Enterprise Europe Network

Square-wave multi-frequency power transfer

Country of origin:
Country: 
GERMANY
Opportunity:
External Id: 
TODE20171005001
Published
10/10/2017
Last update
24/10/2017
Expiration date
24/10/2018

Keywords

Partner keyword: 
Other energy related machinery
Other energy production
Transmission of electricity
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Summary

Summary: 
A German university active in the field of power electronics developed a new method to work with a mixture of several voltages and frequencies in order to achieve a selective energy supply for certain consumers on the secondary side of the grid. To open up the market for the square-wave multi-frequency power transfer for the use in intelligent local power grids the university offers its results to companies and institutes from the energy sector for a license or a research cooperation agreement

Description

Description: 

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.

Advantages & innovations

Cooperation plus value: 
The main advantages are: 1.) Increasing solid state transformer efficiency 2.) The possibility to locate the loads in different frequency systems. 3.) Each system has a special priority: During power shortage in medium voltage grid, only the prioritized harmonic systems continue to work at nominal voltage (e.g. hospitals and data centers). 4.) Instead the solid state transformer reduces the voltage in the low-priority systems by disconnecting the loads.

Stage of development

Cooperation stage dev stage: 
Under development/lab tested

Partner sought

Cooperation area: 
The university is looking for companies or institutes worldwide active in the field of electricity and energy supply or other electricity related activities to open up the market for this new method.They offer their scientific results worldwide for a license or a research cooperation agreement.