Asenkron makinaların rotor alan yönlendirmeli kontrolu
Control of induction machines by means of vector control
- Tez No: 39803
- Danışmanlar: PROF.DR. M. EMİN TACER
- Tez Türü: Yüksek Lisans
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1994
- Dil: Türkçe
- Üniversite: İstanbul Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 93
Özet
specipications fas increased. This demond made the field oriented drive systems or a c. servo drives made attractive. The already known superiorities of induction motors are added the drive systems in which vector control is applied. The thesis consists of six chapters. In previous parts of the study, bot the modelling of induction machine and vector control methods are presented. The general containings of each chapter is given in the following. The first chapter deals with the general approach of the thesis and the historical developments of vector control methods. In second chapter, the rotor-flux-oriented control of induction machines is introduced in both direct and indirect methods. It is assumed that the induction machine is supplied by a pulse-width modulated (PWM) voltage source thyristor inverter, whose switching frequency is low. These converters are used up to 100 kW and one of the main applications is the high dynamic performance position- controlled servo drive. At lower power levels, inverters containing transistors are used where the switching frequency is high. Because of low switching frequency, it is not possible to achieve fast closed-loop current control of stator currents. In this drive the stator currents can contain time harmonics with large amplitudes, since the stator currents cannot be assumed to be impressed by fast control loops. So it is necessary to utilize the stator voltage equations, once the equation of the stator reference voltages are established. In third chapter, stator flux-oriented control of induction machines are considered briefly, and stator, rotor and torque equations expressed in the stator flux-oriented reference frame are given. The main assumptions made in the previous section are also valid in this chapter, especially the effects of magnetic saturation are neglected in all chapters. These assumptions and others to establish mathematical model also are as follows: i. A symmetric machine ii. A linear magnetization characteristic of the iron, that is, inductances do not vary with currents iii. Negligible iron losses iv. Pure sin-wawe distribution, in space, of the rotating magnetic field v. Negligible slot effects in the rotor and stator vi. A smooth rotor Since there is a large similarity between stator-flux-oriented control and rotor flux- oriented control, emphasis is only laid on the differences between these two control techniques. In fourth chapter, magnetizing flux-oriented control of induction machines are represented briefly. And steady state stability limits are derived for three techniques mentioned above. In fifth chapter, in order to examine more detaily the digital simulation which is powerfull tool for such studies is employed. In this chapter a simplified model is used to simulate squirrel cage induction machine which is controlled by using rotor-flux-oriented vector control technique. XII
Özet (Çeviri)
In the last chapter, the results obtanied throughout the thesis are given and final conclusions are made. xmspecipications fas increased. This demond made the field oriented drive systems or a c. servo drives made attractive. The already known superiorities of induction motors are added the drive systems in which vector control is applied. The thesis consists of six chapters. In previous parts of the study, bot the modelling of induction machine and vector control methods are presented. The general containings of each chapter is given in the following. The first chapter deals with the general approach of the thesis and the historical developments of vector control methods. In second chapter, the rotor-flux-oriented control of induction machines is introduced in both direct and indirect methods. It is assumed that the induction machine is supplied by a pulse-width modulated (PWM) voltage source thyristor inverter, whose switching frequency is low. These converters are used up to 100 kW and one of the main applications is the high dynamic performance position- controlled servo drive. At lower power levels, inverters containing transistors are used where the switching frequency is high. Because of low switching frequency, it is not possible to achieve fast closed-loop current control of stator currents. In this drive the stator currents can contain time harmonics with large amplitudes, since the stator currents cannot be assumed to be impressed by fast control loops. So it is necessary to utilize the stator voltage equations, once the equation of the stator reference voltages are established. In third chapter, stator flux-oriented control of induction machines are considered briefly, and stator, rotor and torque equations expressed in the stator flux-oriented reference frame are given. The main assumptions made in the previous section are also valid in this chapter, especially the effects of magnetic saturation are neglected in all chapters. These assumptions and others to establish mathematical model also are as follows: i. A symmetric machine ii. A linear magnetization characteristic of the iron, that is, inductances do not vary with currents iii. Negligible iron losses iv. Pure sin-wawe distribution, in space, of the rotating magnetic field v. Negligible slot effects in the rotor and stator vi. A smooth rotor Since there is a large similarity between stator-flux-oriented control and rotor flux- oriented control, emphasis is only laid on the differences between these two control techniques. In fourth chapter, magnetizing flux-oriented control of induction machines are represented briefly. And steady state stability limits are derived for three techniques mentioned above. In fifth chapter, in order to examine more detaily the digital simulation which is powerfull tool for such studies is employed. In this chapter a simplified model is used to simulate squirrel cage induction machine which is controlled by using rotor-flux-oriented vector control technique. XIIIn the last chapter, the results obtanied throughout the thesis are given and final conclusions are made. xmspecipications fas increased. This demond made the field oriented drive systems or a c. servo drives made attractive. The already known superiorities of induction motors are added the drive systems in which vector control is applied. The thesis consists of six chapters. In previous parts of the study, bot the modelling of induction machine and vector control methods are presented. The general containings of each chapter is given in the following. The first chapter deals with the general approach of the thesis and the historical developments of vector control methods. In second chapter, the rotor-flux-oriented control of induction machines is introduced in both direct and indirect methods. It is assumed that the induction machine is supplied by a pulse-width modulated (PWM) voltage source thyristor inverter, whose switching frequency is low. These converters are used up to 100 kW and one of the main applications is the high dynamic performance position- controlled servo drive. At lower power levels, inverters containing transistors are used where the switching frequency is high. Because of low switching frequency, it is not possible to achieve fast closed-loop current control of stator currents. In this drive the stator currents can contain time harmonics with large amplitudes, since the stator currents cannot be assumed to be impressed by fast control loops. So it is necessary to utilize the stator voltage equations, once the equation of the stator reference voltages are established. In third chapter, stator flux-oriented control of induction machines are considered briefly, and stator, rotor and torque equations expressed in the stator flux-oriented reference frame are given. The main assumptions made in the previous section are also valid in this chapter, especially the effects of magnetic saturation are neglected in all chapters. These assumptions and others to establish mathematical model also are as follows: i. A symmetric machine ii. A linear magnetization characteristic of the iron, that is, inductances do not vary with currents iii. Negligible iron losses iv. Pure sin-wawe distribution, in space, of the rotating magnetic field v. Negligible slot effects in the rotor and stator vi. A smooth rotor Since there is a large similarity between stator-flux-oriented control and rotor flux- oriented control, emphasis is only laid on the differences between these two control techniques. In fourth chapter, magnetizing flux-oriented control of induction machines are represented briefly. And steady state stability limits are derived for three techniques mentioned above. In fifth chapter, in order to examine more detaily the digital simulation which is powerfull tool for such studies is employed. In this chapter a simplified model is used to simulate squirrel cage induction machine which is controlled by using rotor-flux-oriented vector control technique. XIIIn the last chapter, the results obtanied throughout the thesis are given and final conclusions are made. xm
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