At 01:02 AM 11/20/00 +0200, Peter L. Peres wrote: > >connect generator when in phase > >Bob, thank you for the explanation, but I think that there are some very >serious issues with this. Notice that I asked about very large networks >(with significant time delays). What I see is, that one connects the >generator and then starts putting on power (by pushing the phase a bit >forward). Now, the other generators on the grid will have this as decrease >in load, but after a time delay (caused by the network). They will >regulate down, but the new generator will see this only after the network >delay etc etc. You have generators with gain (in the control loops) and a >long time delay = oscillator. I have seen this happen when large grids >were coupled to each other. We were consumers and we had the voltage go >between 170 and 240V in a nice sinus for several seconds at a time when >they did this ;-) I suspect that in a very large net you DON'T have this >effect. The question was, how come you don't. Power system stabilizers. Fixed purpose control systems that can over-ride the generator's voltage regulator. I don't know much about them (others hear at Trinity know very much about the subject) but I know that they are quite effective. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 16 years of Engineering Innovation (1984 - 2000) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics