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buckman

buckman

Electrical
Jun 8, 2005
7
Superconducting Magnetic Energy Storage Systems

Is anyone familiar with the uses of this technology? I am looking for an application that can maintain a constant power draw on the load side to reduce the effects of load swing that a utility will see when trying to ramp generating units to follow the load (300+ MW load swings). The load has the capability to ramp up or down at less than 5 MW/s, and can do this multiple times in a short period. However, this typically occurs only two to three times pre hour during normal operations.

One thought has been to use a large resistor on the load side to maintain a constant power draw and then find a use for the heat that is dissipated. This seems like a large waste of energy, if an efficient use cannot be found for the heat transferred.

A secondary goal is to better enable the load side to ride through line side voltage depressions and instantaneous interruptions. Thanks
 
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buckman
Are you saying that the governors of the utility generators supplying your facility are are to slow to respond to the load changes that you are making. 300MW load swings are pretty big, are you a major power user on a relatively weak power system? Maybe the utility needs to look at fitting power system sabilisers into the Automatic Voltage Regulators on their generators.

If you are the cause of such large power swings and these effect your voltage, maybe you should look into a static VAr commpensation system as well.

 
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itsmoked thanks for the link looks to me like this is some type of UPS am I mistaken?

niallnz, sorry for being intentionally vague with my request. I am the utility, and this customers load does cause us problems with load following. They do have a static var compensator.

We have several reasons for wanting to levelaize their power draw, one is that we are forced to put multiple units on load control to follow their load, which is troublesome when you want to econmically dispatch your units, plus there is additional wear and tear on the units by ramping them. Another issue is government regulations that require us to match our generation to the demand, to avoid pulling genration form off our system to support our load.

We work closely with this customer and try to come up with solutions that are mutually beneficial to the problems that we have. The customer actually has suggested the large resistor idea, and I was trying to research some alternatives. Bleeding off power through a resistor during a ramp down in load to maintain a constant power draw just seems like a waste of energy to me, especially when you consider the recent spike in the price of our natural resources.

This is only second post, do you know how or if you can attach files to a post. I'd love for you to take a look at their load profile.
 
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Hi buckman,

I believe it might be. I read a long document on the Alaska thing about 2 years ago. But could not find it with a brief look. That was the only thing I came across that hinted about it.

As for showing pictures in a post, this is a common question so I wrote a FAQ on it. The FAQ takes a while to go active so I will include it here rather then just a link to the FAQ.


------------------ Future FAQ ---------------------

Pictures as they say can be worth a 1000 words. They also make posts more interesting.

The process takes about about 20 seconds once you understand it. It's much simpler than this FAQ looks!

To post a picture.

1) Whatever you want to post get it into *.jpg form.

2) Don't make it too big, 640 by 500 is pushing the limits. This makes the post slower to load and can distort the page. Better is about 450 by 400.

3) Place the picture on a "no password" picture hosting server. There are many different ones. Some are a problem. Some require passwords. Some try to stick ads in, etc. Avoid those. One of the easiest I have found with no obvious defects is called:
Goto and click "browse". Hunt down the picture you want to post on your system. The path to the picture you have chosen will then show up in the "upload" window.

4) Click the "Host Picture" button.

5) Your picture will appear at the bottom along with four ways to get to it on the web.

6) Highlight and copy the TOP link in the list.

7) Now back here in eng-tips, in the POST you want the picture to show up in, just enter the link you just saved in the following form:

{img justsavedlink}

NOTE: USE SQUARE BRACKETS INSTEAD OF CURLY BRACKETS!!

"{ -> [" and "} -> ]"

This example has to use curly brackets or the example would be processed instead of being shown in print.


8) Now to prevent making a fool of yourself, press the "Preview Post" button to make sure the post will come out the way you want it to. If you are happy with your results proceed to posting your submission.

--------------------- END FAQ -----------------------
 
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