Electrical Engineering

FABIO GIULII CAPPONI

basic course in Power Electronics.
basic course in Control Systems.

Basic Operation of Grid-Connected Three-Phase Voltage Source Inverters:
- review of PWM voltage waveforms for a two-level single phase VSI
- review of PWM line to line and phase voltage waveforms for a two-level three phase VSI
- review of carrier-based PWM
- connection to an infinite power grid
- regulation of active and reactive power

Method of Symmetrical Components, Complex Vectors and Reference Frame Transformations:
- review of the definition of phasor
- positive negative and zero sequence phasors
- method of the symmetrical components in the phasor domain
- instantaneous symmetrical components
- complex vector definition, complex vector equivalent circuit of a grid-connected converter, inverse transformation (from the complex vector representation to the abc components)
- stationary reference frame transformations
- synchronous reference frame transformations

Instantaneous Power Theory:
- Basis of the p-q theory
- p-q theory in three-phase, three-wire systems
- p-q theory in three-phase, four-wire systems

PLLs for grid synchronization:
- basic phase locked loops for three-phase grids: stationary and synchronous reference frame PLLs
- PLLs for single-phase grids
- advanced phase locked loops for three-phase grids under unbalanced and distorted conditions

Grid Harmonic Requirements and Grid Filters:
- grid voltage and current harmonic limits in international standards
- filters for grid connected inverters: L filter, LCL filter, LCL filter with damping

Control of Grid-Connected Three-Phase Voltage Source Inverters:
- dq modelling of the two-level three phase VSI
- principles of current regulation assuming a grid-connection with an L filter: synchronous reference frame cross-coupling decoupling current regulator
- DC voltage control
- voltage-oriented p-q control: open loop and close loop implementations.

Applications to PV and Wind Turbine Systems

1. Lecture notes (to be taken by the students)
2. “Grid Converters for Photovoltaic and Wind Power Systems”, R. Teodorescu, M. Liserre and P. Rodríguez, IEEE Wiley 2010;
3. “Instantaneous Power Theory and Applications to Power Conditioning”, H. Akagi, E. H. Watanabe and M. Aredes, IEEE Wiley 2017;
4. “Grid-Side Converters Control and Design” S. Vukosavic -– Ed. Springer

Classes are mainly based on traditional, frontal teaching. Numerical and lab exercises are also held, in order to verify the capability of students to apply the knowledge acquired during classes.

Not mandatory, but highly recommended

A certain number of assignments will be proposed during the course. The students will have to solve them and deliver the solution to the instructor. A discussion of the results will follow during class hours. The assignments are not evaluated.
The evaluation will be made through an oral colloquium, during which the student will demonstrate:
- his knowledge of the topics of the subject,
- his ability to present his speech in a logical and rigorous form, using appropriate terminology,
- his capability to technically discuss and support his statements.