Analysis of Control and Modulation Techniques in Small-Scale DC-to-AC Five-Level Inverter Based on Multilevel Modular Converter
With higher integration of variable generation such as renewables, high-voltage direct-current (HVDC) transmission and conversion plays an important role in interfacing and synchronizing power transmission. Traditionally, two-level converters are used to interface AC and DC connections. However, the two-level converter has limitations when scaling to high-voltage systems. There exists several multilevel converter topologies to overcome these limitations.
The multilevel modular converter (MMC) topology has been gaining recent popularity for its high scalability, redundancy, and low distortion compared to two-level converters. One of the main topics in MMCs is the voltage balancing of submodules in the topology. Due to the submodules’ configuration and unequal switching times, a control loop is required to balance the capacitor voltage in each submodule to reduce harmonic distortion. In this project, a small-scale five-level inverter based on the MMC is built to empirically test multiple modulation and control techniques. The output performance of each configuration is compared to each other and to simulations.
Major Advisor: Don Heer
Committee: Eduardo Cotilla-Sanchez
Committee: Matthew Shuman
Monday, June 4, 2018 at 2:00pm to 4:00pm
Kelley Engineering Center, 1007
110 SW Park Terrace, Corvallis, OR 97331
Calvin Hughes
5417373617
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