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• W2251046770 abstract "Multilevel voltage source inverters have been receiving more and more attention from the industry and academia as a choice for high voltage and high power applications. The high voltage multilevel inverters can be constructed with existing low voltage semiconductor switches, which already have a mature technology for handling low voltages, thus improving the reliability of the overall inverter system. These multilevel inverters generate the output voltage in the form of multi-stepped waveform with smaller amplitude. This will result in less dv/dt at the motor inputs and electromagnetic interference (EMI) caused by switching is considerably less. Because of the multi-stepped waveform, the instantaneous error in the output voltage will be always less compared to the conventional two-level inverter output voltage. It will reduce the unwanted harmonic content in the output voltage, which will enable to switch the inverter at lower frequencies. Many interesting multi level inverter topologies are proposed by various research groups across the world from industry and academic institutions. But apart from the conventional 3-level NPC and H-bridge topology, others are not yet highly preferred for general high power drives applications. In this respect, two different five-level inverter topologies and one three-level inverter topology for high power induction motor drive applications are proposed in this work. Existing knowledge from published literature shows that, the three-level voltage space vector diagram can be generated for an open-end winding induction motor by feeding the motor phase windings with two two-level inverters from both sides. In such a configuration, each inverter is capable of assuming 8 switching states independent of the other. Therefore a total of 64 switching combinations are possible, whereas the conventional NPC inverter have 27 possible switching combinations. The main drawback for this configuration is that, it requires a harmonic filter or isolated voltage source to suppress the common mode currents through the motor phase winding. In general, the harmonic filters are not desirable because, it is expensive and bulky in nature. Some topologies have been presented, in the past, to suppress the common mode voltage on the motor phase windings when the both inverters are fed with a single voltage source. But these schemes under utilize the dc-link voltage or use the extra power circuit. The scheme presented in chapter-3 eliminates the requirement of harmonic filter or isolated voltage source to block the common mode current in the motor phase windings. Both the two-level inverters, in this scheme, are fed with the same voltage source with a magnitude of Vdc/2 where Vdc is the voltage magnitude requires for the NPC three-level inverter. In this scheme, the identical voltage profile winding coils (pole pair winding coils), in the four pole induction motor, are disconnected electrically and reconnected in two star groups. The isolated neutrals, provided by the two star groups, will not allow the…" @default.
• W2251046770 created "2016-06-24" @default.
• W2251046770 creator A5001526575 @default.
• W2251046770 date "2011-09-15" @default.
• W2251046770 modified "2023-09-23" @default.
• W2251046770 title "Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells" @default.
• W2251046770 hasPublicationYear "2011" @default.
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