Thank you, Mirish, for giving me this reference. This is just fine for me. I thougth of it before, but couldn't work out properly how it works because I had some understanding problems. Now I got it :)
Regards, Juliane ________________________________ Von: [email protected] <[email protected]> im Auftrag von Mirish Thakur <[email protected]> Gesendet: Mittwoch, 2. März 2016 00:47 An: MATPOWER discussion forum Betreff: Re: reactive power limits of generators 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]<mailto:[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
