Modelling and Control of a Multi-Level High Power Inverter

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Dr. Varjasi István
Department of Automation and Applied Informatics

Nowadays the equipment’s energy efficiency is more and more important. Electric motors account for approximately 57 percent of all electrical consumption worldwide. Although variable speed drives use only one-eighth of the energy of equivalent constant speed drives at light load, they only make up 5 percent of the industrial motors deployed today. This 5 percent conserves energy produced by 10 power plants and prevents 68 million tons of greenhouse gases from being emitted every year. So there is a growing need for economical energy consumption and decreasing costs as a result of power electronics.

The subject of this thesis is a model of a high-power (6MW) motor’s medium voltage inverter.

In the first part I present and compare various published solution of multi-level inverters, their advantages and disadvantages.

The next section describes one of the H-bridges controlled by a TMS320F28027 Piccolo processor, and the processor’s special communication algorithm with the FPGA. Then it follows the designed software components of the Piccolo and the FPGA.

In this thesis a protection circuit for a H-bridge is discussed as a solution against a sudden overvoltage or a switch failure. The calculations and the simulation are included, and the measurements of the built circuit are shown.


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