ABOUT THE COURSE:The course covers different types of AC-DC converters. The technology of diode and thyristor based rectifiers is quite matured. However, they are slowly getting replaced by PWM converters for newer applications like EV and battery charging with improvement in size and efficiency of the converter. Thus, it is important to study and understand this subject keeping in mind the direction of future development.Both the traditional line commutated rectifiers and the newer generation converters like PFC boost, AC-DC flyback or bridgeless PFC will be covered, with an emphasis for the latter. In addition, modeling and controller design for traditional three phase converter (AC-DC or DC-AC) will be taken up. Lectures will be supported by practical examples and followed by assignments for thorough understanding.All the lectures will be delivered keeping in mind about the need for both UG and PG students. During the initial portion of a specific topic, the basics will be covered which is suitable for both types of students. Further, advanced topics will be introduced.INTENDED AUDIENCE: Students and professionalsPREREQUISITES: A first course (UG level) on power electronics is a pre-requisite.INDUSTRY SUPPORT: Industries that deal with power converters for grid integration like ABB, Siemens, ST Microelectronics etc.

Syllabus

Week 1: Diode and thyristor based rectifiers (single phase and 3-phase) with RL and RC loads, Use of L, C and LC filters, effect of source inductance, continuous and discontinuous conduction.
Week 2:Multi-pulse rectifiers to improve power quality: 6-pulse, 12-pulse or higher pulse rectifiers, transformer configuration, input current analysis, THD and power quality issues.
Week 3:Three phase AC-DC converter (Inverter/ PWM rectifier): steady state analysis, phasor diagram, leading, lagging and unity power factor operation, regenerative mode, Hysteresis control.
Week 4:Three phase grid connected AC-DC converter: space vector, Clarke and Park transformation.
Week 5:Three phase grid connected AC-DC converter: d-q Modeling, small signal analysis.
Week 6:Three phase grid connected AC-DC converter: designing of controller, design example.
Week 7:Single phase AC-DC converter (PFC Boost rectifier): power circuit, steady state analysis, unity power factor operation
Week 8:AC-DC Flyback converter: Basic understanding of DC-DC Flyback converter, power circuit of AC-DC Flyback converter, steady state analysis
Week 9:Bridgeless PFC circuits: circuit topologies, steady state analysis.
Week 10:Three level NPC rectifier, Vienna rectifier: circuit topology, steady state analysis.
Week 11:AC-DC converters for EV chargers- onboard and offboard chargers: topologies, analysis and operational issues, commercial development, future trends.
Week 12:Introduction to converters for battery storage system, conclusion