I have a 20000 bus WECC system in PSSE raw format. I am trying to run the DC power flow, but the total of the power injections that I got from MATPOWER does not equal to zero. Are the voltage angles obtained in this case wrong?
Thanks, Vikram On Tue, Apr 3, 2018 at 6:46 AM, Ray Zimmerman <[email protected]> wrote: > There is no need to check. The slack bus active power will be adjusted to > make the injections sum to zero. And the DC power flow in MATPOWER is a > lossless approximation. That is, it assumes the losses are zero. > > Ray > > > On Mar 28, 2018, at 2:28 PM, vikram reddy <[email protected]> > wrote: > > Hi, > > I am working on a 20000 bus system and running a DC load flow. Now, the > power injection vector computed as > > Pbus = real(makeSbus(baseMVA, bus, gen)) - Pbusinj - bus(:, GS) / > baseMVA; > > In general, the total of the power injection vector should be zero > implying generation=load+losses. MATPOWER does not do the checking if the > total of injection vector is zero. > > 1. Why does MATPOWER not check if the total of injection vector goes to > zero? Is it not important? > 2. What happens if the injection vector is not zero and running the DC > load flow? I assume the voltage angles thus obtained will have an error. > 3. Assuming losses is the total sum of Pbus vector, how should the losses > be distributed? > > Thanks, > Vikram > > > >
