93736 - Power Electronic Converters M

Learning outcomes

The course initially provides supplements of linear and non-linear electric circuits with special emphasis towards power electronic circuits for electric vehicles. The digital controllers for power electronic converters are also examined, such as DSP boards, digital microcontrollers, FPGA systems. The main power electronic switches employed in the electric vehicles are introduced, such as power diodes, Mosfets, IGBTs, SiC and emerging power components. The considered converter configurations, and the corresponding modulation strategies, are: passive and active single-phase and three-phase rectifiers (vehicle power interface with the electric grid), three-phase inverters (vehicle motor drive), dc/dc choppers configurations (on board and off board battery chargers). Battery charging modes for electric vehicles are introduced and duscussed. The features Grid-to- Vehicle (G2V), Vehicle-to-Grid (V2G), Vehicle-to-Vehicle (V2V), Vehicle-to-Load (V2L), and Vehicle-for-Grid (V4G) are considered for the regulation of the power converters, with reference to both off board dc fast charging stations and onboard ac chargers.

Course contents

Module I (30h)

• Supplements of linear and non-linear electric circuits.
• Non sinusoidal periodic waveforms. Current and voltage harmonic distortion and powers in non-sinusoidal steady-state.
• Conduction and commutation losses.
• Power diodes and SCRs. Power electronic switches: BJT, MOSFET, IGBT, emerging components.
• Rectifiers: single-phase and three-phase. PFC single-phase and three-phase (Vienna Rectifier).
• Pulse width modulation (PWM).
• Choppers: buck, boost, buck-boost, Cùk, SEPIC, half-bridge, full bridge.
• Power factor correctors (PFC).

Module II (30h)

• Single-phase inverters: half-bridge and full bridge. Unipolar and bipolar modulation.
• Three-phase inverters: square-wave (six-step), PWM. Common-mode signal injection: centered and discontinuous modulations. Space vector modulation (SVM).
• Multilevel inverters: cascaded H-bridge, Diode clamped (NPC), Flying capacitor.
• Four-wire inverters: split-capacitor inverter, four-leg inverter, independently controlled neutral module.
• Dual-Active-Bridge Converter.
• EV charging standards and considerations.

Readings/Bibliography

• Mohan, Undeland, Robbins: Power Electronics. J.Wiley & Sons
• Rashid: Power Electronics: Circuits Devices and Applications. Prentice Hall
• Kassakian, Schlecht, Verrghese: Principles of Power Electronics. MIT Addison-Wesley

Teaching methods

Classroom lessons (theory and applications on PLECS).

Assessment methods

Written and/or eventually oral exam (interview). Possibility of midterm written exams. A project report is required for Module 2 (more information available on Virtuale).

Students with SLD or temporary or permanent disabilities: it is recommended to contact the responsible University office in good time (https://site.unibo.it/studenti-con-disabilita-e-dsa/en): it will be their responsibility to propose any adaptations to the students concerned, which must however be submitted, 15 days in advance, to the approval of the teacher, who will evaluate the opportunity also in relation to the educational objectives of the course.

Teaching tools

Lesson notes in English. Use of PLECS for circuit simulations.

Office hours

See the website of Riccardo Mandrioli