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

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Direct Torque Control with Space Vector Modulation 5.5 Summary This Chapter presents design of discrete control loops for two DTC-SVM schemes: series (cascade) and parallel structures of flux and torque controllers, Fig. 5.2 and Fig. 5.25, respectively. The cascade structure operates with P-flux controller and PItorque controller whereas in parallel structure two PI controllers are used. In the first step of design calculation of discrete Z- transfer function from continuous s- domain transfer function using zero order hold (ZOH) method of discretization has been performed. The continuous PI controller transfer function has been discretized using backward difference approach. Secondly, a SISO tool from Matlab package for digital controller parameter calculation has been applied. The results of design were verified by Simulink (using simplified discrete transfer function) and Saber (using full motor and inverter model) simulation. Also, the influence of sampling time selection on controller parameters have been discussed. Finally, also the speed control loop was synthesized using similar methodology. 120
Sensorless Speed Direct Torque Control with Space Vector Modulation (DTC-SVM) Chapter 6 DIRECT TORQUE CONTROL WITH SPACE VECTOR MODULATION (DTC- SVM) OF PMSM DRIVE WITHOUT MOTION SENSOR 6.1 Introduction Many motion control applications, such as material handling, packaging and hydraulic or pneumatic cylinder replacement, require the use of a position transducer for speed or position feedback, such as an encoder or resolver. In addition, permanent magnet synchronous motors require position feedback to perform commutation. Some of systems utilize velocity transducer as well. These sensor add cost, weight, and reduce the reliability of the system. Also, a special mechanical arrangement needs to be made for mounting the position sensors. An extra signal wires are required from the sensor to the controller. Additionally, some type of position sensors are temperature sensitive and their accuracy degrades, when the system temperature exceed the limits. Therefore, the research in the area of sensorless speed control of PMSM is beneficial because of the elimination of the feedback wiring, reduced cost, and improved reliability. Sensorless speed DTC-SVM control block scheme is presented in Fig. 6.1. Figure 6.1. Block scheme of DTC-SVM for PMSM drive without motion sensor. As we can see the operation of speed controlled PMSM drive without mechanical motion sensor is based only on measurement of following signals, which are available in every PWM inverter-fed drive system as: • DC link voltage, • motor phase currents, 121
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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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Direct Torque Control with Space Ve
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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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