Abstract
This paper presents a Hybrid Circuit Breaker for Medium Voltage Direct Current grids, consisting of an ultra-fast mechanical breaker and a parallel Diode-Assisted Gate-Commutated Thyristor. This device is a GCT based devices, especially developed for this application. It has a higher current interruption capability than commercial IGCTs and a more robust, power-efficient and faster gate drive unit. We designed a stray inductance optimized package with an integrated gate drive unit for the Diode-Assisted Gate-Commutated Thyristor and included diodes with a very high forward voltage drop, which were radiated especially for use in a Diode-Assisted Gate-Commutated Thyristor, to increase its current turn-off capability. The build prototype can interrupt fault currents of 10 kA. An analysis of the stray elements in the package showed a possible increase of the current interruption capability to xy. We analysed the boundary conditions for potential use in an Hybrid Circuit Breaker by investigating the turn-on and turn-off characteristics of the device embedded in a diode full bridge and including a snubber capacitor.
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