Συντάχθηκε 25-01-2012 12:09
από Galateia Malandraki
Email συντάκτη: gmalandraki<στο>tuc.gr
Ενημερώθηκε:
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Ιδιότητα: υπάλληλος ΑΡΜΗΧ.
ΠΟΛΥΤΕΧΝΕΙΟ ΚΡΗΤΗΣ
Τμήμα Ηλεκτρονικών Μηχανικών & Μηχανικών Υπολογιστών
ΠΑΡΟΥΣΙΑΣΗ ΜΕΤΑΠΤΥΧΙΑΚΗΣ ΔΙΑΤΡΙΒΗΣ
ΛΑΚΚΑ ΜΑΤΙΝΑΣ
με θέμα
“Design of a high switching frequency FPAG-based SPWM generator for DC/AC inverters”
Παρασκευή 27 Ιανουαρίου 2012, 12μμ
Αίθουσα Συνεδριάσεων, Κτίριο Επιστημών, Πολυτεχνειούπολη
Εξεταστική Επιτροπή
Καθ. Απόστολος Δόλλας (Επιβλέπων)
Επ. Καθ. Ευτύχιος Κουτρούλης
Αν. Καθ. Ιωάννης Παπαευσταθίου
Abstract
With the increasing concern about global environmental protection, the need to produce electric energy using pollution-free methods, such as solar energy, has been drawing increasing interest. In an effort to utilize the solar energy effectively, a great deal of research has been performed on the grid-connected PhotoVoltaic (PV) generation systems. The key element of grid-connected PV systems is the DC/AC inverter, which is used to interface the energy generated by the PV source into the electric grid. The power section of the DC/AC inverter is controlled by a control unit according to the Sinusoidal Pulse Width Modulation (SPWM) principle. The digital SPWM generation unit implementations have dominated over their counterparts based on analog circuits.
In this thesis, an FPGA-based SWPM generator is presented, which is capable to operate at switching frequencies up to 1MHz (requiring FPGA operation at 100-160MHz), thus it is capable to support the high switching frequency requirements of modern power electronic DC/AC converters. The proposed design exhibits architectural flexibility features, enabling the change of the SPWM switching frequency and modulation index either internally, or externally. The proposed SPWM unit has been implemented in a single chip in order to enable the reduction of the DC/AC converter control unit complexity, cost and development time. Thus, the main contribution of this work is a system which is more than an order of magnitude faster in switching frequency vs. previously proposed ones and it has a more flexible architecture which can be tuned to a variety of PV energy production applications. Additionally, compared to the past-proposed designs, the proposed SPWM generation system exhibits less deviation of the generated SPWM output voltage from its theoretical value and consumes less power during operation.
Συνημμένα:
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Lakka_Matina_Anakoinwsi_MSc.doc
Μεταφορτώσεις: 289,
Μέγεθος: 43 KB application/octet-stream
