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# 8412_slides_topic7 - 1 1 EE8412 Advanced AC Drive Systems...

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Unformatted text preview: 1 1 EE8412 Advanced AC Drive Systems Topic 7 Direct Torque Control (DTC) Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 Source: ABB 2 Lecture Topics • DTC Principle • Switching Logic • Flux and Torque Calculation • Simulation of VSI Drive with TDC • DTC and FOC Comparison EE8412 Advanced AC Drive Systems Direct Torque Control (DTC) Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 2 3 • Motor Torque Topic 7 Direct Torque Control DTC Principle EE8412 T r s r s m e L L L P T θ λ λ σ sin 2 3 = • θ T – torque angle between the stator flux vector and rotor flux vector • T e can be directly controlled by θ T and λ s • The essence of DTC is to control θ T and λ s Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 4 • Principle of DTC Topic 7 Direct Torque Control DTC Principle EE8412 t V ∆ 4 r t V ∆ 1 r t V ∆ 2 r t V ∆ 6 r t V ∆ 5 r t V ∆ 3 r e ω s λ r e ω r λ r t V s s ∆ + = ′ 2 r r r λ λ t V s s ∆ + = ′ 5 r r r λ λ s θ T θ T θ ′ T θ ′ Space vector diagram for two-level VSI ( 7 vectors: V to V 6 ) Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 3...
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8412_slides_topic7 - 1 1 EE8412 Advanced AC Drive Systems...

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