Title :
Modeling and experimental analysis of a Coupling Inductor employed in a high performance AC power source
Author :
Boillat, David O. ; Kolar, Johann Walter
Author_Institution :
Power Electron. Syst. (PES) Lab., ETH Zurich, Zurich, Switzerland
Abstract :
A large number of papers regarding Coupling Inductors (CIs) for interleaved parallel connected converter stages is available in literature. However, to the knowledge of the authors, a comprehensive summary of the basics and a description of the modeling and the experimental analysis, as well as the conditions which must be satisfied to avoid saturation of the CI´s core are still missing. This paper intends to close this gap partially based on research conducted on a multi-phase 3-level voltage source converter which is intended to be employed as a high performance AC power source. The main focus of the investigations is on CIs with high coupling factors k ≈ 1. Besides a detailed CI literature review, the focus is on the modeling of the component itself and on the analysis of the requirements for the targeted application. The separation of the coupling inductor currents and bridge-leg output voltages into longitudinal and transverse components is introduced to illustratively explain the CI´s behavior. A complete investigation to avoid saturation in all operating conditions is conducted. Finally, the derived theoretical analysis and their conclusions are successfully verified by extensive measurements on a phase leg of a 10 kW 3-level voltage source converter prototype.
Keywords :
power convertors; power inductors; CI behavior; CI saturation; bridge-leg output voltages; coupling inductor currents; coupling inductor modelling; high coupling factors; high performance AC power source; interleaved parallel connected converter stages; longitudinal components; multiphase 3-level voltage source converter; power 10 kW; transverse components; Couplings; Equivalent circuits; Inductance; Inductors; Magnetic circuits; Switches; Windings; 4-Phase High Performance AC Power Source; Coupling Inductor; Longitudinal Current Component; Symmetric Core Magnetization; Transverse Current Component; Two-Stage LC Output Filter;
Conference_Titel :
Renewable Energy Research and Applications (ICRERA), 2012 International Conference on
Conference_Location :
Nagasaki
Print_ISBN :
978-1-4673-2328-4
Electronic_ISBN :
978-1-4673-2329-1
DOI :
10.1109/ICRERA.2012.6477401