[time-nuts] Line Frequeny Stablity
scott.j.stobbe at gmail.com
Wed Apr 5 13:06:26 EDT 2017
I would guess the tightest control loop is on the generator stator field
windings, with mechanical control being secondary. Definitely a lot of
poles and zeros to worry about.
On Wed, Apr 5, 2017 at 9:01 AM, jimlux <jimlux at earthlink.net> wrote:
> On 4/4/17 2:28 PM, Thomas D. Erb wrote:
>> Thanks for the info.
>> So that tells me how data is recorded - but not how the frequency is kept
>> stable ?
>> Is the line frequency now directly tied to GPS clock - with no drift ?
> The line frequency is adjusted, for the most part, by adjusting the prime
> power (steam valves, dam penstocks, etc.) on the generators at power
> stations. That changes the speed, slightly, although as generator 1 of N
> starts to get ahead, the electrical load increases, and it slows down.
> It's actually a pretty complex system, since there are a whole raft of
> "spring constants" in between the multiple generators in a system, there's
> phase shifts due to transmission line inductance and capacitance.
> "Stabilizing" a system in the face of changing demand is a non-trivial
>> Thomas D. Erb
>> tde at electrictime.com<mailto:tde at electrictime.com> /
>> Electric Time Company, Inc.
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