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

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Control methods of PM Synchronous motor y moment with active forward vector stops with zero vector Ψ s moment with active backward vector γ s δ Ψ Ψ =Ψ r PM x rotates continuously α stator Figure. 4.7 Stator flux vector Ψ s movement relative to rotor flux vector Ψ r =ΨPM under the influence of active and zero inverter voltage vectors. Therefore, it is possible control the torque angle δ Ψ across control stator flux vector position in respect to rotor flux vector produced by permanent magnet Ψ r =Ψ PM Ψ s , what further allows to have impact on control the electromagnetic torque in accordance with following formula: M e 3 Ψ sin 2 s ΨPM δΨ Ψs ( Lq −Ld)sin2δ Ψ = pb[ − ] (4.3) 2 L 2L L d d q Generally the DTC technique operate at constant stator flux amplitude Ψ s , what correspond to CSF operation, because of simple reference stator flux amplitude equal nominal value of permanent magnet. For DTC technique can be also apply all control strategies discussed in Chapter 2. Using the block generator for reference stator flux amplitude and electromagnetic torque as is shown in Fig 4.8. it is possible to draw the relationship between required Reference Flux Calculation reference flux Ψ s _ ref M e_ ref reference torque reference torque M e _ ref Figure 4.8. Reference flux and torque generator block for DTC technique. reference flux and torque. His graphical illustration in Fig. 4.9 is presented. 58
Control methods of PM Synchronous motor Ψ sN [ pu] 2 1.5 1 CTA MTPA CSF 0.5 UPF 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 M eN [ pu] Figure 4.9. Generated stator flux amplitude Ψ s _ ref dependent on required electromagnetic torque under difference control strategies. CTA-constant torque angle control, MTPA-maximum torque per ampere control, CSF-constant stator flux control, UPF – unity power factor control. The basic structure of direct flux and torque control voltage-sourced PWM inverter-fed permanent magnet synchronous motor is shown in Fig.4.10.[3,36,37,41,45] Flux hysteresis U DC Ψ s _ ref M e _ ref − − H Ψ s H m d Ψ s d M e Switching Table Torque sector γ histeresis s ( N ) S A S B S C Inverter Ψ s M e Flux and Torque Estimation I s γ m PMSM Figure. 4.10. Block diagram of switching table based direct torque control ST-DTC. The command stator flux amplitude Ψ s _ ref and electromagnetic torque e_ ref M values are compared with the actual Ψ s and M e values, in hysteresis flux and torque controllers, respectively. The flux and the torque controllers are a two-level comparators. The digitized outputs signals of the flux controllers are defined as: d = 1 (increase flux) for Ψ > Ψ _ + (4.4a) Ψ s s s ref H Ψ d = 0 (decrease flux) for Ψ < Ψ _ − (4.4b) Ψ s s s ref H Ψ 59
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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
Page 11 and 12: Introduction presented and studied.
Page 13 and 14: Modeling and control modes of PM sy
Page 39 and 40: Voltage source PWM inverter for PMS
Page 57 and 58: Control methods of PM Synchronous m
Page 61: Control methods of PM Synchronous m
Page 69 and 70: Direct Torque Control with Space Ve
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Direct Torque Control with Space Ve
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Sensorless Speed Direct Torque Cont
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DSP implementation of DTC-SVM contr
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Summary and closing conclusion Chap
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Appendices APPENDICES A1 Rotor and
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Appendices ⎡ ⎤ ⎢ 1 0 ⎥ ⎡K
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Appendices i(t1->t0)+=it1 it1: it1=
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Appendices A7 PWM technique - six s
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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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