Kolloquiumsvortrag: Prof. Carlo Cecati, Chief of IEEE Transactions Industrial Electronics
21.07.2014 von 17:15 bis 18:30
Institut für Elektrotechnik und Informationstechnik, Kaiserstr. 2, Raum: "Aquarium" Geb. D
Titel:
Optimization of conversion of energy produced by
renewable energy
Abstract:
The speech, after a general overview of the researches underway, will be focused on three distinct topics, in the field of harmonics elimination in multilevel converters and non linear control of LLC DC/DC resonant converters and modeling of SiC devices. These topics have a common factor which is the optimization of conversion of energy produced by renewable energy. With reference to first part of presentation, Selective Harmonic Elimination (SHE) and Selective Harmonic Mitigation (SHM) have recently attracted the attention of several researchers over the world, due to clear advantages deriving by elimination of low order harmonics without use of passive filters. The speech will introduce some full analytical procedures for computation of all valid pairs of switching angles used for pattern generation in five-levels H-Bridge cascaded inverters and aiming at removing a single harmonic (SHE) or a group of harmonics (SHM). The exact solutions are given for modulation angles, which is a unique features of the developed methods. Another part of the speech will deal with the use of Extended Describing Functions (EDF) in control of LLC DC/DC resonant converters operating under wide input voltage and load variations. A nonlinear model for the converter was developed using the EDF method; then, based on the derived model, a nonlinear observer-based controller was designed and implemented using a Digital Signal Processor (DSP). Obtained transient experimental responses, under disturbances from both the output and the input, show that the proposed controller is capable to stabilize the output effectively even in case of large input/output variations.Finally, in view of development of high efficiency power converters, a Simulink model of Silicon Carbide devices has been developed, obtaining a library block capable of precise simulation of next generation power converters.