Committee Chair

Disfani, Vahid R.

Committee Member

Karrar, Abdelrahman A.; Ofoli, Abdul R.

Department

Dept. of Electrical Engineering

College

College of Engineering and Computer Science

Publisher

University of Tennessee at Chattanooga

Place of Publication

Chattanooga (Tenn.)

Abstract

Modular multilevel converter (MMC) stands out among converter topologies for medium/high-power applications. With salient features like modularity and scalability, MMC can meet the requirement of theoretically any voltage level with higher efficiency and superior harmonic performance, using converter components with reduced ratings. Unlike conventional converters, MMC has a higher switching frequency due to its higher number of switching components. While MMC has been mainly considered for transmission-level applications such as HVDC, it still needs improvements for medium-voltage systems and grid integration of distributed energy resources. The contribution of this thesis is twofold. First, modulation techniques are designed to reduce switching frequency through novel advanced submodule sorting algorithms, which provide a level of controllability over two conflicting constraints – switching frequency reduction and capacitor voltage deviation – for HVDC applications. Second, a topology design based on full-bridge submodules is proposed to use MMC in grid integration of solar photovoltaic systems.

Degree

M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.

Date

8-2019

Subject

Power electronics; Electric power systems -- Control; Electric power transmission

Keyword

Circulating current control; Grid integration of distributed energy resources; Model predictive control (MPC); Optimal modulation techniques; Power electronic converters; Renewable energy systems

Document Type

Masters theses

Extent

xv, 120 leaves

Language

English

Rights

Under copyright.

License

http://creativecommons.org/licenses/by-nc-nd/4.0/

Date Available

9-1-2020

Available for download on Tuesday, September 01, 2020

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