GIULII CAPPONI FABIO
(programma)
1. Review of electric machines as generators. Asynchronous generators in parallel with the grid and in islanding mode. Synchronous generators. Permanent magnet synchronous generators.
2. Electric energy static conversion. Devices used in power electronic converters. Turn-on and turn-off transients. Losses in power switches. Switching power pole and pulse width modulation.
3. Dc/dc conversion: buck, boost, buck-boost converters.
4. Ac/dc conversion: single-phase and three-phase diode rectifiers. Harmonic distortion and power factor. Power factor correction.
5. Bidirectional switching power pole. Two-quadrant dc-dc converters. Four-quadrant dc-dc converter. H bridge.
6. Dc/ac conversion: single-phase and three-phase inverters. Applications of inverters in variable speed drives. Regenerative braking. Uninterruptible Power Supply (UPS) systems.
7. Connection of inverters in parallel to the grid. Voltage and current harmonics and their mitigation. Control of active and reactive power. Fully bi-directional conversion (back-to-back inverters).
8. Energy conversion from wind. Review of energy extraction principles and of turbine topologies. Fixed-speed energy conversion structures. Variable-speed energy conversion structures: DFIG and full converter schemes. Wind farms.
9. Energy conversion from photovoltaics. Review of energy extraction principles and of PV panels. Power and energy capability. Equivalent circuit of a PV cell. Connection in series and in parallel of PV cells/modules. Energy conversion structures. Maximum Power Point Tracking (MPPT).
Notes from lectures (to be taken by the student)
|