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

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Summary and closing conclusion • position of PM flux has to be known prior to start up to achieve smooth operation. Therefore, for robust starting of PMSM without the temporary rotor reversal a simple initialization algorithm has been used. This algorithm performs two tests: short and the longer voltage pulses 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 in zero speed region. However, it allows robust start and closed speed operation in the speed range above 10% of nominal speed. For application where high performance operation around zero speed are required, the DTC-SVM drive with motion sensor (encoder) is recommended. The effectiveness of DTC-SVM scheme with and without motion sensor has been proved by simulation and experimental results (Chapter 7). Simulation study and experimental results have shown that from two variants of DTC- SVM schemes the parallel structure is more flexible in torque and flux controller design. Also, because of lack of the differentiation in the main control path (compare Fig. 5.2 and Fig. 5.25), it is less sensitive to noise which inherently associates signal processing in power electronic converters. Therefore, the parallel structure has been selected for industrial manufacturing and implemented on digital signal processor (DSP). Thanks to direct torque and flux control structure the described control is suitable to almost all – industrial applications including electrical vehicles (for example hybrid cars). Finally, it should be stressed that the developed system was brought into serial production. Presented algorithm DTC-SVM has been used in new generation of inverter drives produced by Polish company Power Electronic Manufacture – “TWERD”, Toruń. 162
Appendices APPENDICES A1 Rotor and stator of PMSM machine A1.1. View of rotor (on the left side) and stator armature (on the right side) of PMSM. A2 Basic transformation y β K B K θ K K β K y K x K α θ K α x K A K C Fig. A2.1. Space vector representation in stationary α, β coordinates and synchronous rotating x, y coordinates. A, BC , ⇒ xy , 2 Kx = [ KA cos θ K + KB cos(2 π / 3 − θK ) + KC cos(2 π / 3 + θK )] 3 2 Ky = [ KA cos( π /2 + θK ) + KB cos(2 π /3 − ( π /2 + θK )) + KC cos(2 π /3 + π /2 + θK )] 3 163
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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 183 and 184: References 108. D. Świerczyński,
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Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

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