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. <[email protected]> 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 <[email protected]> > Reply-To: MATPOWER discussion forum <[email protected]> > Date: Tue, 18 Feb 2014 05:00:50 -0800 > To: MATPOWER discussion forum <[email protected]> > 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 <[email protected]> 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 > <[email protected]> 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 <[email protected]> >> 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 >> <[email protected]> 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 >> >> >> > > >
