Unit 1 Multi-pulse converters

9 lecture hours

• Concept of multi-pulse
• Multi-pulse diode rectifier
• Multi-pulse SCR converters (rectifiers) Need for Phase Shifting Transformer
• Phase shifts with Y-Z and Δ-Z transformer configurations
• Delta-Polygon and Fork type configurations
• Analysis to determine phase shift and current waveforms
• Harmonic Current Cancellation
• Applications of multi-pulse converters

Unit 2 Multi-level Voltage Source Inverters

11 lecture hours

• Review of Two-level VSI, Concept of multi-level
• Need for multi-level inverters Cascaded Multi-level Inverter
• Operation with equal and unequal DC sources
• Carrier based PWM Control Strategy Diode Clamped multi-level inverter configurations
• Space Vector Modulation (for 3-level and higher level)
• Even Order Harmonic Elimination
• Effect on Neutral Point Voltage
• Regulation of Neutral Point Voltage
• Carrier Based Control Schemes
• Other Multilevel Inverter Configurations like Flying Capacitor
• NPC-Hybrid etc
• Features and relative comparison of these configurations

Unit 3 PWM Current Source Inverters

6 lecture hours

• PWM current source inverter configuration
• Trapezoidal modulation
• Selective harmonic elimination
• Space vector modulation Parallel connection of CSI for high power rating
• Control of parallel connected CSI

Unit 4 Matrix converters

• Fundamentals of matrix converter technology
• Conventional Matrix Converter
• Bi- directional switch topologies
• Modulation techniques for matrix converters
• Performance and control of matrix converters
• Commutation and protection issues
• Concept of Direct 6 Subject Code: 3720731 w.e.f