8412_slides_topic4

8412_slides_topic4 - Advanced AC Drive Systems Topic 4...

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1 1 EE8412 Advanced AC Drive Systems Topic 4 Voltage Source Inverter Fed Drives ACS1000 MV Drive Source: ABB Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 2 Lecture Topics Steady-state Operation Modes Two-level VSI Fed MV Drives Neutral-point Clamped (NPC) Inverter Fed Drives Cascaded H-Bridge (CHB) Inverter Fed Drives EE8412 Advanced AC Drive Systems Voltage Source Inverter Fed Drives Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
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2 3 Operation Modes for ac motors 1. Constant Flux Operation: V / f = constant 2. Constant Power Operation: V = constant, f = variable 3. Voltage Compensation at low rotor speeds V – stator voltage, f – stator frequency Topic 4 Voltage Source Inverter Fed Drives Steady-state Operation Modes EE8412 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 4 Constant Flux Operation -If Φ > Φ rated , magnetic core will be saturated. - If Φ < Φ rated , rated torque cannot be achieved. Φ – motor magnetic flux (general term) Toque = flux x current (general term) Topic 4 Voltage Source Inverter Fed Drives Steady-state Operation Modes EE8412 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
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3 5 Constant Flux Operation Induced emf in a magnetic circuit: E = 4.44 Φ N f where N – number of turns of the coil Φ = E / ( 4.44 N f ) Φ = const E / f = const V / f = const Topic 4 Voltage Source Inverter Fed Drives Steady-state Operation Modes EE8412 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 6 Constant Flux Operation e T Rated e T Max e T T eMax = constant Topic 4 Voltage Source Inverter Fed Drives Steady-state Operation Modes EE8412 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
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4 7 Constant Power Operation When f > f rated rotor speed n > n rated , but V should be kept const to avoid insulation breakdown Since Φ = E / ( 4.44 N f ) V = const and f Φ Topic 4 Voltage Source Inverter Fed Drives Steady-state Operation Modes EE8412 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4 8 Constant Power Operation e T Rated e T Max e T Topic 4 Voltage Source Inverter Fed Drives Steady-state Operation Modes EE8412 Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
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8412_slides_topic4 - Advanced AC Drive Systems Topic 4...

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