Software Patches

March 28, 2018

Features and Improvements

  • File Formats: When loading an EPC file, if a generator is set to cont_mode = 2, but the power factor given is 0.0, then this is inconsistent data. In this situation, Simulator will now set pf = 0.01 and write a warning to the message log.
  • File Formats: When loading an EPC file, if a generator is set to cont_mode = 3, but the power factor given is 0.0, then this is impossible data (would result in infinite Mvar output). In this situation, Simulator will now change the cont_mode to 1 which is equivalent to setting AVR = NO in Simulator. A warning will also be written to the message log.
  • Bug Fixes

    • Transient Stability: Fixed bug in the initialization of the WTGTRQ_A model when the MVABase of the model is different than the MVA Base of the generator.
    • Transient Stability: For REPC_B model, the specification of RefFlag = 2 (constant power factor control) was not being handle properly and was being treated internally instead as RefFlag = 1 (constant voltage). This has been fixed.
    • Transient Stability: For REPC_B model, when specifying RefFlag = 2 (constant power factor), if the real power (P) is zero (<0.0001), then we now instead treat RefFlag = 0 (constant Q). This was done because the initial power factor does not make any sense when P = 0.