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Join Date: Nov 2016
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Power Generation

03/19/2017 2:47 AM

Dear all

good day

generator 250MVA,200MW,PF 0.8 lag,if the power factor become unity

can we increase the active power above 200MW

thanks

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#1

Re: generation

03/19/2017 8:47 AM

Yes. You can acquire a second generator. Make sure it can be synchronized.

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#2

Re: generation

03/19/2017 3:01 PM

if the power factor become unity

How?

can we increase the active power above 200MW

Why?

250MVA, this really looks like a homework question.

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#3

Re: Power Generation

03/19/2017 6:10 PM

Valid question, newbies and pros(?) often confuse the alternator rating (250MVA@0.8pf), with the prime mover operating point (250MW).

The answer is it depends the rating of the prime mover and its ability to produce 250MW continuously; the alternator doesn't care as long as the operating point is within the GCC (Generator Capability Curve) and stability/voltage limits set by the system operator.

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#4
In reply to #3

Re: Power Generation

03/20/2017 5:48 AM

GA from me too. I initially thought the answer was No but you convinced me!

But not sure why you say in 1st sentence "....prime mover operating point (250MW)" As you say later, we don't know the prime mover power, except that it's not < 200MW.

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#5
In reply to #4

Re: Power Generation

03/20/2017 8:51 AM

That was a direct response to his query about loading the machine to a particular MW output. The shorter answer would be, "Assuming a fixed frequency, within its mechanical, electrical, and connected system limits, you can load your machine to any combination of MW, MVAR, and PF; but you can only choose any two out of the three."

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#6
In reply to #5

Re: Power Generation

03/20/2017 2:54 PM

Very well done, sir!

I totally agree, not only that, but also MW(th)›MW(e) every time, every day of the week, maybe twice on Sunday!

Usually, three sides of a triangle only allow so much degree of freedom, and the rest is smoke (release).

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