Synopsis
A serious issue has been identified in the application of Variable data to the simulation in the second and subsequent simulation steps of MT Schedule and LT Plan. Users of the affected versions should update immediately to avoid the issue.
Affected Versions
The following versions of PLEXOS for Power System software are affected:
Details
By default LT Plan solves the entire horizon in a single optimization step. For this case the bulletin does not apply. But if LT Plan is configured to run in two or more steps then the problem described below can occur. MT Schedule by default will solve the simulation horizon into yearly steps. This bulletin applies to MT Schedule when running with two or more steps.
The first simulation step of LT Plan or MT Schedule is unaffected by the issue. But in the second and subsequent simulation steps the values of Variable objects is applied incorrectly to the formulation. Specifically the Variable values from step one are applied in step two, three, etc rather than the values for the appropriate step. The Variable object reporting is correct i.e. Variable [Value], [Error], [Raw Value] all report correctly, but the formulation and reporting of properties derived from the Variable values are shown with incorrect values e.g. if you were to apply a Variable to a Region [Price] then the Region [Price] in the solution would show the incorrect values.
Workarounds
No workarounds are available for this issue.
Resolution
Install the latest version of the software from the Downloads page.
The updated versions are:
For more information contact your support representative.
AUG