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

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Sensorless Speed Direct Torque Control with Space Vector Modulation (DTC-SVM) The speed estimation problem is still open, especially at low and zero speed operations. The accuracy of presented method depends on accuracy of applied stator flux estimation and differentiation algorithm. It allows, however, for robust start, closed loop operation above 10% of nominal speed, and braking the drive to zero speed. 6.5 Summary The main problems associated with PMSM sensorless speed operation are presented in this Chapter. For robust start of PMSM without the temporary rotor reversal a special initialization algorithm has been used. This algorithm performs two test: short and the longer voltage generated by the PWM inverter. The used speed estimation algorithm is based on stator flux vector and torque angle estimation and does not operate accurately around zero speed region. However, it allows robust start and closed speed operation in the speed range above 10% of nominal speed. The effectiveness of DTC-SVM with and without motion sensor has been proved by simulation and experimental results (see Chapter 7) 136
DSP implementation of DTC-SVM control Chapter 7 DSP IMPLEMENTATION OF DTC-SVM CONTROL 7.1 Description of the laboratory test-stand The basic structure of laboratory setup is presented in Fig. 7.1 and the photo of laboratory setup is shown in Fig. 7.2. The motor setup consists of 3kW permanent magnet synchronous motor and DC motor, which is used as a load. The PMSM machine is supplied by PWM inverter, which is controlled by digital signal processor (DSP) based on DS1103 board. The voltage inverter is supplied from three-phase diodes rectifier. The DSP interface is used in order to separate the high power from the low power circuit (computer part). Please note that the DS1103 is inserted inside the PC computer. Figure 7.1. Block scheme of laboratory setup. Figure 7.2. Laboratory setup. 1-voltage inverter, 2-control for DC motor, 3- PMSM machine, 4 – DSP interface. 137
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POLITECHNIKA WARSZAWSKA WARSAW UNIV
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Contents Table of Contents Chapter
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Introduction Chapter 1 INTRODUCTION
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Introduction to surface-mounted mac
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Introduction vector control, which
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Introduction presented and studied.
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Modeling and control modes of PM sy
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Voltage source PWM inverter for PMS
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Control methods of PM Synchronous m
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Direct Torque Control with Space Ve
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Page 167 and 168: Appendices APPENDICES A1 Rotor and
Page 169 and 170: Appendices ⎡ ⎤ ⎢ 1 0 ⎥ ⎡K
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Page 173 and 174: Appendices A7 PWM technique - six s
Page 175 and 176: List of symbol List of symbols Symb
Page 177 and 178: References Books and PhD-Thesis 1.
Page 179 and 180: References 39. J.-I. Itoh, N. Nomur
Page 181 and 182: References 74. N. Ertugrul, P. Acar
Page 183 and 184: References 108. D. Świerczyński,
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