HANNOVER MESSE 2019, 01 - 05 April
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Transformers for the energy turnaround

Transformers has proved to be particularly adaptable

Logo Karlsruher Institut für Technologie


Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Transformers for the energy turnaround

Product description

The increasing share of renewable energies and the resulting more and more decentralised power supply are posing new challenges regarding the energy supply grids. Electricity from renewable energy sources is integrated into the low-voltage grid, and en route from the power station to the end consumer, it has to be converted several times regarding voltage and energy flow. Here, the use of solid-state transformers (SSTs for short) offers both a safe delimitation of the linked up grids through galvanic separation and a decoupling of frequencies from the input and output side. Unlike conventional transformers, SSTs are distinguished by greater flexibility and are therefore useful in the context of the energy turnaround. One possible variant of SSTs is built with modular multilevel converters (MMCs). These consist of a number of arms with at least two series-connected energy storage cells and marked inductivity. Scientists at the KIT Institute of Electrical Engineering (ETI) are developing new circuitry for such MMCs in order to ensure more stable power supply. The novel concept enables potential isolation with simple, flexible and scalable magnetic coupling of two or several MMCs. This allows energy of different voltage levels to be transferred between the converter and the power grid. Here, the arrangement also takes advantage of already existing inductivity, thus saving on magnetic material. This means that currently, the circuitry developed at KIT is the most compact and low-cost version of an SST based on MMCs. Additionally, the circuitry concept enables high voltage quality, which is of key significance above all in converter-based integration of renewable energy sources such as wind or solar energy. Thanks to the flexible intake and provision of idle power, SSTs can make an important contribution to ensuring voltage quality in intelligent, local distribution grids - so-called smart grids.

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Hall 27, Stand K51

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