"This dissertation focuses on two crucial issues in the design and analysis of the power electronic systems on modern all-electric naval ships, i.e., power quality control and stability evaluation. It includes three papers that deal with active power filter topology, active rectifier control, and impedance measurement techniques, respectively. To mitigate harmonic currents generated by high-power high-voltage shipboard loads such as propulsion motor drives, the first paper proposes a novel seven-level shunt active power filter topology, which utilizes tapped reactors for parallel operations of switching devices. The multi-level system has been implemented in both regular digital simulation and real-time digital simulator for validation. In the second paper, a harmonic compensation algorithm for three-phase active rectifiers is proposed. Based on the theory of multiple reference frames, it provides fast and accurate regulation of selected harmonic currents so that the rectifier draws balanced and sinusoidal currents from the source, even when the input voltages are unbalanced and contain harmonics. Extensive laboratory tests on a 2 kW prototype system verifies the effectiveness of the proposed control scheme. The last paper presents a new technique for impedance identification of dc and ac power electronic systems, which significantly simplifies the procedure for stability analysis. Recurrent neural networks are used to build dynamic models of the system based on a few signal injections, then the impedance information can be extracted using off-line training and identification algorithms. Both digital simulation and hardware tests were used to validate the technique"--Abstract, page iv.
Venayagamoorthy, Ganesh K.
Corzine, Keith, 1968-
Chowdhury, Badrul H.
Stutts, Daniel S.
Electrical and Computer Engineering
Ph. D. in Electrical Engineering
National Science Foundation (U.S.)
Naval Surface Warfare Center (U.S.)
United States. Office of Naval Research
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Seven-level shunt active power filter for high power drive systems
- Multiple reference frame-based control of three-phase PWM boost rectifiers under unbalanced and distorted input conditions
- Impedance measurement technique for power electronic systems based on recurrent neural networks
xi, 91 pages
© 2007 Peng Xiao, All rights reserved.
Dissertation - Open Access
Library of Congress Subject Headings
Electric current rectifiers
Electric filters, Wave-guide
Harmonics (Electric waves)
Impedance (Electricity) -- Measurement
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Xiao, Peng, "New techniques to improve power quality and evaluate stability in modern all-electric naval ship power systems" (2007). Doctoral Dissertations. 2221.