Dear Shri Thanks for your answer. But I don't want to use runopf(). I want to write these constraint manually with Ybus and equations I've written. Is that possible? How should I start?
Thank you. On Fri, Apr 10, 2015 at 1:24 AM, Abhyankar, Shrirang G. <abhy...@mcs.anl.gov > wrote: > I don't know what your algorithm does but I think you can do the same, > determine optimal generation and load, using MATPOWER's optimal power flow > (runopf). runopf supports all the constraints that you've listed. > > > > Shri > > ------------------------------ > > *From:* bounce-119032919-33970...@list.cornell.edu [ > bounce-119032919-33970...@list.cornell.edu] on behalf of Electric [ > electricaltranslat...@gmail.com] > *Sent:* Thursday, April 09, 2015 3:18 PM > *To:* MATPOWER discussion forum > *Subject:* How to verify the feasibility of your solution without running > Power flow? > > I am using an algorithm that changes the amount of demand and > generation at each bus (Pd,Pg) to mitigate over load of lines and enhance > the security. The output of my algorithm (Pd,Pg) must be checked to insure > that they are feasible. So, it is obvious that by assigning this new > calculated values instead of old Pg and Pd (generation and demand ) at each > bus and running a simple power flow (pf), I can find out if the calculated > results are feasible. > However, this is an optimization problem. Therefore, feasibility of > the suggested values of Pd and Pg by fmincon must be verified at each > iteration(1000 times). Basically, it can be accomplished by running a power > flow in constraint function of fmincon and checking lines loading and > voltage range. > But, doing so is very time consuming and takes more than an hours to > calculate the feasible Pg and Pd. So I was wonder if there is another > faster way to check the feasibility of the calculated Pd,Pg without running > power flow. > I think, if the solution (calculated Pd,Pg) satisfies these > constraints,the answer is then feasible and there is no need to run power > flow. > But I have some problems in considering the constraints 5,8,9,10. > > 1) Pgmin(j) <Pg(j) <Pgmax(j) % j indicates buses with generator > 2) Qgmin(j) <Qg(j) <Qgmax(j) % j indicates buses with generator > 3) Pdmin(k) <Pd(k) <Pdmax(k) % k indicates buses with demand > 4) Qd(k)=Pd(k)*tan(phi(k)) % ph(k) is load P.F at bus K > Nodal active balance: > 5) Pg(n) -Pd(n)=|V(i)| sum( |Y(h,n)| .V(h)*Cos(del(n)-del(h)-teta(n,h))) > where Pg(n) is nodal generation which is calculated as: > 6) Pg(n)=sum (Pg(j)) at bus n > 7) Pd(n)=sum (Pd(k)) at bus n > teta(n,h) is the angle of Y(n,h), del(n) and del(h) are bust angle of n > and h. > Nodal reactive balance: > 8) Qg(n) -Qd(n)=|V(i)| sum( |Y(h,n)| .V(h)*Sin(del(n)-del(h)-teta(n,h))) > > 9) Vmin(n)<V(n)<Vmax(n) % voltage range at all buses. > 10) S(i,j)<Smax(i,j). transmitted apparent power from i,j must be less > than capacity of line. > > Thanks in advance > > >
