AmplNLWriter + Bonmin not working for the simplest test case

[jay-dave]

I have the following configuration:

• AmplNLWriter v0.7.1
• PowerModels v0.18.2
• Julia v1.5.4
• JuMP v0.21.4

My code to run the simple 3 bus tnep problem from the test files:
file = "path/PowerModels/test/data/matpower/case3_tnep.m"
data = PowerModels.parse_file(file)
calc_thermal_limits!(data)
bonmin_solver= JuMP.optimizer_with_attributes(() -> AmplNLWriter.Optimizer("path/Bonmin.exe"))
resultAC_bonmin = run_tnep(data, ACPPowerModel, bonmin_solver; setting = s)
(it solves with Juniper solver as done in tnep.jl file of the package)

I get the following warnings:
[warn | InfrastructureModels]: The given optimizer does not provide the SolveTime() attribute, falling back on @timed. This is not a rigorous timing value.
[warn | InfrastructureModels]: model has no results, solution cannot be built

result:
"termination_status" => OTHER_ERROR::TerminationStatusCode = 24
"objective" => NaN

I think that there is an issue with the configuration (versions) or solve definition (JuMP.optimizer_with_attributes(...)). There should be a solution with Bonmin as the test case is feasible and simple. Can someone help me out to figure out the issue?

[ccoffrin]

I am going to defer this question to @odow, it looks to be to be an issue with the AmplNLWriter and not PowerModels.

[odow]

I can't run the code because I don't know what s is.

Where did you get the Bonmin executable from?

Did the solver lot give any indication as to what went wrong?

Does this problem have integer variables? Or is it a pure LP?

Use Bonmin_jll instead

using AmplLNWriter, Bonmin_jll
bonmin_solver = () -> AmplNLWriter.Optimizer(Bonmin_jll.amplexe)

You could also try Couenne

using AmplLNWriter, Couenne_jll
bonmin_solver = () -> AmplNLWriter.Optimizer(Couenne_jll.amplexe)

[ccoffrin]

To answer the question about model classes, run_tnep + ACPPowerModel, is a nonconvex MINLP.

[jay-dave]

@odow @ccoffrin thanks!
changing the solver declaration helped as suggested. i.e. bonmin_solver = () -> AmplNLWriter.Optimizer(Bonmin_jll.amplexe)