Recently, 3.3 and 6.5 kV power MOSFETs have been introduced . Based on the 3.3 kV device, a 100 A half-bridge power module has been developed , using parallel chips for current scaling and relying exclusively on the use of the transistors body-diode for current free-wheeling (i.e., no antiparallel external diode chips are used). This paper presents a thorough parametric characterization of the module switching performance. Single-chip and parallel-chip operation are investigated in both double-pulsea type tests and realistic singlephase inverter operation.
Access from the University of Nottingham repository:http://eprints.nottingham.ac.uk/40236/1/Performance%20benchmark%20of%20Si%20IGBTs %20vs.%20SiC%20MOSFETs%20in%20small-scale%20wind%20energy%20conversion %20systems.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.
This paper proposes the optimised control and filter design of a 12 kW 3-phase 2-level wind inverter specifically taking into account the intermittent nature of the input power. In particular, the applied control scheme aims at optimising the low-load efficiency, which corresponds to the most frequent operational condition in time, by varying the switching frequency. Specifically, a silicon carbide (SiC) converter is addressed, which operates at relatively high frequency, thus enabling a significant reduction of the filter elements. So, the output filter design also needs to be optimised to ensure that the inverter electro-magnetic performance and the size reduction enabled by SiC are kept. That is achieved by designing a variable inductor based on soft saturation core material.Index Terms-metaloxide semiconductor field-effect transistors (MOSFETs), two-level voltage source converter (2L-VSC), smallscale wind turbine, variable inductor, closed control loop.
This paper proposes the joint electro-magnetic and electro-thermal design optimization of a three-phase twolevel voltage-source inverter, referring to the specific operational conditions of wind power conversion applications. The reference power level is 12 kW and the devices have a nominal voltage rating of 1.2 kV, typical values of small-scale wind turbines. Novel silicon carbide (SiC) devices are used to enable higher switching frequencies and operational temperatures, yielding in turn higher power density, without penalty on efficiency. Specifically, with relevance to commercial products, the paper focuses on the salient features of SiC and discusses their impact on system performance, elaborating on the associated bespoke design needs to yield optimum results in terms of inverter performance and power density, both volumetric and gravimetric. The study is of relevance primarily to on-ground systems, but also includes novel insight and results of straightforward spin-off transfer to a number of transport applications, including upcoming hybrid and fully electric naval and avionic applications.
Taking full advantage of the superior characteristics of SiC Power MOSFETs in the application requires the development of bespoke packaging solutions. Their design needs to thoroughly encompass electromagnetic and electro-thermal aspects to yield major systemlevel benefits. New design approaches are needed in particular for parallel multi-chip structures at higher voltage ratings. With the aim of enabling full exploitation of the disruptive potential of SiC technology, this paper proposes a review of learnings made in the development of SiC bespoke power modules, focusing in particular on module designs compatible with the most widely established manufacturing, converter assembly and thermal management solutions for large volume applications.
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