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Selection of suitable PWM switching and control methods for modular multilevel converter drives /
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Date
2014
Author
Çiftçi, Barış
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The thesis focuses on the determination of suitable carrier based PWM switching and control method for modular multilevel converter drives. Characterization of various level-shifted and phase-shifted carrier based PWM methods are provided in terms of switching pulse patterns and resultant voltage waveforms both for N+1 and 2N+1 level output phase voltages. Modular multilevel converter PWM based control approaches are evaluated. Performances of different control methods are given for output harmonics distortion, submodule capacitor voltage ripple, circulating current ac component, efficiency and other criteria under equal switching count principle, for the dc/ac conversion step of a 10MW HVDC transmission system. Moreover, a 9.1MW induction motor drive application is studied from standstill to full speed range, giving attention to low frequency region operation. The study is conducted by means of mathematical analysis of the converter, topological and controller design, and detailed computer simulations.
Subject Keywords
Electric current converters.
,
Pulse-duration modulation.
,
Pulse modulation (Electronics).
URI
http://etd.lib.metu.edu.tr/upload/12618358/index.pdf
https://hdl.handle.net/11511/24363
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Graduate School of Natural and Applied Sciences, Thesis
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B. Çiftçi, “Selection of suitable PWM switching and control methods for modular multilevel converter drives /,” M.S. - Master of Science, Middle East Technical University, 2014.
