I'm not sure what you have in mind. If you are attempting to limit an OPF 
solution to constrain the ramp from a previous known dispatch, you can simply 
modify PMIN and PMAX to reflect the tighter of the original PMIN and PMAX and 
the corresponding ramp limited value.

-- 
Ray Zimmerman
Senior Research Associate
419A Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645




On Jan 28, 2013, at 8:24 AM, Carlos Gonzalez Almeida 
<[email protected]> wrote:

> Dear Dr. Zimmerman,
> 
> How can I implement ramp rate limit constraints in MATPOWER? could you please 
> help me?
> 
> Best Wishes
> 
> Carlos
> 

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