72651 - Power Converters for Renewable Energy Systems (2nd cycle)

Learning outcomes

Basic of electromechanical energy conversion, electrical machines and drives. Power electronics for electric energy conversion with particular reference to renewable energy sources.

Course contents

Power Electronics

• Review of most common power electronic devices for static energy conversion: Diodes, MOSFET, IGBT.
• Configurations of basic DC / DC converters: buck, boost, buck-boost, flyback, forward.
• Modulation Technique for PWM DC / DC converters.
• Advanced configuration for DC / DC converters: half-bridge and full bridge, and flyback.
• Voltage and current regulation on DC / DC converters.
• Uncontrolled diode rectifier AC / DC.
• Single-phase inverters, PWM control technique.
• Three-phase inverters,  PWM control technique. Principle of current control.

Electromechanical Energy Conversion

• Principles of electromechanical energy conversion.
• DC machine. Torque expression. Mechanical characteristic. Motor and generator operation. Principle of torque and speed control.
• Synchronous machine.  Torque expression. Motor and generator operation at constant and variable speed.
• Induction machine. Torque expression. Mechanical characteristic. Motor and generator operation

 Applications

• Power control in doubly fed induction machines.
• Power control in synchronous and brushless machines.
• Principles of wind energy conversion. Conventional wind energy conversion systems. Micro-wind systems. Power grid connection.
• Overview of photovoltaic energy conversion systems. Structure of a photovoltaic field. Power converters for grid connection. Advanced photovoltaic technologies.

Readings/Bibliography

The course discusses and summarizes several topics, and therefore handouts prepared by the teacher will be distributed directly to the student. It also reported the following reference text

Power Electronics,  Mohan Ned; Undeland Tore M.; Robbins William P

Control of Electric Machine Drive Systems. Seung-Ki Sul 

Fundamentals of Power Electronics. Robert W. Erickson, Dragan Maksimovic

Power Electronics Handbook  Muhammad Rashid

Grid Converters for Photovoltaic and Wind Power Systems. Remus Teodorescu, Marco Liserre, Pedro Rodríguez.

Teaching methods

The theoretical classes are integrated by references to the real applications.

Assessment methods

Oral examination

Links to further information

http://campus.unibo.it/cgi/lista?annoAccademico=2014&codiceScuola=843884&codiceCorso=8770&codMateria=72651-384741&nav=i#top_documents

Office hours

See the website of Michele Mengoni