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The integrated gate-commutated thyristor and presspack power diodes have been successfully applied in medium-voltage neutral point-clamped converters in the power range from hundreds of kilowatt to tenths of megawatt. Responsible for driving key processes in the industry, high reliability and availability are crucial for these converters, since their repair or replacement after failure events may...
This paper investigates application of temperature sensitive ferrofluids (TSFF) in the thermal management of electric machines as the cooling and dielectric media for end winding section of these systems. The goal is to exploit the thermal and magnetic characteristics of TSMFs such that not only the fluid will circulate over the end winding of an electric machine, but also existing thermal and magnetic...
The integrated gate commutated thyristor (IGCT) and the press-pack power diodes are successfully applied in medium-voltage Neutral Point Clamped (NPC) converters in the power range from hundreds of kW to tenth of MW. Responsible for driving key processes in various industries, the requirements of reliability and high availability of these converters are absolutely relevant, since its repair or replacement...
Transformer less Intelligent Power Substation (TIPS) is a solid state replacement for the conventional bulky distribution transformers used for 13.8kV and 480V grid interconnectivity. A 100kVA 3L NPC converter is being built using 12kV SiC n-IGBT for the high voltage grid interface. In this paper, detailed thermal behavior of this converter is studied for optimum thermal design. The thermal profile...
Based on work at NC State University, an initial trial group of 15 plug-in hybrid school buses were manufactured by Navistar Corporation to determine basic performance characteristics and provide a basis to improve upon the design. This project was a joint effort with the IC Bus division of Navistar and the many school districts participating in the program. The buses have been in operation for up...
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