The working group of the faculty of engineering of the university proceeded on the assumption that the solid state transformer has a lower efficiency with respect to the traditional transformer due to the high switching frequency losses and the presence of passive elements like the low voltage side AC filter. In principle the voltages and frequencies can be freely selected in the conventional low voltage grids supplied via solid-state transformers (STT). At present only one voltage and one frequency is always used. The higher harmonics arising through switching operations are suppressed with a filter as an interfering frequency. The proposed methodology eliminates the low voltage side filter and reduces drastically the switching losses, imposing a square-wave voltage waveform. This waveform contains all harmonic content and each load, supposed connected to the grid with a power electronics interface, absorb the current at the desired frequency. The university is looking for companies or institutes worldwide active in the field of electricity and energy supply or other energy related activities to establish a license or a research cooperation agreement.