I've done it quite a few times for various projects.
Originally Posted by steve66
One of the more interesting was for testing energy storage flywheels. The problem is what to do with all the stored energy.
A few numbers. The source was three phase mains transformed up to about 1200V with a Delta-delta wye (Ddyn11) transformer, rectified and smoothed to get an ultra low ripple 1500V, 600A supply (900kW).
That powered up a whole bunch of flywheel motors. Initially, the stored power was just dumped in a load bank. Expensive waste of energy.
The next phase of the project was to recover that energy - recyle it if you like. We built a step down chopper to get from 1500Vdc to 400Vdc and followed it with a mains commutated inverter to stick the energy back into the 400Vac utility supply.
Interesting as I said, all topology we already employed, but the scale made a little more of a challenge.
Si hoc legere scis nimium eruditionis habes.