I presented at the international symposium (2/3).

――What did you present at the conference?
We summarized in a paper that our ventilation inverter panel has been converted to a 2-level inverter, and that there is no difference in noise or operational performance compared to using a 3-level inverter. The presentation is structured around this paper, titled “A strong advance in variable-speed control of road tunnel jet fans.”
――Why do you use a 2-level inverter?
Through verification, we found that a 2-level inverter can be used depending on the performance of the filter. While a 3-level inverter has a lower noise level compared to a 2-level inverter, it has the challenges of being limited in producers and being expensive.
――What else did you do besides the presentation?
At the exhibition booth, I exchanged business cards with jet fan manufacturers and consulting companies, explained our business activities, and discussed future market needs.
(Continued in 3/3!)


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