Centralized Short-Circuit Detection for Multiphase Inverters

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 7Sprache: EnglischTyp: PDF

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Huber, Thomas; Kleimaier, Alexander (University of Applied Sciences Landshut, Germany)
Kennel, Ralph (Institute for Electrical Drive Systems and Power Electronics, Technical University of Munich, Germany)

This paper presents a novel short-circuit (SC) detection method. Only one centralized measurement circuit is necessary per device / inverter, with significant advantages in combination with multiphase systems. It decouples the inverse AC component of the DC-link voltage to gather information about the output current. First tests achieved a SC detection time of 5.8 mus, which is already well suitable for fast detection of a load SC. To improve the SC detection time allowing for the protection from a module-internal SC, the SC detection topology was complemented. The functionality was validated by implementation in a three-phase silicon carbide (SiC) inverter resulting in a fast SC detection and turn-off within 260 ns after SC event.