Software Patches

February 5, 2019

Bug Fixes

  • File Formats: For the UCTE format, changed how the ##R record is read for phase-shifting transformers. The UCTE format documentation implies that the tap ratio and phase shift are applied on "node 2" or the TO BUS side of the transformer when in fact they apply to the from (Node 1) side. Customers have verified this interpretation in other software tools so we have switched the sign on the phase angle read and taken reciprocal of the tap ratio (for SYMM and ASYM transformers)
  • File Formats: Fixed an access violation that occurred when loading a UCTE file using the 64-bit version of Simulator.
  • Transient Stability: Fixed an error when initializing the value of Qext (exciter reference) for the REEC_A, REEC_B, and REEC_C models, there was an error when Qflag = 0 AND the generator machine MVABase was different than the exciter MVABase.
  • Transient Stability: Modified the EWTGFC, WT4E, PV1E so that when checking initial limit violations they properly look at Iqhl values also.