Software Patches

September 11, 2013

Features and Improvements

  • File Formats: Added support for reading NDLIM records from an hdbexport CSV file. Entries are read into a bus record's bus-specific limit monitoring settings allow there to be specific high/low voltage for particular nodes.
  • Transient Stability: Added special treatment for wind turbine models which specify a low voltage active current management as a piecewise linear function. It was possible for the network boundary solution to oscillate when the voltage solution was very near the corner points at Lvpnt0 and Lvpnt1. This will not happen now.
  • Bug Fixes

    • Auxiliary Files (SCRIPT and DATA Sections): When using the AUX file script command LoadAXD to open an AXD file into a oneline, if the specified oneline diagram did not exist, then an access violation occurred. This has been fixed so that instead if the oneline does exist we automatically create a new oneline and open the AXD into that.
    • File Formats: Fixed error when loading an Areva hdbexport CSV file if a blank line exists.
    • GIC: modified to allow Custom fields for TGICXFormer object. It will just pass through the value for the underlying Three-winding transformer object. It it doesn't have an underlying three-winding object, then it passes through the value for the High winding BRANCH object.
    • Optimal Power Flow (OPF): Modified the calculation of the "slack cost" and sum of MVA violations when monitoring an enforceable line MVA constraint is encoutered. The actual OPF solution (dispatch and prices) were correct, but the reported total slack cost and sum of MVA violations was not correct when unenforceable limits encountered.
    • Transient Stability: Corrected handling of the controller deadband (db) on LCFB1 model. When greater than db or less than -db we were not properly shifting the signal up or down by db.
    • Transient Stability: Modified to support the GENDCO model by treating it purely as a GENROU model. Presently Simulator does not yet implement any DC offset modeling.
    • Transient Stability: On plot, a hint appears instructing you how to zoom in or out on the chart. The hint has been corrected to instruct you to click and move RIGHT or LEFT to zoom in and out. Previously it said UP or DOWN which wasn't correct.
    • User Interface Dialogs: Added fix for GUI problem in the contingency analysis dialog. In DC mode the radio group to choose the solution method was completely disabled, which did not allow users to choose between "DC" and "DC with phase shifters". The fix was to only disable the ac solution button inside the radio group.