Under Increased Load, Conservation Voltage Reduction Optimization Solutions Becomes Increasingly Irrational and PFService Eventually Crashes (Doc ID 2898361.1)

Last updated on OCTOBER 10, 2022

Applies to:

Symptoms

On : 2.4.0.1.0 version, NMS Infrastructure

Conservation Voltage Reduction (CVR) problems.

PFService was not properly handling optimizations with primary tapped transformers.

Voltage Frequency plots were not displayed properly. (The initial voltage values were being skewed.)
 For example the initial voltage conditions were within ANSI range  but the after results were outside of the ANSI range. When looking at the frequency plot for the results the showed the initial voltage values being outside the ANSI voltage range which was not correct.

Returned results would get increasingly irrational and then PFService would crash.
 
PFService should not core, and results should always make sense.

The issue can be reproduced at will with the following steps:
1) Locate an area of the model that contains a primary tapped xfmr
2) Switch viewer to study mode
3) Run a CVR optimization for the area fed by T241
4) Ensure the plan results look correct
5) Ensure the voltage distribution plot matches the actual solved voltages and is not skewed

Changes

Cause

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