Skip to main content


An interdisciplinary R&D team develops a novel power-electronics-based transformer and analyses its application in the future electric grid.

Two low-voltage distribution grids in Rheinfelden AG (red and blue). The columns indicate the photovoltaic peak power which can be installed, if a solid-state transformer is used.


Solid-state transformer, power electronics, silicon carbide SiC, semiconductors, energy change


Technology development for novel silicon carbide (SiC) based solid-state transformer (SST) and analysis of its application in the Swiss electric grid.


In future, a large amount of electric energy will be produced by fluctuating resources such as wind and photovoltaic power plants. This imposes challenges on regional distribution grids regarding voltage stability and the load on grid components.

In contrast to conventional copper and iron-based transformers, novel power-electronics-based transformers are able to adjust dynamically electric parameters like voltage and reactive power. This way, they can stabilize local grids also under challenging conditions.


The power semiconductor switches of the solid-state transformer are made of the novel semiconductor material silicon carbide (SiC). In comparison to well-established silicon semiconductors, SiC enables more compact and energy-efficient power electronic systems.

The Paul Scherrer Institute (PSI) and the École polytechnique fédérale de Lausanne (EPFL) provide technologies for fabrication and thermal management of SiC devices. At ETH Zurich, hardware and modulation concepts are developed and a SiC SST demonstrator is built.

The Institute for Electric Power Systems at FHNW coordinates the entire project and investigates innovative applications of new transformer technologies in the context of the Swiss Energy Strategy 2050 by carrying out in-depth simulations of a real distribution grid containing more than 100 transformers.

Two industry advisors, ABB Corporate Research and BKW Energie AG, support the project consortium by providing application-relevant information and by reviewing the project results.

Project information


Nationales Forschungsprogramm "Energiewende"


FHNW Institute of Electric Power Systems


ABB-Forschungszentrum, École polytechnique fédérale de Lausanne (EPFL), Paul Scherrer Institut (PSI), ETH Zürich


4 years


Schweizerischer Nationalfonds SNF

Project leader

Prof. Dr. Nicola Schulz