Okay, thanks again for the answer. On Thu, Jul 7, 2022, 10:08 PM Carlos E Murillo-Sanchez < [email protected]> wrote:
> Ahmad Bariq Al Fahri wrote: > > Thank you Carlos for the information. > As in Case 9, all bus voltage is specified to be 345 kV. If the > transformer defaults ratio is 1:1, does it mean that the generator is > connected in 345 kV as well? Thank you. > > Best regards, > > Ahmad > > Dear Ahmad: > > No, it just means that the winding ratio corresponds exactly to the ratio > of the nominal voltages on both sides of the transformer. The TAP setting > corresponds to off-nominal deviations, not to the physical winding ratio. > In fact, the nominal voltages at the generator buses for case9.m are > really 16.5, 18, and 13.8 KV, while the nominal transmission voltage is > 230 KV if I recall correctly. MATPOWER only uses the (already converted to > pu) branch impedances, the system MVA base, and the off-nominal TAP ratio; > the BASE_KV column in the bus matrix is not used for power flows. > > Carlos. > >
