Google "HVDC in the pacific northwest" will get you a couple of links. There are two links (npi) from near The Dalles dam on the Columbia to S CA.
Also there is a site that lays out DC interties as firewalls between major grids therefore minimizing intergrid interferences leading to instability. I expected to find something on the line that runs across WA and crosses Hyw 18 near Covington (major substation) but have come up blank. The geometry is that of a HVDC line ... three conductors in a triangle maybe a foot or so on a side. Nice pictures in a pdf on HVDC in Alberta. Dave On Tue, 2010-11-23 at 11:52 -0500, 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.. ;-) > > I remember finding it via a google lookup one time. > > Dave > > On 11/23/2010 11:25 AM, dave wrote: > > 50 some years ago a couple of engineers came to Coulee from the Denver > > office (USBR) and installed a mag amp in feed forward mode to control > > the penstock gate on one of the small units. This was before the third > > powerhouse so the units were all 108 Mw. This one unit was used to swing > > the entire Northwest Power Pool ( OR, WA, ID, UT, and most of MT and > > WY ). I don't have any quantitative figures but the frequency regulation > > got 10X better. > > > > Dave > > > > On Tue, 2010-11-23 at 17:17 +0200, Roland Jollivet wrote: > > > >> I heard once (here in SA) that the mains cycles were adjusted close to > >> midnight, so that the number remained consistent on a daily basis. I don't > >> know how it's arranged though, since there are so many power stations to > >> sync. > >> > >> Regards > >> Roland > >> > >> > >> > >> > >> On 23 November 2010 16:49, Ian W. Wright<watchma...@talktalk.net> wrote: > >> > >> > >>> On 23/11/2010 14:37, Andy Pugh wrote: > >>> > >>>> On 23 November 2010 14:31, Ian W. Wright<watchma...@talktalk.net> > >>>> > >>> wrote: > >>> > >>>> > >>>>> hell, I've seen our mains frequency > >>>>> vary from 47 to 54 Hz over the day many times depending on > >>>>> the load and no one ever complains....... > >>>>> > >>>> Though supposedly you should still always get 4320000 cycles per day. > >>>> > >>>> > >>> Yes, you're right but I'm not sure how close they ahere to > >>> that nowadays. With the common frequency dips due to load > >>> problems and the tendency for people to convert to quartz > >>> timing instead of mains synchronous, I wonder if they bother > >>> so much or whether they just try to get it right weekly or > >>> some such. Maybe I'll put a mains frequency monitor on here > >>> out of interest - its 13 years since I retired from the > >>> ratrace of chasing power around plant rooms...... > >>> > >>> Ian > >>> > >>> > >>> ------------------------------------------------------------------------------ > >>> 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. 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