|
|
| Author |
Message |
bruce varley
science forum beginner
Joined: 31 May 2005
Posts: 38
|
 Posted: Thu Apr 06, 2006 1:55 pm Post subject:
Industrial generation dynamic behaviour
|
|
|
Hello, This isn't strictly a control question, but it relates to a current
control problem. We're modelling parts of a plant power generating system
and need an indication of approximate process dynamics. Following may not be
in correct terminology.
Can anyone give me an indication of the natural frequency for a pair of
steam turbine driven alternators, about 15MVA each, parallelled on a bus?
That is, the frequency of torsional oscillation and power slew following a
step disturbance. TIA |
|
| Back to top |
|
 |
Tim Wescott
science forum Guru Wannabe
Joined: 03 May 2005
Posts: 292
|
| Posted: Fri Apr 07, 2006 5:16 am Post subject:
Re: Industrial generation dynamic behaviour
|
|
|
bruce varley wrote:
| Quote: | Hello, This isn't strictly a control question, but it relates to a current
control problem. We're modelling parts of a plant power generating system
and need an indication of approximate process dynamics. Following may not be
in correct terminology.
Can anyone give me an indication of the natural frequency for a pair of
steam turbine driven alternators, about 15MVA each, parallelled on a bus?
That is, the frequency of torsional oscillation and power slew following a
step disturbance. TIA
I don't do big power stuff, so I'll also use terminology that may not be |
correct: This would depend quite heavily on the generators' moments of
inertia, but more importantly on their torque 'constants'. This torque
vs. position relationship would be the apparent spring constant in a
spring-mass system, and would in turn be proportional to the field
current. Since the field current would depend on whatever the current
demands were from the generating plant, I would expect a wide range of
resonant frequencies.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Posting from Google? See http://cfaj.freeshell.org/google/ |
|
| Back to top |
|
|
Kelvin Hales
science forum beginner
Joined: 03 May 2005
Posts: 45
|
| Posted: Fri Apr 07, 2006 11:23 am Post subject:
Re: Industrial generation dynamic behaviour
|
|
|
In article <4435264b@quokka.wn.com.au>, Bruce varley wrote:
| Quote: | Hello, This isn't strictly a control question, but it relates to a current
control problem. We're modelling parts of a plant power generating system
and need an indication of approximate process dynamics. Following may not be
in correct terminology.
Can anyone give me an indication of the natural frequency for a pair of
steam turbine driven alternators, about 15MVA each, parallelled on a bus?
That is, the frequency of torsional oscillation and power slew following a
step disturbance. TIA
|
Bruce,
Are you talking about a step-change in electrical load, or a step-change in steam supply to
the turbines?
Kelvin B. Hales
Kelvin Hales Associates Limited
Consulting Process Control Engineers
Web: www.khace.com |
|
| Back to top |
|
|
Google
|
|
| Back to top |
|
|
|
|
The time now is Wed Jan 07, 2009 8:03 pm | All times are GMT
|
|
Payday Loans | Bad Credit Credit Cards | Bankruptcy | Mortgage Calculator | Mobile Phones
|
|
Copyright © 2004-2005 DeniX Solutions SRL
|
|
Other DeniX Solutions sites:
Electronics forum |
Medicine forum |
Unix/Linux blog |
Unix/Linux documentation |
Unix/Linux forums
|
Powered by phpBB © 2001, 2005 phpBB Group
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
Forum index
»
Science and Technology
»
Engineering
»
Control
