Analytical Modelling of Voltage Balance Dynamics for a Flying Capacitor Multilevel Converter

By Brendan McGrath, D. G. Holmes. 2007 IEEE Power Electronics Specialists Conference, 2007

140 citations recorded by the source corpus.

This paper presents a strategy for the analytic determination of the natural voltage balancing dynamics of flying capacitor converters. The approach substitutes Double Fourier series representations of the PWM switching signals into a nonlinear dynamic circuit model of the converter. The result reduces to a linearised state space model that can be readily solved, with the Fourier solution coefficients defining the state space matrix terms. The solution can be readily developed for converters of any level, and allows rapid analytical investigation of the dynamic (and static) balancing behaviour over a wide range of conditions. Furthermore, the approach allows powerful strategies such as root locus to be used to investigate the converter's performance as a function of changes in parameters such as modulation index and load. The analysis approach has been fully verified by comparing it against experimental results on a low voltage prototype converter.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/0237ff1dedd6e9e14c2f79283f0ac8a7bce5e3c1

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In Control and Systems Engineering

In Electrical and Electronic Engineering

Citations in the corpus

A General Review of Multilevel Inverters Based on Main Submodules: Structural Point of View (2019, background): “TABLE IV SOURCE CONFIGURATION OF THE 3L-FC [96], [97]”
Multilevel Converters: An Enabling Technology for High-Power Applications (2009, background): “In most cases, it suffices to consider only a few terms (one or two harmonics), but sometimes higher order harmonics are necessary to correctly model the dynamics of the system magnitudes [110], [111].”
A New Multilevel Converter Topology With Reduced Number of Power Electronic Components (2012, background): “2151813 allow the switching stresses to be equally distributed between semiconductor switches [8], [9].”
Recent Advances and Industrial Applications of Multilevel Converters (2010, methodology): “In [172], [177] a model and an analytical study on the balancing problem and dynamics of FC is presented.”