Unit 1 Multilevel Inverters

12 lecture hours

• • Introduction – Concept – Principle of Operation – Classification – Advantages & Disadvantages – Applications • Diode Clamped MLI: Three-Level Inverter – Converter Configuration – Switching State – Commutation – Causes of Neutral-Point Voltage Deviation – Effect of Motoring and Regenerative Operation – Feedback Control of Neutral-Point Voltage – Five-Level Diode-Clamped Inverters • Cascaded H-Bridge MLI: Bipolar and Unipolar Pulse-Width Modulation – CHB Inverter with Equal and Unequal DC Voltage – Carrier Based PWM Schemes: Phase-Shifted and Level-Shifted Multicarrier Modulation – Comparison – Staircase Modulation • Flying Capacitor MLI: Inverter Configuration – Modulation Schemes – Capacitor Voltage Unbalance • Review of PWM techniques
• SVPWM – Switching States – Space Vectors – Dwell Time Calculation – Modulation Index – Over-modulation – Switching Sequence – Even-Order Harmonic Elimination

Unit 2 Resonant Converters

• 8 Subject Code: 3172418 w.e.f
• AY 2018-19 • Introduction – Classification – Resonant Switch: ZC and ZV • Concept of Soft Switching – Quasi Resonant Converters – Comparison between ZVS and ZCS • ZVS in High-Frequency Applications • Load Resonant Converters – Series Resonant Converters – Parallel Resonant Converters – Series-Parallel Resonant Converters • Basic Control Circuits for Resonant Converters – Snubbers • Soft Switching DC-AC Power Inverters

Unit 3 Multi-pulse Converters

9 lecture hours

• • Multi-Pulse Diode Rectifiers – Six Pulse Diode Rectifiers – Series Type and Separate Type Multi-Pulse Diode Rectifiers. • Multi-pulse SCR Rectifiers – Six Pulse SCR Rectifier – Twelve Pulse SCR Rectifier – Introduction to 18 and 24 Pulse SCR Rectifiers. • Phase Shifting Transformers – Introduction –Transformer connections-Y/Z Phase Shifting Transformers – Δ/Z Transformers – Harmonic Current Cancellation

Unit 4 Switched Capacitor DC-DC Converters

8 lecture hours

• • Step Down Converter – Step Up Converter – Voltage Polarity Inverting Converter – N-Stage Step Up Converter – N-Stage Step Down Converter
• • Bi-Directional Power F1ow SCC – Switched Capacitor Luo Converter – Losses on Switched Capacitor Power Converter

Unit 5 Cycloconverters and Matrix Converter

8 lecture hours

• • Single Phase-Single Phase Cycloconverter – Three Phase Cycloconverter – Cycloconverter Control Scheme - Forced-Commutated Cycloconverter (FCC) - Applications of Cycloconverters – Concept of AC Choppers • Matrix Converter – Introduction – Operation and Control Methods of the Matrix Converter: Venturini Method and SVM Method –Comparison of the Two Methods – Commutation and Protection Issues in a Matrix Converter – Applications of Matrix Converters