S
Can anyone explain the feature, the Power System Stabiliser (PSS) in generator excitation systems/Automatic Voltage Controller? How does it work?
shanks,
The best way to explain a PSS is to say there is a function with some inputs and some outputs, and inside the function some FBM occurs (FBM is Friggin' Black Magic).<pre>
------------
| |
Inputs---->| FBM |---->Outputs
| |
------------</pre>The inputs are generally speed and/or frequency, generator terminal voltage, generator excitation (voltage and/or current). The outputs are signal(s) that increase/decrease generator excitation in order to prevent low frequency oscillations from affecting unit operation and/or to help stabilize the grid with which the unit is synchronized by helping to dampen oscillations which can lead to very serious grid problems.
You can use your preferred Internet search engine and look up the term:<pre> "power system stabilizer"</pre>or<pre> "power system stabilizer definition"</pre>(with the double quotation marks in both cases) to find more, possibly better, links. Here's one that, if you read through the entire slide show actually provides some pretty good information:
http://www.slideshare.net/sumansourabh1/power-system-stabilizer
Sometimes, third-party manufacturers of Power System Stabilizers have technical papers (sometimes referred to as "white papers") on them; you just have to go to the websites of these manufacturers (Basler Electric; possibly Woodward Governor) and search their technical resource sections to find them. Many times they ask for an email address and some contact information; most don't contact you, but some do with sales questions. You can just politely decline, saying you are just doing research. They may have more information they could provide, too. Just ask.
Really, it's a pretty sophisticated way of detecting small issues which can become big issues and cause instability for either the generator or the utility. It's almost impossible to tell when they're working (some have LEDs to say they are active), but it takes an oscilloscope to really see what's going on. Some have data recording and capture capabilities which can be used to analyze information in the event of problems or questions.
There are really very few people in the world who really understand--and can explain it to other people so they can also understand--Power System Stabilizers. Most know it's very important for some grid protections and stabilization, and that it's required for some grid connections and sections.
If you find some really descriptive and useful information in your quest, it would be great if you could post the link(s) here so that others can also look and read and learn. Thanks!
The best way to explain a PSS is to say there is a function with some inputs and some outputs, and inside the function some FBM occurs (FBM is Friggin' Black Magic).<pre>
------------
| |
Inputs---->| FBM |---->Outputs
| |
------------</pre>The inputs are generally speed and/or frequency, generator terminal voltage, generator excitation (voltage and/or current). The outputs are signal(s) that increase/decrease generator excitation in order to prevent low frequency oscillations from affecting unit operation and/or to help stabilize the grid with which the unit is synchronized by helping to dampen oscillations which can lead to very serious grid problems.
You can use your preferred Internet search engine and look up the term:<pre> "power system stabilizer"</pre>or<pre> "power system stabilizer definition"</pre>(with the double quotation marks in both cases) to find more, possibly better, links. Here's one that, if you read through the entire slide show actually provides some pretty good information:
http://www.slideshare.net/sumansourabh1/power-system-stabilizer
Sometimes, third-party manufacturers of Power System Stabilizers have technical papers (sometimes referred to as "white papers") on them; you just have to go to the websites of these manufacturers (Basler Electric; possibly Woodward Governor) and search their technical resource sections to find them. Many times they ask for an email address and some contact information; most don't contact you, but some do with sales questions. You can just politely decline, saying you are just doing research. They may have more information they could provide, too. Just ask.
Really, it's a pretty sophisticated way of detecting small issues which can become big issues and cause instability for either the generator or the utility. It's almost impossible to tell when they're working (some have LEDs to say they are active), but it takes an oscilloscope to really see what's going on. Some have data recording and capture capabilities which can be used to analyze information in the event of problems or questions.
There are really very few people in the world who really understand--and can explain it to other people so they can also understand--Power System Stabilizers. Most know it's very important for some grid protections and stabilization, and that it's required for some grid connections and sections.
If you find some really descriptive and useful information in your quest, it would be great if you could post the link(s) here so that others can also look and read and learn. Thanks!
S
shanks
Thanks for the information CSA.
In fact,one of the guidelines of Electricity Authorities for Power Plant installation & operation is to have Power System Stabilizer (PSS) feature in Excitation control systems for the generators of 100MVA and above. As suggested by you I'll get back as and when I get more information on PSS.
Thanks.
In fact,one of the guidelines of Electricity Authorities for Power Plant installation & operation is to have Power System Stabilizer (PSS) feature in Excitation control systems for the generators of 100MVA and above. As suggested by you I'll get back as and when I get more information on PSS.
Thanks.
