Abstract
This paper presents a comparative analysis of a new topology based on an asymmetric hybrid modular multilevel converter (AHMMC) with recently proposed multilevel converter topologies. The analysis is based on various parameters for medium voltage-high power electric traction system. Among recently proposed topologies, few converters have been analysed through simulation results. In addition, the study investigates AHMMC converter which is a cascade arrangement of H-bridge with five-level cascaded converter module (FCCM) in more detail. The key features of the proposed AHMMC includes: reduced switch losses by minimizing the switching frequency as well as the components count, and improved power factor with minimum harmonic distortion. Extensive simulation results and low voltage laboratory prototype validates the working principle of the proposed converter topology. Furthermore, the paper concludes with the comparison factors evaluation of the discussed converter topologies for medium voltage traction applications.
Highlights
An electrified ac railway system, being an energy-efficient and governmentally-friendly medium of mass transportation, achieved great demand in many countries
This paper presents a comparative study of the recently proposed multi-level converters (MLC) converter for the medium voltage-high power traction system which is examined through simulation results
The five-level cascaded converter module (FCCM) which is the origin of the asymmetric hybrid modular multilevel converter (AHMMC) topology contains six power semiconductor switches Q1−6 and two dc-link capacitors Vc1 and Vc2, each of the dc-link is charged to 1/2 E of the dc-bus voltage
Summary
An electrified ac railway system, being an energy-efficient and governmentally-friendly medium of mass transportation, achieved great demand in many countries. Hybrid MLC topologies have been a focus of interest due to substantial advantages which include, a redundant converter design, wide operating range, minimum line harmonics, and improved power factor. Some of these arrangements exist in the literature, such as NPC-H module [14], FC-H module [15], NPC-FC module [16] and H-cascaded module [17]. This paper presents a comparative study of the recently proposed MLC converter for the medium voltage-high power traction system which is examined through simulation results.
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