Advanced Modulation, Control and Application for Multilevel Inverters

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Title: Advanced Modulation, Control and Application for Multilevel Inverters
Author: Liu, Yu
Advisors: Alex Huang, Committee Chair
Hoon Hong, Committee Member
Subhashish Bhattacharya, Committee Member
Mesut Baran, Committee Member
Abstract: LIU, YU. Advanced Modulation, Control and Application for Multilevel Inverters. (Under the direction of Alex Huang.) The purpose of the research has been to develop advanced modulation, control and application for multilevel inverters. A new series of modulations has been proposed to achieve minimal THD (Total Harmonic Distortion) for multilevel inverters. The first minimal THD modulation is a real-time algorithm used to calculate optimal values of switching angles for given DC voltages and a modulation index. The second one is an algorithm used to calculate optimal values of DC voltages and switching angles for a given modulation index. The third one used an algorithm to calculate optimal values of DC voltages, switching angles and a modulation index. Another new optimal combination modulation strategy has been proposed for the 10 MVA 5-level cascade multilevel inverter based STATCOM (Static Synchronous Compensator) system. In this thesis, I also proposed several advanced controls for cascade multilevel inverters to be used in STATCOM applications. A new feedback control strategy for balancing individual DC capacitor voltages is proposed. The key part of the control strategy is a compensator used to cancel the variable parts in the model. I have also proposed the solutions for enhancing ride-through capability of the STATCOM during faults conditions.
Date: 2009-11-13
Degree: PhD
Discipline: Electrical Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/3180


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