Source power ans voltage is continuously oscillating after dynamic simulation of 3 phase fault
I have an equivalent system with 5 buses. two of the buses are hydro generator buses and two are modeled as equivalent sources with given short circuit MVA as machine with GENCLS dynamic model and base MVA as per the given MVA. this was followed by the answer in one of the queries in this forum. the steady state simulation is stable and initial condition is ok, but after applying 3 phase fault one of the equivalent source modelled is not recovering after fault and there are continuous power oscillations, because of that other machines also giving oscillating power. can any one please help me how can I solve this problem. please suggest how can i share the raw and dyr files for further investigation.
---Raw Data File--- @!IC,SBASE,REV,XFRRAT,NXFRAT,BASFRQ 0, 100.00, 36, 0, 1, 50.00 / PSS(R)E Xplore-36.1 WED, MAR 04 2026 15:04
GENERAL, THRSHZ=0.0001, PQBRAK=0.7, BLOWUP=5.0, MaxIsolLvls=4, CAMaxReptSln=20, ChkDupCntLbl=0 GAUSS, ITMX=1000, ACCP=1.6, ACCQ=1.6, ACCM=1.0, TOL=0.0001 NEWTON, ITMXN=1000, ACCN=1.0, TOLN=0.1, VCTOLQ=0.1, VCTOLV=0.00001, DVLIM=0.99, NDVFCT=0.99 ADJUST, ADJTHR=0.005, ACCTAP=1.0, TAPLIM=0.05, SWVBND=100.0, MXTPSS=99, MXSWIM=10 TYSL, ITMXTY=20, ACCTY=1.0, TOLTY=0.00001 SOLVER, FNSL, ACTAPS=0, AREAIN=0, PHSHFT=0, DCTAPS=0, SWSHNT=0, FLATST=0, VARLIM=99, NONDIV=0 RATING, 1, "RATE1 ", "RATING SET 1 " RATING, 2, "RATE2 ", "RATING SET 2 " RATING, 3, "RATE3 ", "RATING SET 3 " RATING, 4, "RATE4 ", "RATING SET 4 " RATING, 5, "RATE5 ", "RATING SET 5 " RATING, 6, "RATE6 ", "RATING SET 6 " RATING, 7, "RATE7 ", "RATING SET 7 " RATING, 8, "RATE8 ", "RATING SET 8 " RATING, 9, "RATE9 ", "RATING SET 9 " RATING,10, "RATE10", "RATING SET 10 " RATING,11, "RATE11", "RATING SET 11 " RATING,12, "RATE12", "RATING SET 12 " SWDRATNAM, 1, "RATE1 ", 0, "MVA", "SWD RATING SET 1 " SWDRATNAM, 2, "RATE2 ", 0, "MVA", "SWD RATING SET 2 " SWDRATNAM, 3, "RATE3 ", 0, "MVA", "SWD RATING SET 3 " SWDRATNAM, 4, "RATE4 ", 0, "MVA", "SWD RATING SET 4 " SWDRATNAM, 5, "RATE5 ", 0, "MVA", "SWD RATING SET 5 " SWDRATNAM, 6, "RATE6 ", 0, "MVA", "SWD RATING SET 6 " SWDRATNAM, 7, "RATE7 ", 0, "MVA", "SWD RATING SET 7 " SWDRATNAM, 8, "RATE8 ", 0, "MVA", "SWD RATING SET 8 " SWDRATNAM, 9, "RATE9 ", 0, "MVA", "SWD RATING SET 9 " SWDRATNAM, 10, "RATE10", 0, "MVA", "SWD RATING SET 10 " SWDRATNAM, 11, "RATE11", 0, "MVA", "SWD RATING SET 11 " SWDRATNAM, 12, "RATE12", 0, "MVA", "SWD RATING SET 12 " 0 / END OF SYSTEM-WIDE DATA, BEGIN BUS DATA @! I,'NAME ', BASKV, IDE,AREA,ZONE,OWNER, VM, VA, NVHI, NVLO, EVHI, EVLO 174445,'MUZAFRN4 ', 400.0000,2, 72, 171, 55,1.00000, -2.6734,1.10000,0.90000,1.10000,0.90000 194001,'KANPRAYAG ', 400.0000,1, 72, 191, 1,0.99960, 0.7184,1.10000,0.90000,1.10000,0.90000 194052,'SRINAGARPT ', 400.0000,3, 72, 191, 2,1 ...
