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

More documents

Recommendations

Info

Direct Torque Control with Space Vector Modulation • increment of torque angle ∆δ Ψ coming from torque control loop (see Fig.5.2.) is equal zero. It means that the torque is not produced, • stator flux vector position θ Ψ s and rotor flux vector position θ r are equal zero. It corresponds to situation, where the those two flux vectors lie along the α axis. In this special case the reference stator flux amplitude Ψ _ =Ψ α _ can be controlled s ref s ref trough the reference stator voltage component U α _ = U _ , when the voltage drop on the s ref s ref stator resistances in α, β axes are neglected (see Fig. 5.5). Therefore, the simplified flux control loop can be shown in Fig. 5.6. Ψ =Ψ α s _ ref s _ ref s sα Ψ =Ψ − ∆Ψ sα controller P U sα _ ref = Us _ ref U β = s _ ref 0 PMSM Ψ sα Ψ sβ Continuous s-domain Figure 5.6. Simplified flux control loop in α, β coordinates. Simplified flux control loop in s domain is shown in Fig. 5.7, where CΨ ( s) is a transfer function of the P controller given by: CΨ() s = KpΨ (5.11) The transfer function between stator flux amplitude Ψ s =Ψ sα and stator voltage amplitude U s can be expressed as: G Ψ Ψ s 1 () s = = (5.12) U s s 70
Direct Torque Control with Space Vector Modulation Control Plant P controller Ψ s_ref C Ψ () s U s G Ψ () s Ψ s Figure 5.7. Block diagram of flux controller in s domain. Hence the transfer function of the closed stator flux amplitude control loop is obtained as: G Ψ _ closed Ψ s () s _ ref CΨ() s GΨ() s () s = = Ψ () s 1 + C () s G () s s Ψ Ψ (5.12) Substituting transfer function for CΨ ( s) and GΨ ( s) one becomes: ⎛1⎞ ⎛1⎞ KpΨ⎜ ⎟ KpΨ⎜ ⎟ s s K p GΨ _ closed () s = ⎝ ⎠ = ⎝ ⎠ = ⎛1 ⎞ s+ KpΨ s+ K 1+ K pΨ ⎜ ⎟ ⎝s ⎠ s Ψ pΨ (5.13) Discrete design The transfer function for P controller in discrete system is expressed as: CΨ( z) = KpΨ (5.14) Ψ s_ ref( z) C Ψ ( z) U = sα U s Dz ( ) z −1 GΨ ( z) } ZOH 1 s Ψ s ( z) Figure 5.8. Block diagram of flux controller in discrete domain. Where, CΨ ( z) is discrete transfer function for P controller, Dz ( ) delay for voltage generation from PWM . 1 z − is for one sampling time 71
Page 1 and 2:
POLITECHNIKA WARSZAWSKA WARSAW UNIV
Page 3 and 4:
Contents Table of Contents Chapter
Page 5 and 6:
Introduction Chapter 1 INTRODUCTION
Page 7 and 8:
Introduction to surface-mounted mac
Page 9 and 10:
Introduction vector control, which
Page 11 and 12:
Introduction presented and studied.
Page 13 and 14:
Modeling and control modes of PM sy
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24: 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 69 and 70: Direct Torque Control with Space Ve
Page 73: Direct Torque Control with Space Ve
Page 125 and 126:
Sensorless Speed Direct Torque Cont
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
DSP implementation of DTC-SVM contr
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Summary and closing conclusion Chap
Page 167 and 168:
Appendices APPENDICES A1 Rotor and
Page 169 and 170:
Appendices ⎡ ⎤ ⎢ 1 0 ⎥ ⎡K
Page 171 and 172:
Appendices i(t1->t0)+=it1 it1: it1=
Page 173 and 174:
Appendices A7 PWM technique - six s
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,
show all

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

Create successful ePaper yourself

Delete template?

Save as template?