A 100 W, 500000 rpm generator/starter for a gas turbine based portable power unit has been constructed. The permanent magnetic synchronous machine has an 8 kHz fundamental frequency and stator inductance of 3 /spl mu/H. The traditional voltage source inverter, VSI, is not an automatic choice for this type of machine due to the very high switching frequencies required. In this paper, voltage and current source topologies are compared for physical size, complexity and efficiency. Three topologies are selected for further investigation: the VSI with external inductances and high switching frequency, the VSI with block commutation and the current source inverter with block commutation. The paper presents the topology comparison, VSI design and experimental performance.
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Zwyssig et al. (2006) studied this question.
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