Hello Juliane, If you don't know reactive power capability curve then you can approximate by 0.90, 0.95 rule for synchronous generator. By which Qmax is computed by P=Pmax and 0.9 pf lagging. And Qmin is computed by P=Pmax and 0.95 pf leading. Therefore Qmax=Pmax * tan (cos^(-1)(0.9)) and Qmin= - Pmax * tan (cos^(-1)(0.95)). *Ref:J. Grainger and W. Stevenson, “Power system analysis,” McGraw-Hill, 1994*. This might help you to approximate Q limits.
Regards Mirish. On Tue, Mar 1, 2016 at 1:53 PM, Selle, Juliane Regina < [email protected]> wrote: > Hi everyone, > > > I am working on building up a specific transmission system model > (220-450kV), so I need to write my own MATPOWER cases. I know the network > structure, so building up the branch matrix is not a problem. > I also know the installed capacities (power plants, renewables, ...) at > each node, which gives me the active power generation (in % of the > installed capacity). But I don't know how to set proper values for the > reactive power generation! Does anybody have experience on how to fit the > Q-limits to the active power generation? What is your suggestion? > > I don't have any data information on the reactive power by now at all and > I have no idea how to assess realistic reactive power limits. > > > Thanks, > > Juls >
