Three-Phase Sinusoidal Output Buck-Boost GaN Y-Inverter for Advanced Variable Speed AC Drives
- Journal Article
Motor drive systems supplied by a fuel-cell/battery are especially demanding when it comes to the design of the inverter. Besides a high performance (high efficiency eta and power density rho), the inverter has to cope with the wide dc voltage variation of the fuel-cell/battery that supplies the motor drive. A promising three-phase inverter topology, denoted as Y-voltage source inverter (VSI), is presented in this article. The Y-VSI is a modular three-phase inverter and comprises three identical phase-modules connected to a common star "Y" point. Each phase-module is equivalent to a buck-boost dc/dc converter, which allows the ac output voltages to be higher or lower than the dc input voltage. Thereby, the Y-VSI effectively copes with the wide variation of the fuel-cell/battery voltage. Each phase-module can he operated in a similar fashion to a conventional dc/dc converter, independently of the remaining two phases. Accordingly, a straightforward and simple operation/control of the Y-VSI is possible. In addition, the Y-VSI features an integrated output filter. This allows for continuous/sinusoidal motor voltage waveforms, eliminating the need for an additional filter between the inverter and the motor. This article details the operating principle of the Y-VSI and comparatively evaluates two modulation strategies. In order to validate the proposed concepts, a Y-VSI hardware prototype is assembled within the context of a high-speed motor drive. In the investigated drive system, a fuel-cell supplies the Y-VSI, which in return controls a 280-kr/min 1-kW electric compressor. The Y-VSI hardware prototype is compared against a state-of-the-art hardware prototype, which features two energy conversion stages. It is shown that the Y-VSI is Delta eta = +2.3% more efficient and at the same time Delta rho = +10% more power dense compared with the conventional inverter solution. Show more
Journal / seriesIEEE Journal of Emerging and Selected Topics in Power Electronics
Pages / Article No.
SubjectBattery; control system; drive system; fuel-cell; high-speed; inverter
Organisational unit03573 - Kolar, Johann W. / Kolar, Johann W.
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