Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

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Voltage source PWM inverter for PMSM supply Chapter 3 VOLTAGE SOURCE PWM INVERTER FOR PMSM SUPPLY 3.1 Introduction The block scheme of an adjustable speed drive (ASD) commonly used in industrial applications to supply three-phase AC motor is presented in Fig. 3.1. Three-phase grid Rectifier DC link filter Inverter AC motor Choke Figure 3.1 Basic scheme of adjustable speed AC motor system. An ASD is supplied from three or single phase grid. It consists of a diode rectifier, DC link filter and an inverter. The rectifier converts supply AC voltage into DC voltage. The DC voltage is filtered by a capacitor in the DC link. The inverter converts the DC to an variable voltage, variable frequency AC for motor speed or (torque/current) control. The rectifier section of an ASD, called the front end, is responsible for generating current harmonics into the power supply system. Therefore, to reduce the total harmonic distortion (THD) of phase current it is necessary to add additional choke inductances. There are generally to way how insert choke inductances (see Fig. 3.2). a) b) L F D 1 D3 D5 D 1 D3 D5 L F L F C F U DC C F U DC L F D 2 D4 D6 D 2 D4 D6 L F Fig. 3.2 Three phase diode rectifier with smoothing choke: a) at the input b) at the DC link side. By adding a choke inductance at the input of rectifier gives the significant harmonic reduction. Some drive manufactures are starting to include this choke inductance in the DC link of the drive, providing the same harmonic current reduction benefit. Regarding to power electronics standards IEEE Std 519 it is recommended that production of harmonics should be less than 5%. It is a trend to replace the diode 34
Voltage source PWM inverter for PMSM supply rectifier by fully controllable active rectifier [8] (see Fig. 3.3), which guaranties following futures: • power flow from AC/DC or DC/AC side (there is no need of break resistor ), • significant reduction of phase current THD, • unity power factor (phase voltage is in phase with current), • reduction of DC link capacitor, • controllable DC link voltage. Three-phase grid Active Rectifier DC link filter Inverter AC motor Choke Fig. 3.3 Modern AC/DC/AC converter topology of adjustable speed drives. In the next part of this thesis the author will be focus on voltage source inverter. 3.2 Voltage source inverter (VSI) The made constant DC voltage by rectifier is delivered the to the input of inverter (Fig. 3.4), which thanks to controlled transistor switches, converts this voltage to three-phase AC voltage signal with wide range variable voltage amplitude and frequency [3]. Voltage Source Inverter C F T 1 D 7 T 3 D 9 T 5 D 11 U DC O C F T 2 D 8 T 4 D 10 T 6 D 12 A B C U sAN U sBN U sCN N Three-phase motor windings Figure 3.4 Basic scheme of voltage source inverter circuit. 35
Page 1 and 2: POLITECHNIKA WARSZAWSKA WARSAW UNIV
Page 3 and 4: Contents Table of Contents Chapter
Page 5 and 6: Introduction Chapter 1 INTRODUCTION
Page 7 and 8: Introduction to surface-mounted mac
Page 9 and 10: Introduction vector control, which
Page 11 and 12: Introduction presented and studied.
Page 13 and 14: Modeling and control modes of PM sy
Page 37: Modeling and control modes of PM sy
Page 41 and 42: Voltage source PWM inverter for PMS
Page 57 and 58: Control methods of PM Synchronous m
Page 69 and 70: Direct Torque Control with Space Ve
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Direct Torque Control with Space Ve
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Sensorless Speed Direct Torque Cont
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DSP implementation of DTC-SVM contr
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Summary and closing conclusion Chap
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Appendices APPENDICES A1 Rotor and
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Appendices ⎡ ⎤ ⎢ 1 0 ⎥ ⎡K
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Appendices i(t1->t0)+=it1 it1: it1=
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Appendices A7 PWM technique - six s
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List of symbol List of symbols Symb
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References Books and PhD-Thesis 1.
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References 39. J.-I. Itoh, N. Nomur
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References 74. N. Ertugrul, P. Acar
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References 108. D. Świerczyński,
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