dear sir I don't want specify reactive power I only want the change in reactive power should be negative value
thus I try to put the limit of reactive power generated from bus 37 to be only negative for example from -4.4 to -4 but power flow not consider this limits what I can do to make the reactive power generated from bus 37 to be negative values (not fixed but change in a range of negative values ) thank you in advance Eng. Mahmoud abdallah Teaching Assistant Ain Shams University Faculty of Engineering On Friday, February 14, 2014 10:33 PM, Ray Zimmerman <r...@cornell.edu> wrote: 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 >> > > >
