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

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DSP implementation of DTC-SVM control Figure 7.37. Experimental response to load torque step change of PMSM motor controlled via DTC-SVM with the estimated speed signal taken to the feedback at Ω = 1500rpm . ( M = 0Nm → 10Nm ). From the top: 1- reference speed (900rpm/div), 2- measured speed l (900rpm/div), 3 - electromagnetic torque (10Nm/div), 4- motor phase current (10A/div). m Experimental results presented in Figures 7.31-7.37 confirm very well the effectiveness of speed estimation algorithm of speed control loop for parallel DTC-SVM structure. 160
Summary and closing conclusion Chapter 8 SUMMARY AND CLOSING CONCLUSIONS This thesis studied basic problems related to selection, investigation and implementation of the PWM inverter-fed permanent magnet synchronous motor (PMSM) drives suitable for serial manufacturing. The selected method should provide: robust start and operation in wide speed control range including zero speed, with and without mechanical motion sensor; guarantee good and repeatable parameters of PMSM drive for wide power range (1-100kW). The control and protection algorithm should be implemented in simple and cheap microprocessor. To solve so formulated general task several related problems had to be solved. At first, the space vector based mathematical description and static characteristic of PMSM under different control modes were studied (Chapter 2). Secondly, the three phase voltage source inverter model including nonlinearities (dead time, semiconductor voltage drop, DC link pulsation) and pulse with modulation PWM techniques were presented (Chapter 3). Next, based on the study of most important high performance control methods as field oriented control (FOC), and direct torque control (DTC), the method called direct torque control with space vector modulator (DTC-SVM) has been selected for further consideration (Chapter 4). This methods combines main advantage of FOC (space vector modulator and fixed switching frequency) and DTC (simple structure, rotor parameter independent), as well as eliminates disadvantages like: coordinate transformation, the need of internal current control loops, high sampling time, high torque and current ripple at steady state operation, etc. Consequently the most important contribution of this thesis is included in the Chapter 5, where the two basic variants of DTC-SVM schemes: series (cascade) and parallel structures of flux and torque controllers are presented (Fig. 5.2 and Fig. 5.25). Also, a systematic methodology of digital controller design for these both DTC-SVM variants have been given. This methodology has been verified by Simulink (using simplified discrete transfer function) and Saber (using full motor and inverter model) simulation studies. The influence of sampling time selection on controller design has also been discussed. The main problems associated with PMSM sensorless speed operation are presented in the Chapter 6. It should be noted that PMSM differ from IM drives mainly in: • PMSM parameters strongly depend on construction , 161
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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
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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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