous machine ( PMSM) 101
3.4 Doubly-fed induction machine (DFIM) 106
3.5 Generalized current process model for the two machine types IM and PMSM 111
3.6 Nonlinear properties of the machine models and the way to nonlinear controllers 113
3.7 References 121
4 Problems of actual-value measurement and vector orientation 123
4.1 Acquisition of the current 124
4.2 Acquisition of the speed 126
4.3 Possibilities for sensor-less acquisition of the speed 132
4.4 Field orientation and its problems 143
4.5 References 155
5 Dynamic current feedback control for fast torque impression in drive systems 159
5.1 Survey about existing current control methods 160
5.2 Environmental conditions, closed loop transfer function and control approach 171
5.3 Design of a current vector controller with dead-beat behaviour 175
5.4 Design of a current state space controller with dead beat behaviour 183
5.5 Treatment of the limitation of control variables 188
5.6 References 198
6 Equivalent circuits and methods to determine the system parameters 201
6.1 Equivalent circuits with constant parameters 202
6.2 Modelling of the nonlinearities of the IM 207
6.3 Parameter estimation from name plate data 220
6.4 Automatic parameter estimation for IM in standstill 227
6.5 References 239
7 On-line adaptation of the rotor time constant for IM drives 241
7.1 Motivation 241
7.2 Classification of adaptation methods 247
7.3 Adaptation of the rotor resistance with model methods 251
7.4 References 270
8 Optimal control of state variables and set points for IM drives 273
8.1 Objective 273
8.2 Efficiency optimized control 274
8.3 Stationary torque optimal set point generation 277
8.4 Comparison of the optimization strategies 295
8.5 Rotor flux feedback control 298
8.6 References 301
9 Nonlinear control structures with direct decoupling for three- phase AC drive systems 303
9.1 Existing problems at linear controlled drive systems 303
9.2 Nonlinear control structure for drive systems with IM 304
9.3 Nonlinear control structure for drive systems with PMSM 311
9.4 References 316
10 Linear control structure for wind power plants with DFIM 317
10.1 Construction of wind power plants with DFIM 317
10.2 Grid voltage orientated controlled systems 319
10.3 Front-end converter current control 325
10.4 References 330
11 Nonlinear control structure with direct decoupling for wind power plants with DFIM 331
11.1 Existing problems at linear controlled wind power plants 331
11.2 Nonlinear control structure for wind power plants with DFIM 332
11.3 References 339
12 Appendices 341
12.1 Normalizing - the important step towards preparation for programming 341
12.2 Example for the model discretization in the section 3.1.2 344
12.3 Application of the method of the least squares regression 346
12.4 Definition and calculation of Lie derivation 350
12.5 References 351
Index 353
| Erscheint lt. Verlag | 11.12.2008 |
|---|---|
| Reihe/Serie | Power Systems | Power Systems |
| Zusatzinfo | XVI, 340 p. |
| Verlagsort | Berlin |
| Sprache | englisch |
| Themenwelt | Naturwissenschaften ► Physik / Astronomie |
| Technik ► Elektrotechnik / Energietechnik | |
| Schlagworte | Control • Drive systems • electrical drives • Feedback • Field-orientated control • Induction machines • Linearity • Measurement • Motors • Nonlinear Control • Nonlinear Controller • Normal • optimal control • plants • Power Systems • Three-Phase AC Machines • Vector Control • Wind Power Plants |
| ISBN-10 | 3-540-79029-2 / 3540790292 |
| ISBN-13 | 978-3-540-79029-7 / 9783540790297 |
| Haben Sie eine Frage zum Produkt? |
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