Yes the difference is due to the change in slack bus. Try running the case with and without the ENFORCE_Q_LIMS option set to see the difference caused by the change in slack bus.
-- Ray Zimmerman Senior Research Associate 211 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Jan 11, 2011, at 4:19 PM, Ray Zimmerman wrote: > If you send me the exact case you are running I may have some insight into > the solution. > > -- > Ray Zimmerman > Senior Research Associate > 211 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Dec 25, 2010, at 12:34 AM, masoomeh shaygan wrote: > >> HI >> when I increase the load in bus 7 and 9 in case9 (I prouduct the P >> and Q of This buses in 2.5284 (they are critical buses by modal >> analysis) to decrease the min eigenvalue of system to 0.0487, the >> slack bus converting to PQ bus and bus 2 is new slack bus,all voltage >> of buses decreas in this case but the voltage of bus 1(new pq bus) >> increase to 1.103 why is it?is it for change slack from bus 1 to bus >> 2? >> >> thanks very much for your help >> >> On 12/23/10, Ray Zimmerman <[email protected]> wrote: >>> Could you provide an example that exhibits the behavior you refer to? I'm >>> not sure I know what you mean. >>> >>> -- >>> Ray Zimmerman >>> Senior Research Associate >>> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >>> phone: (607) 255-9645 >>> >>> >>> >>> On Dec 21, 2010, at 2:26 PM, masoomeh shaygan wrote: >>> >>>> Hi dear matpower user >>>> >>>> I have a question,when I run NR power flow in mathpower (by >>>> increasing load power) the Slak bus Changed in some iteration , >>>> is any way that slack bus isn't changed and stay fix in all iteration? >>>> Thanks >>>> >>> >>> >>> >>> >> > > >
