Direct Power and Torque Control of AC/DC/AC Converter-Fed ...

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4. Direct Power and Torque Control with Space Vector Modulation – DPTC-SVM due to: the power estimation error, moment of inertia of the rotor and low pass filter in speed control loop, and the saturation of the commanded control variable. ( sT + ) KPU IU 1 U sT IU dcc U dcc + eU dcf U dcf − 1 sT U + 1 M ec Ω m P VSIc = P VSIc2 P + c PVSRc 1 + + 1 sT IT PVSR P cap + − PVSI 1 sCU dcc U dc sT IF 1 + 1 Fig. 4. 4. Block diagram of the AC/DC/AC converter-fed IM with active power feedforward – PF UI 4.3. Simulation Study Investigation of the active power feedforward - PF effectiveness has been carried out in Matlab Simulink in continuous model as well as in SABER discrete model. In this Subsection discrete simulation of the AC/DC/AC converter-fed IM drive will be presented for two modes of operations: • for drives operated with closed torque control loop, • for drives operated with closed speed control loop. 4.3.1. Steady State Performances For verification of the PF impact on the input current steady states operation during motoring and regenerating modes were investigated. The results of this study are presented in following tables (Tab. 4. 1 - Tab. 4. 4). In Tab. 4. 1 THD of the line current under the steady state (at zero speed and zero torque) is presented. 76
4. Direct Power and Torque Control with Space Vector Modulation – DPTC-SVM Tab. 4. 1. THD of the line current under the steady state operation (at zero speed and zero torque) Case K PU = 0. 0056 K PU = 0. 056 PF 0 PF Ω PF UI THD L THD I L [%] 63 64 THD I L [%] 53 60 I [%] 53 50 In Tab. 4. 2 THD of the line current under the steady state (at 71 % of nominal speed and 75% of nominal torque) is presented. Tab. 4. 2. THD of the line current under the steady state operation (at 71 % of nominal speed and 75% of nominal torque) Case K PU = 0. 0056 K PU = 0. 056 PF 0 PF Ω PF UI THD L THD I L [%] - - THD I L [%] 4.3 4.9 I [%] 4.3 5.2 In Tab. 4. 3 THD of the line current under the steady state (at 71 % of nominal speed and -75% of nominal torque) is presented. In this case is a regenerating mode and current flows from the AC/DC/AC converter-fed IM drive to the supply line. Tab. 4. 3. THD of the line current under the steady state operation (at 71 % of nominal speed and -75% of nominal torque) Case K PU = 0. 0056 K PU = 0. 056 PF 0 PF Ω PF THD L UI THD I L [%] 9.9 12 THD I L [%] 9.8 12.6 I [%] 9.8 13 In Tab. 4. 4 THD of the line current under the steady state (100 % of nominal speed and - 100% of nominal torque) is presented. In this case is also regenerating mode. Tab. 4. 4. THD of the line current under the steady state operation (at 100 % of nominal speed and -100% of nominal torque) Case K PU = 0. 0056 K PU = 0. 056 PF 0 PF Ω PF UI THD L THD I L [%] 4.0 4.0 THD I L [%] 4.0 4.0 I [%] 4.1 4.1 77
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POLITECHNIKA WARSZAWSKA WARSAW UNIV
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Acknowledgements The work presented
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Contents 4.2.2. Energy of the DC-li
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Chapter 1 1. Introduction 1.1. AC/D
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1. Introduction Tab. 1. 1. Current
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1. Introduction DC-link voltage to
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1. Introduction then nominal speed
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1. Introduction [69]. From that tim
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Chapter 2 2. Voltage Source Convert
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2. Voltage Source Converters - VSC
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Page 31 and 32: 2. Voltage Source Converters - VSC
Page 39 and 40: Chapter 3 3. Vector Control Methods
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References [18] G. Buja, M. P. Kazm
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References [58] J. G. Kassakian, M.
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References [96] H. Mao, D. Boroyevi
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References [133] A. Tripathi, A. M.
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References [167] M. Jasiński, D.
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Symbols Employed I L - I LA I r - r
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Symbols Employed U pA ,U pB , U pC
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A. Appendices A.1. Space vector in
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Appendices In the special condition
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Appendices A.2. Coordinate Transfor
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Appendices S 3 UI 2 m s * * = = - a
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Appendices Tab. A. 4. 3. Date of th
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Appendices LINE L1 L C F Fig. A. 4.
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Appendices Tab. A. 4. 6. Data of th
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