Thank you so much you saved my day! :)
On Thu, Feb 20, 2014 at 7:42 PM, Petr Kaplunovich <[email protected]>wrote: > Thank you so much you saved my day :) > -- > Sent from mobile device. Sorry for any typos > > > On Thu, Feb 20, 2014 at 7:19 PM, Abhyankar, Shrirang G. < > [email protected]> wrote: > >> An isolated bus is a single bus that does not have any transmission lines >> connected to it and there are no shunt elements. MATPOWER treats isolated >> buses as out-of-service buses. In your case the two buses are not isolated, >> they form an island. So you would need to make one of the buses as the >> reference bus for that island. >> >> Shri >> >> From: Petr Kaplunovich <[email protected]> >> Reply-To: MATPOWER discussion forum <[email protected]> >> Date: Thu, 20 Feb 2014 15:40:50 -0500 >> To: MATPOWER discussion forum <[email protected]> >> Subject: Re: Case of islanding >> >> Thank you! Does two the case of two isolated busses ( busses that are >> connected to each other but not to the remainder of the grid) counts for >> isolated buses? Or only single buses do? >> >> >> On Thu, Feb 20, 2014 at 3:37 PM, Abhyankar, Shrirang G. < >> [email protected]> wrote: >> >>> I believe the power flow and OPF do work for islands provided you have >>> reference bus in each of the islands. One possibility for the solver >>> failure is the presence of isolated buses (buses that do not have any >>> transmission lines connected) in the islands. If there are any isolated >>> buses then you need to set its bus_type=4 in the bus data. >>> >>> BUS_AREA field is only used for petty printing purposes, it is not used >>> in the solution process. >>> >>> Shri >>> From: Petr Kaplunovich <[email protected]> >>> Reply-To: MATPOWER discussion forum <[email protected]> >>> Date: Thu, 20 Feb 2014 15:15:40 -0500 >>> To: "[email protected]" <[email protected]> >>> Subject: Case of islanding >>> >>> I have a network with islanding (graph is not connected) and trying to >>> run both DCOPF and DCPF on it. As I found in archives of this list, Prof. >>> *Zimmerman *replied once that if each island has a reference bus >>> (mpc.bus(i,2)=3) then both functions should work fine. However I keep on >>> getting matrix singularity matlab error for DCPF function and "solution is >>> primal infeasible" for DCOPF function. >>> >>> So the questions are - do DCOPF and DCPF MATPOWER solvers still work for >>> islanding cases? Any thoughts on why I may be getting this errors? Should I >>> set BUS_AREA field? >>> >>> Thank you! >>> Petr >>> >>> >> >
