Re: OPF: Objetive Function - Cost Model

[Abhyankar, Shrirang G.]

The appendix section 'Data File Format' in the manual details the format for 
generator cost data.

From: Angie Joaqui Rendon <nani0...@hotmail.com<mailto:nani0...@hotmail.com>>
Reply-To: MATPOWER discussion forum 
<matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Date: Fri, 28 Feb 2014 04:55:17 +0000
To: MATPOWER discussion forum 
<matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: RE: OPF: Objetive Function - Cost Model


The first four data of the "Generador cost data" (before the three values ​​of 
the cost coefficients). This is the information which appear in the description 
of the case of 9 nodes for OPF case:

%% generator cost data
% 1 startup shutdown n x1 y1 ... xn yn
% 2 startup shutdown n c(n-1) ... c0
mpc.gencost = [
2 1500 0 3 0.11 5 150;
2 2000 0 3 0.085 1.2 600;
2 3000 0 3 0.1225 1 335;

Thanks

________________________________
From: abhy...@mcs.anl.gov<mailto:abhy...@mcs.anl.gov>
To: matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>
Subject: Re: OPF: Objetive Function - Cost Model
Date: Fri, 28 Feb 2014 04:11:51 +0000

Which 'first four values' are you referring to?

From: Angie Joaqui Rendon <nani0...@hotmail.com<mailto:nani0...@hotmail.com>>
Reply-To: MATPOWER discussion forum 
<matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Date: Fri, 28 Feb 2014 03:59:24 +0000
To: MATPOWER discussion forum 
<matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: RE: OPF: Objetive Function - Cost Model

Thank you for your prompt response

By the form of these values i had the idea of that were these coefficients that 
you confirms to me. The first four values, do you know that they represent?

Again thank you very much, I hope not to importune.

Att: Angie Joaqui
Universidad del Valle
Cali - Colombia

________________________________
From: abhy...@mcs.anl.gov<mailto:abhy...@mcs.anl.gov>
To: matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>
Subject: Re: OPF: Objetive Function - Cost Model
Date: Thu, 27 Feb 2014 23:15:04 +0000


On Feb 27, 2014, at 4:40 PM, Angie Joaqui Rendon wrote:

Regards

I'm working with tho OPF in MATPOWER, and i wanted to know which is the model 
of costs that the program uses. I need the information to be able to compare 
results with other simulators, because of it I must have very well definite 
each datum of the information to using.

1. Looking at the information of the system of 9 Nodes; I find the following 
information of costs for the system:

%% generator cost data
% 1startupshutdownnx1y1...xnyn
% 2startupshutdownnc(n-1)...c0
mpc.gencost = [
21500030.115150;
22000030.0851.2600;
23000030.12251335;
];

What kind of cost model this information refers?

MATPOWER supports two types of cost functions: (a) Piecewise linear and (b) 
Polynomial. See the manual page on Generator cost data format to see how to 
specify the data for the two cost functions. For the above 9-bus case, the cost 
function is quadratic of the form c0 + c1*P + c2*P^2 where c0, c1, and c2 are 
the coefficients in the last, second last, and third last columns of gencost 
data.

2. In the page says that by default the objective function of the system is the 
minimization of costs, this objective function can be changed for others, e.g. 
minimize losses MVAR?

http://www.pserc.cornell.edu//matpower/#faq

Shri


I appreciate the information you can give me.