Lifetime as a control variable in power electronic systems

Konferenz: VDE-Kongress 2010 - E-Mobility: Technologien - Infrastruktur - Märkte
08.11.2010 - 09.11.2010 in Leipzig, Deutschland

Tagungsband: VDE-Kongress 2010

Seiten: 6Sprache: EnglischTyp: PDF

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Weckert, Marco; Roth-Stielow, Jörg (Institute of Power Electronics and Electrical Drives, University of Stuttgart, Germany)

This paper presents a novel control strategy, on the example of a three-phase voltage source inverter, to increase the lifetime of power semiconductor devices. Based on an online estimation of the junction temperatures the switching frequency is modified through the control to decrease thermal cycles. In addition the neutral point potential can be shifted using a flat-top method, resulting in an additional reduction of thermal cycles. So using the presented control system instead of an ordinary pulse width modulation the lifetime of power semiconductor devices is increased significantly.