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The 100 MVA intertie is mainly characterised by the following innovations: − hard driven GTO (HD-GTO) with a new housing − series connection of hard driven GTOs − low-inductive high power HD-GTO inverter valve − fuseless high power HD-GTO inverter. The presented hard driven GTO technology allows the robust, reliable and cost-efficient series connection of GTOs. The concept of the 100 MVA intertie, which is based on the HD-GTO technology, is reviewed. The development of the high power HD-GTO inverter module according to a state-of-the-art development process is presented. With the use of a circuit simulator with accurate physical models of the power semiconductors, especially the concept phase, the development phase and the verification phase have been supported.

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