The point of my previous post was that the power flow was doing what you told it to (assuming I was correct about you specifying it as a PV bus). If you want the power flow to solve for the voltage at the bus, given a specified reactive power injection (which is what you seem to be expecting), then you have to specify that by changing the BUS_TYPE to PQ in the input data.
-- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Feb 14, 2014, at 2:35 AM, Mahmoud Abdallah <mahmoud_abdallah2...@yahoo.com> wrote: > dear sir > > this bus has wind thus it can't produce reactive power > > all reactive power comes from the network to bus 37 > > thus the reactive power in the power flow output should be negative at bus 37 > Eng. Mahmoud abdallah > Teaching Assistant > Ain Shams University > Faculty of Engineering > > > On Friday, February 14, 2014 12:53 AM, Ray Zimmerman <r...@cornell.edu> wrote: > Presumably it is specified as a PV bus, which means that you are asking the > power flow program to solve for the reactive power required to maintain the > specified voltage magnitude. > > Ray > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Feb 13, 2014, at 5:36 PM, Mahmoud Abdallah > <mahmoud_abdallah2...@yahoo.com> wrote: > >> dear sir >> >> I use case 39 which has wind at bus 37 >> >> the wind at bus 37 has positive active power and negative reactive power >> >> but when I use "runpf" with change in active power to be 1.5 * its old >> value >> >> I find that reactive power (of bus 37) in the result of power flow becomes >> positive ??? how >> >> Eng. Mahmoud abdallah >> Teaching Assistant >> Ain Shams University >> Faculty of Engineering > > >
