Fix PSSE raw import for gen_status at load buses

[KSepetanc]

Fixes #932 .

PSSE ignores generators at load buses (bus type 1). It does not use this flag to determine if the generator is PV or PQ which is different from Matpower. Instead, it uses Machine Control Mode parameter found in panel Machine Data Record -> Wind Data -> Control Mode or in the Machine sheet.

As such fix needs to be implemented only for PSSE and there are no changes for Matpower. Thus, the only change is in src\io\psse.jl.

Consider adding Memento warning before merging.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.57%. Comparing base (30e3d39) to head (a7190d8).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #934      +/-   ##
==========================================
- Coverage   94.06%   93.57%   -0.50%     
==========================================
  Files          43       42       -1     
  Lines        9665     9627      -38     
==========================================
- Hits         9091     9008      -83     
- Misses        574      619      +45     

Files with missing lines	Coverage Δ
src/io/psse.jl	96.32% <100.00%> (-0.60%)	⬇️

... and 19 files with indirect coverage changes

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[KSepetanc]

@ccoffrin can you review this please?

[ccoffrin]

Sorry for the delay @KSepetanc. I have no way of verifying these semantics of PSSE. @jd-lara or @frederikgeth are you able to verify this behavior?

@KSepetanc, before merging we will need to add a test for this behavior so that we don't have a future regression.

[frederikgeth]

not able to verify, sorry, but can confirm he actual status of a machine is determined both by its status flag and the bus type code.

[KSepetanc]

@ccoffrin I can not find any network in the PowerModels test/data/pti that has generator placed at load bus. I am not very comfortable modifying those frankenstein networks (presumably frankenstein_70.raw) as I do not know repercussions on other tests. I will need help with this.

test construct should be something like this (in test/psse.jl after transformer status tests):

    @testset "generator status" begin
        data_pti = PowerModels.parse_file("../test/data/pti/frankenstein_70.raw")

        gen_off = Set(["8", "9"]) # put names of inactive gens here
        for (i,gen) in data_pti["gen"]
            if i in gen_off
                @test gen["gen_status"] == 0
            else
                @test gen["gen_status"] == 1
            end
        end
    end

[KSepetanc]

I have modified frankenstein_70.raw at but 1005 to load bus. Test has been added.

Do you think we need to add memento log in src/io/psse.jl line 214 for the case when bus type is 1 and gen["STAT"] is 1?

[KSepetanc]

@ccoffrin do you have someone else who can check this? I would like to close this issue soon.