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Due to ongoing research work, a prototype test rig for testing high speed motors/generators has been developed. Its design is quite unique as the two high speed machines share a single shaft with no support bearings between them. A very high maximum operating speed, up to 80,000 rpm, was required. Because of the need to minimise vibration during operation at very high rotational speeds, rolling bearings...
Recent achievements related to the use of silicon carbide (SiC) devices in wind generation systems (WGSs) are presented in the paper. With applications in WGS, the choice of high-temperature, high-frequency SiC devices reduces the volume and size of power electronic converters, particularly their passive filters which dominate the weigh of the converter. The SiC-based power converters are expected...
Advanced control systems combined with high speed gate driver circuits enable extremely high rate of change of power devices voltages, up to hundreds of kV/us. Short rise times of power devices could cause significant EMC problems, which are unacceptable in majority of power electronics applications. It is known that voltage variations during diode switch-off depend on how long it takes for the charge...
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