Three-phase power representations: abc frame, αβ frame and dq frame 

An introduction on the Clarke and Park transformations; static and rotating frames of reference; motor and grid-tie control of voltage-sourced converters.
NOTICE: the video doesn't contain audio from 11:49 beyond indeed (that's not an upload error). I added the figures for the control part only after I recorded. Thus, no audio indeed, just the figures.