Thanks! I think if we treat the generator real and reactive powers as control variables, then the bus voltage angles and magnitudes are state variables. Can we treat these four kinds of variables as control variable at the same time? The bus voltage angles and magnitudes are not dependent on generator real and reative power when the generator values change?
Quoting Ray Zimmerman <[email protected]>: > > On Apr 29, 2008, at 11:43 AM, [email protected] wrote: > > > Dear Sir or Madam, > > Thank you very much for your help! > > And now I have some more questions about the control variables > > in OPF. > > 1.) With the data of your cases,which variables could be > > considered as > > control variables? > > 2.) In your program, 'runopf',which variables are considered as > > control > > variables? > > All voltage angles (except at the reference bus), all voltage > magnitudes and all generator real and reactive injections can be > considered as control variables. In the data, these appear in columns > 8 and 9 of the bus matrix and columns 2 and 3 of the gen matrix. > > > 3.) The data in 'Bus' matrix,the 5th and 6th columns,the shunt > > conductance > > and shunt susceptance, can they be treated as control variables? If > > yes, how to > > deal with these variables? What do these data exactly represent for? > > No, MATPOWER does not have the ability to treat these as control > variables. They are for modeling things like fixed shunt capacitors. > > > 4.) The transformer taps can be treated as control variables in > > your data? > > if yes,how to deal with them based on your data? And what do the > > data of the > > 9th column in 'branch' matrix exactly mean? > > Transformer taps are sometimes treated as controls in OPF programs, > but MATPOWER's formulation does not include this capability. The 9th > column of the branch matrix is the turns ratio of the transformer, the > tau in the attached diagram of the branch model used by MATPOWER ... > > ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.
