In this dissertation, two high-frequency (HF) transformer isolated single-stage
integrated ac-dc converters are proposed for a small scale permanent magnet
synchronous generator (PMSG) based wind energy conversion system (WECS).
These two types of single-stage integrated ac-dc converters include expected
functions of HF isolation, power factor correction (PFC), and output regulation in one single-stage. Fixed-frequency phase-shift control and soft-switching operation are
employed in both proposed ac-dc converters.
After reviewing the literature and discussing pros and cons of the existing
topologies, it is preferred that three identical single-phase single-stage integrated
converters with interleaved connection configuration are suitable for the PMSG. For
the single-phase converter, two new HF isolated single-stage integrated resonant
ac-dc converters with fixed-frequency phase-shift control are proposed. The first
proposed circuit is HF isolated single-stage integrated secondary-side controlled ac-dc
converter. The other proposed circuit is HF isolated single-stage dual-tank LCL-type
series resonant ac-dc converter, which brings better solutions compared to the first
converter, such as high power factor and low total harmonic distortion (THD) at the
ac input side. Approximate analysis approach and Fourier series methods are used to
analyze these two proposed converters. Design examples for each one are given and
designed converters are simulated using PSIM simulation package. Two experimental
circuits are also built to verify the analysis and simulation. The simulated and
experimental results reasonably match the theoretical analysis.
Then the proposed HF isolated dual-tank LCL-type series resonant ac-dc converter
is used for three-phase interleaved connection in order to satisfy requirements of
PMSG based WECS. A design example for this three-phase interleaved configuration
is given and simulated for validation under several operating conditions. / Graduate / 0544 / duyimian@uvic.ca
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/5138 |
| Date | 06 January 2014 |
| Creators | Du, Yimian |
| Contributors | Bhat, Ashoka Krishna Sarpangal |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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