Software Patches

June 18, 2020

Features and Improvements

  • Transient Stability: Added a new feature when saving plot images to file automatically from within the transient stability tool. Previously when increasing the resolution to large values that look good in an image or document, the text would become smaller as you increased the resolution of the image. This could be overcome by changing all the fonts sizes but this is very cumbersome. To fix this you may now instead simply apply a scalar number which applies to all text on the image. This if you make an image about 3 times larger than your screen, just set the scalar to 3.0 and all fonts are appropriately scaled.
  • Transient Stability: Made minor modifications to the look of a plot image. Gridlines and tick marks on axes were previously 2 pixels wide and are now 1 pixel instead. There was a drop-shadow around the legend which has been removed.
  • Transient Stability: Redesigned the Auto-Insert Distance Relay Form, and added the capability to specify "Breaker Operating Time" and "Zone 1 Operating Time"
  • Transient Stability: When using a Horizontal Axis that is NOT Time, if a Title for the axis is left blank we now automatically add a title showing the object and field being shown on that axis. This makes it easier to see what the axis is.
  • Bug Fixes

    • Oneline Diagrams: Added some error handling code to prevent problems when trying to open a oneline file in one version of Simulator while a different version of Simulator is the process of writing the same oneline file.
    • Transient Stability: Creating a transient stability plot series for the Model Plane Meets field would not work when loading from an auxiliary file. This has been fixed.
    • Transient Stability: Fixed a nuisance GUI bug with displaying this initial state derivatives for a synchronous machine that uses the H6E governor. That governor was initialized properly but the reported initial Pmech output of the governor was wrong. When the simulation actually began however that was corrected before the first time step so it only impacted the GUI reporting of the initial state derivative of the speed of the machine.
    • Transient Stability: When loading the Voltage Dependent Current Limiter (VDL) curves for the REEC_A, REEC_C, and REEC_D models, Simulator would not allow consecutive points to have the same voltage and omitting the duplicate voltage entry. This meant that a VDL table such as (0,0), (0.9, 0.0), (0.9, 3.0), (2.0, 3.0) which a user was making to indicate that the limit drops from 3.0 per unit down to 0.0 per unit suddenly at exactly 0.9 voltage was not possible. Simulator would end up ignoring the point (0.9, 3.0) because it had the same voltage of 0.9 as the previous point. This has been changed so that consecutive points can now have the same voltage as long as their current is different for this curve.
    • Transient Stability: The new feature for a generic limit monitoring using impedance relays had an error in how the region was defined. This has been fixed.
    • Transient Stability: Modified Captions for Generic Limit Monitors of Apparent Impedance to better explain
    • Transient Stability: Modified all the edit boxes, check boxes, and such on the transient stability dialog so that when an Auxiliary File is opened from anywhere in PowerWorld that this dialog box automatically updates itself to reflect these new settings.