How to select the right topology for your project?

The full IGBT AFE is suitable for Electrolysers working on a relative high DC voltage ranging from 800 to 1500VDC. It can be applied in an environment with strict power quality requirements. An additional benefit is the synchronization with the electrical grid and full behavior control, allowing reactive and capacitive power supply.

The IGBT AFE with Chopper is suitable for Electrolysers working on a relative low DC voltage ranging from 600 to 1200VDC. The power quality requirements can be equal to the full IGBT AFE. This topology has controlled grid coupling, allowing reactive and capacitive power supply.

The Diode IGBT chopper uses a diode bridge to create a fixed DC which thereafter is controlled by the chopper to the required DC level. This topology can be used with electrolysers working on a DC voltage ranging from 500 to 1200 VDC. The power quality characteristics are suitable for most grids.

The converters set up with the thyristor semiconductor are suitable for grids with low demand on power factor and harmonics and/or electrolysers that require large currents. However, additional compensation equipment is required, which compensates for the reduced cost of the system.

Technology not applied on large scale yet. First large-scale pilots are being set up. This development is targeting conversion with high efficiency,  perfect power factor and no harmonics, against minimum cost.