1. Thanks. Yes, currently the best way is just to e-mail contributions to me directly. 2. You are correct. So, it’ s not that the physical voltages at the bus and generator can be different from one another, but that the physical voltage at the bus and generator can be different from the setpoint (i.e. the desired voltage). That is the setpoint is a control setting that the generator will attempt to maintain, but if it reaches a reactive power limit, it may not be physically capable of maintaining the desired voltage.
Best, Ray > On Feb 26, 2016, at 9:49 AM, Dirk Toewe <[email protected]> wrote: > > Dear Mr. Zimmerman, > > 1. I am currently mostly programming in Java, only calling Octave and > MatPower for the simulation. The Matlab/Octave skills of mine are not the > best. But I will try to write such a method. What is the preferred way to > contribute? Shall I just E-Mail it to You or the list? > 2. My understanding of the MatPower grid model is that all the generators are > directly connected to their bus with a zero impedance line. If the voltage at > the generator was different to the one at the bus, wouldn't that mean an > "infinite current" between generator and bus? > > Best regards > Dirk > > On 26.02.2016 14:44, Ray Zimmerman wrote: >> 1. There is unfortunately no a single function that does comprehensive >> sanity checking of the data, though this would be a very welcome >> contribution. >> 2. Think of the generator’s voltage setpoint VG as an input to the power >> flow problem (it’s an output for the OPF problem). If the generator has >> sufficient reactive power capability, that setpoint will generally be >> maintained, but if the reactive power limits are enforced >> ('pf.enforce_q_lims' option), then the bus voltage at the solution will >> depart from the generator’s setpoint. >> >> Ray >> >> >> >>> On Feb 25, 2016, at 2:25 PM, Dirk Toewe < >>> <mailto:[email protected]>[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Hello Everyone, >>> >>> i am currently working on the Creation and Simulation of a few power grid >>> models at university. First of all i have to say that i really like the >>> great documentation and the simplicity of the MatPower data format and API. >>> But I still have some problems with getting the power flow simulation to >>> converge from time to time. Usually it's just some silly mistake like not >>> having set the bus or generator voltages in the model. This leads me to the >>> following questions: >>> Is there a "Sanity Check"-Method, that checks a model for the most common >>> mistakes? >>> Why is there even a voltage setpoint (VG) for the generators? Doesn't it >>> always have to be exactly equal to the bus' voltage? >>> >>> Best regards >>> Dirk >> >
