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

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Appendices A5 Voltage Source Inverter parameters Detailed date of IGBT transistors (module TOSHIBA M675Q2YS50): U = 1200V , I = 75A CE C UCEsat = 2.8 − 3.6V , forward diode voltage 2.4 − 3.5V Turn on time tON = 0.2µ s, Turn off time tOFF = 0.6µ s Delay of IGBT drivers tONd = 0.5µ s TOFFd = 1µ s TON = tON + tONd = 0.7µ s total turn on time of IGBT TOFF = tOFF + tOFFd = 1.6µ s total turn off time of IGBT Dead time T = 2.5µ s A6 PI speed controller d The commonly used in industrial application speed controller is a Proportional-Integral PI controller thanks to possibility to reduce the speed error between the reference ( and actual rotor speed ( X ref ) X m ) to zero (see Fig. A6.1). The output signal of controller is a reference torque, which has upper and lower limitation for this value equal the nominal torque or more than 130% of nominal torque. The output of the speed controller acts as a current reference command for the current controllers. This current command is limited to a nominal current of the motor. The speed controller demands produce proper electromagnetic torque. X_ ref Reference signal − error signal Kp Y L Controller output a) Feedback signal X_ m Kp T i ∫ X _ ref Reference signal b) − Feedback signal error signal X _ m Kp Kp T i ∫ 1 Y NL lim_max lim_ min − Y E Y L Controller output T i A.6.1. General structure of Proportional- Integral controller without antiwindup (a) and with antwindup (b). 168
Appendices A7 PWM technique – six step mode Six-stepped-voltage waveforms are rich in harmonics. These time harmonics produce respective stator current harmonics, which in turn interact with fundamental air gap flux, generating harmonics torque pulsations. The torque pulsations are undesirable: they generate audible noise, speed pulsations, and losses. In case of supplied motor by using only active vectors (six step mode) we can observed non sinusoidal current, which generates torque ripples with frequency of six time fundamental frequency of supplied phase voltages. Fig. A7.1. Experimental operation in six step mode. From the left side stator voltages in α , β coordinates, From right side voltage trajectory. Fig. A7.2. Experimental operation in six step mode. From the left side stator currents in α , β coordinates, From right side stator current trajectory. 169
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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 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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