Independent Power Engineers Never Trust the Machine, trust the engineer!
Who are we? IPE (Independent Power Engineers) is a nonprofit organization passionate about the
power engineering industry. Our main mandate is to test and expose the different
issues and dysfunctions of different power system simulation softwares. Please note
that all of our tests are made available also on YouTube for transparency. Look for
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Product ETAP™,
Version ETAP: 4,5,6,7.0,7.1, 7.5, 11, 11.1, 12.0,12.5,12.6, 14 and 14.1
Revision All Versions/Revisions
ETAP CASE-0222
Analysis detail Transient Stability, Initial Load Flow, Adaptive Newton Raphson Precision= 0.00001 ,Max
No. of Iteration =9999,
Events Short circuit in an Overhead Line, Wrong Angle of Generator
Issue IEEE 9 Buses , Test Cases results in ETAP software does not match with validation cases ETAP
is published in It’s website
Reason OTI/ETAP company has cheated in preparing validation Test Cases
Proposed solution No
ETAP CASE-0222 Overview: This case has been one of the analysis sample for evaluating ETAP software from version 4 to version 14.1.
Open IEEE 9 bus bar benchmark network from: C:\ETAP 1410\Example-Other\IEEE9BUS\IEEE9Bus.OTI
Independent Power Engineers Never Trust the Machine, trust the engineer!
Figure 1: Power Angle (Relative) of Generators in Multi Generator Benchmark, Power System
Control and Stability by Anderson and Fouad
Figure 2: Power Angle (Relative) of Generators in Multi Generator Benchmark, What ETAP has
shown in Validation Test Cases document is published in ETAP website
Independent Power Engineers Never Trust the Machine, trust the engineer!
ETAP CASE-0222 Explanation1:
Power Angle (Relative) of Generator G2 in Anderson and Fouad book benchmark:
88.5 Degree
Power Angle (Relative) of Generator of Generator G2 in ETAP Validation Case No.4 document published in ETAP
Website: 89.8 Degree
Power Angle (Relative) of Generator of Generator G2 when we run same network in ETAP software from version
4.0 to ETAP 14.1: 91.8 Degree
This clearly proves that OTI/ETAP Company has cheated to show that results of ETAP transient stability software and
Anderson and Fouad book benchmark are matching?!
But actually ETAP software results and transient stability benchmark results has (91.8 -88.5) 3.3 Degree difference in
results, but ETAP company has cheated to show that the difference is only (88.9 -88.5) 1.3 degree
Figure 3: Power Angle (Relative) of Generators for Multi Generator Benchmark, Running
ETAP Transient stability Software from version 4.0 to 14.1
Independent Power Engineers Never Trust the Machine, trust the engineer!
Figure 4: Power Angle (Absolute) of Generators in Multi Generator Benchmark, Power System
Control and Stability by Anderson and Fouad
Figure 5: Power Angle (Absolute) of Generators in Multi Generator Benchmark, What ETAP has
shown in Validation Test Cases document is published in ETAP website
Independent Power Engineers Never Trust the Machine, trust the engineer!
ETAP CASE-0222 Explanation2:
Power Angle (Absolute) of Generators in Anderson and Fouad book benchmark: fully matches and converge to
identical Degree at t=2 seconds
Power Angle (Absolute) of Generator G2 in ETAP Validation Case No.4 document published in ETAP Website: ETAP
website tries to shows that angles of generators are converging at t=2 seconds
Power Angle (Absolute) of Generator G2 when we run same network in ETAP software from version 4.0 to ETAP
14.1: ETAP software, generators angles still does not converge or match at 120 cycle (2 seconds)
This clearly proves that OTI/ETAP Company has cheated to show that results of ETAP transient stability software
and Anderson and Fouad book benchmark are matching?!
But actually ETAP software results and transient stability benchmark results are showing totally different angles at
120 cycle (2 seconds), but ETAP Company has cheated to show that the difference is negligible and the angles are
converging at 120 cycle (2 seconds)
We just have a question? How ETAP Company can compensate damages and lost of projects due to
inaccurate results of ETAP software in last 15 years???
Figure 6: Power Angle (Absolute) of Generators for Multi Generator Benchmark, Running
ETAP Transient stability Software from version 4.0 to 14.1