thus you mean I can't use Q limits to limit Q in a certain range and if the limit violated the power flow will not be converted ?? Eng. Mahmoud abdallah Teaching Assistant Ain Shams University Faculty of Engineering
On Tuesday, February 18, 2014 12:08 PM, Ray Zimmerman <r...@cornell.edu> wrote: You cannot specify both reactive power and voltage. You must specify one and solve for the other. The ENFORCE_Q_LIMS option that Shri mentions simply indicates to the program that you want to change your mind about which one you are specifying in the case where a reactive power limit will be violated by specifying V. -- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Feb 18, 2014, at 11:06 AM, Abhyankar, Shrirang G. <abhy...@mcs.anl.gov> wrote: By default, power flow does not enforce gen. reactive power limits. But you can use the option ENFORCE_Q_LIMS from the mpoption options database to set limits on the reactive power generation. Do help mpoption for more info. Shri From: Mahmoud Abdallah <mahmoud_abdallah2...@yahoo.com> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Date: Tue, 18 Feb 2014 05:00:50 -0800 To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Subject: Re: ask in matpower >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 >>> >> >> >> > > >
