True, except for the corrections made below … On Aug 6, 2013, at 11:02 AM, spyros gian <[email protected]> wrote:
> Dear Dr Zimmerman, > > In our class, the followings were mentioned for the ACOPF, and I would like > to verify with you: > > -> in the mpc.bus matrix, the columns: > 'area', and 'zone' : not taken into account. Thus we can let them have a > value of '1'. Area can be used for output summaries, but it does not affect the computations. > 'basekV' : not taken into account. The results are shown in > per unit after all. > 'Vm' and 'Va' : not taken into account. Thus we can let them have a > value of '1' and '0' respectively. These provide starting voltages. Many of the solvers ignore this, but some do not. For example, minopf does use it as a starting point. > ->in the mpc.gen matrix, the column: > 'Vg' : not taken into account. Thus we can let it > have a value of '1'. > > -> in the mpc.branch matrix, the columns: > 'ratio', and 'angle': not taken into account. Thus we can let them both > have a value of '0'. These are *not* ignored. These are the parameters that determine the off-nominal tap ratio of a transformer and the phase shift angle of a phase shifting transformer. Zero means that it is a transmission line and not a transformer. > 'rateA' : if we want no line constraints, we can give > it a large value e.g. '99999' Better to give it a value of 0 if you want no line constraints. If you use a large number the constraints are still included in the problem (increasing the size) though they will never bind. Setting them to 0 actually removes them from the problem. > 'rateB', and 'rateC' : not taken into account. We can let them '0' > (normal operation). > > Do you agree? > > Thank you > Syros -- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645
