7-Level Asymmetrical Hybrid Cascaded Multilevel Converter Topology for Traction System - 2017


Electrified traction system connected to the medium voltage high power achieve great attention thanks to its high potency. However the traditional topologies used in electrified traction system causes power quality problems like high harmonics distortion, low power issue on ac line due to the non linear nature of the load. To address the said problems, this paper presents a topology of seven-level asymmetrical cascaded converter primarily based on the series connection of cascaded module of 5 levels converter (CM), with H-bridge cell to satisfy the demand of traction application with improved power factor at minimum harmonics distortion. The proposed topology consists of one dc source and two dc-link capacitors to obtain the need level of output with minimum power switches. Harmonics compensation is achieved by providing H-bridge cell and cascaded module with a gating signal at elementary frequency and high switching frequency respectively. Working principle of proposed topology, mathematical analysis, controlled PWM strategy, stability downside connected to dc-link capacitor voltage, doable suggests that of balancing and results has been fully investigated with the help of simulation.

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