Re: benefit function of dispatchable load
Dear Samuel, I don't have any other problem. It is interesting when I change the benefit function coefficient to positive like this: mpc.gencost = [ . 2 0 0 3 0.5*0.015 13.00; ] there isn't any warning and DC Opf converge!!! now results is true???!!! hence the power associated with dispatchable Loads is negative but first part of cost function is positive(0.5*0.015*P^2>0)!! Is the final value of Opf correct??? With respect, Ali On 9/14/16, Samuel Perkinwrote: > Dear Muhammd, > > Your error message is not really an error, but is just a warning statement > that you shouldn't need to react to. It simply means that the optimisation > algorithm doesn't require an initial guess of the solution, and therefore > any initial guess is ignored. This warning message isn't related to > dispatchable loads. Did you get any other error messages? > > Your input for dispatachable load looks fine to me, except I think Qmax > (column 4) should probably be 0 to prevent your loads from acting as > 'reactive generators'. > > Kind regards, > > Samuel > > -Original Message- > From: bounce-120786253-76238...@list.cornell.edu > [mailto:bounce-120786253-76238...@list.cornell.edu] On Behalf Of Muhammd Ali > Mohseni > Sent: 14. september 2016 14:56 > To: matpower-l@cornell.edu > Subject: benefit function of dispatchable load > > Dear all > According to the Matpower manual (6.4.2 Dispatchable Loads) approach to > dispatchable loads is to model them as negative real power injections with > associated negative costs. but when I run dcopf I got this error!!! > > " MATPOWER Version 6.0b1, 01-Jun-2016 -- DC Optimal Power Flow The > interior-point-convex algorithm does not accept an initial point. > Ignoring X0." > > I set negative output, ranging from 0 to -1000 like this mpc.gen = [ . > 1 0 0 100 -1001.05100 1 0-1000 > 0 0 0 0 0 0 0 0 0 0 > 0; > ] > also I assume that bid function of load like this : aP+ b and benefit > function of load : 0.5aP^2+bP > > mpc.gencost = [ > . > 2 0 0 3 -0.5*0.015 13.00; > ] > >
RE: benefit function of dispatchable load
Dear Muhammd, Your error message is not really an error, but is just a warning statement that you shouldn't need to react to. It simply means that the optimisation algorithm doesn't require an initial guess of the solution, and therefore any initial guess is ignored. This warning message isn't related to dispatchable loads. Did you get any other error messages? Your input for dispatachable load looks fine to me, except I think Qmax (column 4) should probably be 0 to prevent your loads from acting as 'reactive generators'. Kind regards, Samuel -Original Message- From: bounce-120786253-76238...@list.cornell.edu [mailto:bounce-120786253-76238...@list.cornell.edu] On Behalf Of Muhammd Ali Mohseni Sent: 14. september 2016 14:56 To: matpower-l@cornell.edu Subject: benefit function of dispatchable load Dear all According to the Matpower manual (6.4.2 Dispatchable Loads) approach to dispatchable loads is to model them as negative real power injections with associated negative costs. but when I run dcopf I got this error!!! " MATPOWER Version 6.0b1, 01-Jun-2016 -- DC Optimal Power Flow The interior-point-convex algorithm does not accept an initial point. Ignoring X0." I set negative output, ranging from 0 to -1000 like this mpc.gen = [ . 1 0 0 100 -1001.05100 1 0-1000 0 0 0 0 0 0 0 0 0 0 0; ] also I assume that bid function of load like this : aP+ b and benefit function of load : 0.5aP^2+bP mpc.gencost = [ . 2 0 0 3 -0.5*0.015 13.00; ]
benefit function of dispatchable load
Dear all According to the Matpower manual (6.4.2 Dispatchable Loads) approach to dispatchable loads is to model them as negative real power injections with associated negative costs. but when I run dcopf I got this error!!! " MATPOWER Version 6.0b1, 01-Jun-2016 -- DC Optimal Power Flow The interior-point-convex algorithm does not accept an initial point. Ignoring X0." I set negative output, ranging from 0 to -1000 like this mpc.gen = [ . 1 0 0 100 -1001.05100 1 0-1000 0 0 0 0 0 0 0 0 0 0 0; ] also I assume that bid function of load like this : aP+ b and benefit function of load : 0.5aP^2+bP mpc.gencost = [ . 2 0 0 3 -0.5*0.015 13.00; ]