#1
Posted 12 October 2011  07:07 PM
I haven't come across this term in any of my review books. Can anyone explain it? Have I missed a major topic in my review work and now need to panic? Thanks for any help.
I found a humorous description here but it didn't help a ton.
#3
Posted 12 October 2011  07:53 PM
Thanks, I had found that. I was hoping for a more commonsensical explanation, especially as it pertains to the PE.
#4
Posted 12 October 2011  08:49 PM
All this applies to the specific software I use, so it may not apply in general or make sense to everyone.
#5
Posted 12 October 2011  09:04 PM
I think the restaurant explanation is a pretty good one. Modern day power flow studies are vast multivariable systems solved by computer in a series of iterations that invariably leaves some remainder at the end that can only be solved with one more iteration. This is true at any given point in time. The slack bus operates as just that  it takes up the "slack"  so the model will solve, or at least solve a little faster once it gets close enough.
It's sort of like the plot to Matrix II if you think about it.
#6
Posted 12 October 2011  09:47 PM
One thing I might add, correct me if I'm wrong. . . the iterations of a power flow solution continue until the swing bus P & Q values fall below a set point, right? To minimize the error.
#7
Posted 12 October 2011  11:29 PM
#8
Posted 12 October 2011  11:39 PM
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Hell, I can barely handle English.
#9
Posted 13 October 2011  02:20 PM
That's correct. If you run enough iterations, the error approaches zero, but that level of accuracy is time consuming and unproductive when you can just let the slack bus take it up when it gets close enough to whatever set point you determine.One thing I might add, correct me if I'm wrong. . . the iterations of a power flow solution continue until the swing bus P & Q values fall below a set point, right? To minimize the error.
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#10
Posted 13 October 2011  03:11 PM
As I have never performed a power flow study for work, are there other essentials that I should be familiar with for the test?
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