APPS: MW (Load) Swing

Mon Jul 20 07:10:26 EDT 2009

==> Automation List post by Dooley, Vince...
To view or reply to this thread: http://www.control.com/thread/1247989087#1248065322

------------------------------------------------------------------------------------
Re: APPS: MW (Load) Swing
------------------------------------------------------------------------------------
This may or may not be relevant but when dealing with dynamic stability issues it can be useful to consider the following equation:

Electrical Power = ((Eo.Vt)/Xs)Sin(delta)

Eo is excitation
Vt is terminal voltage
Xs is synchronous reactance
Delta is the angle between the machines magnetic field and the systems
magnetic field.

If the electrical power out does not equal the mechanical power in then the power imbalance accelerates or decelerates the rotor.

For example, if a fault on a power network occurs and reduces the terminal voltage then the electrical power output will immediately decrease. The excess mechanical power will accelerate the machine and in response to the increase in speed the governor will start to reduce mechanical power.

Also, Governors and AVR's are automatic control systems. They have to be tuned properly.

Vince
------------------------------------------------------------------------------------

==> A Note from the Sender of this Message...
You are receiving this message because a subscription was entered for your address
for the Control.com Automation List.  To unsubscribe, send an email to us at 
forum at control.com requesting your removal from the subscription list.

This email was sent by: 
Control.com, Nerds in Control, LLC,
116 Brigham Hill Rd., N. Grafton, MA 01536, USA.