A new cascaded asymmetrical multilevel inverter based on switched dc voltage sources
Document Type
Article
Publication Date
6-1-2021
Abstract
Multilevel inverters are now becoming an important element for medium-voltage high-power applications. A low switch count multilevel inverters are currently attracting more attention due to its high efficiency, low cost, and easy control. This paper proposes a new single-phase cascade asymmetrical multilevel inverter topology based on switched dc voltage sources which is capable of achieving a higher number of output levels using fewer number of switches, driver circuits, and dc voltage sources. Other advantages include the inherent generation of negative voltage levels and lower voltage stress across the switches. Three different approaches in selecting the magnitude of the sources for the cascade connection has been included to produce a higher number of voltage levels. Furthermore, the power loss and fault-tolerant analysis of the proposed basic module has also been discussed. To set the benchmark of the proposed multilevel inverter structure, a comparison with several recently proposed topologies is carried out. The comparison has been carried out for the basic module, generalized structure, and cascade connection. The proposed topology gave improved parameters for all three categories. Fundamental switching frequency modulation technique is used to achieve high-quality output voltage waveforms with lower harmonic contents and reduced switching losses. Finally, the operation and performance of the proposed basic module and its cascade connection for two modules are presented together with experimental results in several steady-state and dynamic operating conditions.
Keywords
Multilevel Inverter (MLI), Asymmetrical MLI, Cascaded MLI, Switched dc voltage source, Total Standing Voltage (TSV), Reduced switch count
Divisions
sch_ecs
Funders
Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddha, Saudi Arabia [KEP-Msc-4-135-39],DSR
Publication Title
International Journal of Electrical Power & Energy Systems
Volume
128
Publisher
International Journal of Electrical Power & Energy Systems
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND