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Anonymous Poster

Multiple Generators and Unequal Loads

09/08/2009 3:37 AM

we have a three generators ratings are 6.5MW,6.5MW . all are in synchronism. all generator outgoing are coming as a incomer in our substation.and incomers bus coupler is in on condition . and my question is my incomer saws a different load amp. HOW.why it is not share equal load.
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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#1

Re: Multiple Generators and Unequal Loads

09/08/2009 9:44 PM

Not sure, I understood your question correctly.

Not necessarily all identical generators run in parallel should equally share the load. The load sharing depends on the factors like (1) governor settings (2) manual intervention of the load sharing (3) any other load sharing mechanism.

-MS

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hara143
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Join Date: Mar 2007
Location: India Bangalore
Posts: 40
#2

Re: Multiple Generators and Unequal Loads

09/09/2009 11:02 PM

Load sharing depends on droop settings. Voltage( AVR) & Speed( Governer). Voltage droop is adjusted to have eaqual KVAR load sharing and Speed droop is adjusted to KW load Sharing.

But this is done during installation and it is one time effort. We may have to check the settings first. In your case since all are of same capacity the droop seetings should be same.

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ramvinod
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Join Date: Jun 2007
Location: chennai,India
Posts: 592
Good Answers: 19
#3
In reply to #2

Re: Multiple Generators and Unequal Loads

09/10/2009 11:54 PM

If this problem cropped up recently, check the controllers and the AVR.

If this is there from the day of installation and commissioning controllers and AVR to be tuned properly.

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 Ramesh,Freelance Electrical/automation Consultant
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