I do design and produce MW inverters and converters with single levels topology.
The added complexity of a multilevel design is only justifiable when the semiconductors are not available. More switches, isolated supplies, and gate drivers increase the chances of failure. Those switches and their gate drivers need a higher isolation rating than what is normally designed in. EG: A 1200V IGBT has about 2500V of insulation to the heatsink. If you place two or three levels of those, you will get arcing within the IGBT module.
Things might look good in your lab simulation but it is not yet a viable industrial solution. It might be one day, but it is more likely that semiconductors with higher voltage rating and insulation will be developed. In general, an idea starts complicated and becomes useful once it has been simplified to the point where everybody says "why didn't I think about this myself". Then it is a good idea.
Nevertheless there might be a few special applications where multi-level inverters will be used in the next few years.
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Multi Level Inverter
Re: Multi Level Inverter
