See responses below … -- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645
On Jan 20, 2014, at 8:57 AM, Petr Kaplunovich <[email protected]> wrote: > 1. That’s the thing - i haven’t run into the cases where constraints are > violated ( during my 0.5 year experience with MATPOWER), however constraints > described in the user guid (section 5.2) does not include line’s power > limits. I just wanted to confirm that. > The RATE_A column of the branch matrix is used to set the active power flow limit on a branch for the DC OPF. Equations (5.17) and (5.18) are the flow limit constraints. You can also directly said angle difference limits if you like, as Shri alluded to, though that isn’t necessary if all you need is power flow limits. > 2. I also just run into ‘OF_FLOW_LIM’ option. It’s default value in the > manual is specified to be 0. So is there any difference between > > > > mpopt = mpoption('OUT_ALL',0,'VERBOSE',0);%,'OPF_FLOW_LIM',1); > > [mpc_solved, success] = rundcopf(mpc,mpopt); > > > > and > > > > mpopt = mpoption('OUT_ALL',0,'VERBOSE',0,'OPF_FLOW_LIM',1); > > [mpc_solved, success] = rundcopf(mpc,mpopt); > There is no difference for DC OPF problems. That option only applies to the AC OPF. > On Mon, Jan 20, 2014 at 8:26 AM, Abhyankar, Shrirang G. <[email protected]> > wrote: > See below. > > From: Petr Kaplunovich <[email protected]> > Reply-To: MATPOWER discussion forum <[email protected]> > Date: Mon, 20 Jan 2014 07:21:40 -0500 > To: <[email protected]> > Subject: DCOPF taking into consideration line power limits.(and N-1 criteria) > > Dear All, > > I was doing contingency screening research for a last half year using > MATPOWER and only now decided to read the documentation to MATPOWER entirely. > I was thinking that DCOPF takes into consideration line power flow limits > (basically the difference between node angles). However it appears to me that > these constraints are not considered. > > 1. Am I right? > > I don't think so. Perhaps you are not setting up correctly causing angle > limits to be ignored? Please send a small reproducible example that we can > take a look at. > > 2. Is there any easy way to include these constraints to DCOPF solver? I have > read the section 6.1 but still confused - is there any examples of > implementation? > > 3. Is there a way to make DCOPF solver to take into consideration N-1 > security criteria? (i am currently interested only in line outages) > > You'll need to extend MatPower's DCOPF by introducing additional constraints, > variables for the contingency cases. See the manual section on 'Extending the > OPF'. > > Shri > > Thank you! > Petya >
