Dave wrote: > Interesting. > > Apparently there is a large DC inverter station out in the northwest?? > that is used to allow different synchronization of the grids in the > eastern US with the western US or across some other regional divide. > > Sort of like a giant AC drive taken to an entirely different level.. ;-) > > My understanding is that most of the time the Eastern and Western grids are not tied, but that during shortages, they can interconnect that way. Many years ago, maybe in the 1960's or so, they tried a direct AC interconnect across the Hoover Dam, which bridges the two grids. The system became unstable, as they had two big pools with a HUGE length of transmission lines between them, thus a large inductor between what acted somewhat like two big capacitors. They developed a large amount of reactive power flowing back and forth between the two systems at a rate of a couple Hz, or maybe it was below one Hz.
Anyway, they later installed a huge cycloconverter that could couple the two systems without regard to phase angle, and send power whichever way it was needed. Jon ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
