ESST1A model and test

[luisdi97]

Hello, I'm adding the IEEE Type ST1A Excitation System, ESST1A model, and a test for it.

[codecov[bot]]

Codecov Report

Merging #348 (069d618) into main (f50405c) will decrease coverage by 0.37%. The diff coverage is 71.42%.

Additional details and impacted files

[](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna) ```diff @@ Coverage Diff @@ ## main #348 +/- ## ========================================== - Coverage 87.48% 87.11% -0.37% ========================================== Files 65 65 Lines 8619 8794 +175 ========================================== + Hits 7540 7661 +121 - Misses 1079 1133 +54 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `87.11% <71.42%> (-0.37%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna) | Coverage Δ | | |---|---|---| | [src/PowerSimulationsDynamics.jl](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna#diff-c3JjL1Bvd2VyU2ltdWxhdGlvbnNEeW5hbWljcy5qbA==) | `100.00% <ø> (ø)` | | | [src/post\_processing/post\_proc\_generator.jl](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna#diff-c3JjL3Bvc3RfcHJvY2Vzc2luZy9wb3N0X3Byb2NfZ2VuZXJhdG9yLmps) | `89.70% <43.58%> (-9.04%)` | :arrow_down: | | [src/base/simulation\_results.jl](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna#diff-c3JjL2Jhc2Uvc2ltdWxhdGlvbl9yZXN1bHRzLmps) | `67.75% <75.00%> (+0.28%)` | :arrow_up: | | [src/models/generator\_models/avr\_models.jl](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna#diff-c3JjL21vZGVscy9nZW5lcmF0b3JfbW9kZWxzL2F2cl9tb2RlbHMuamw=) | `99.08% <94.73%> (-0.92%)` | :arrow_down: | | [...rc/initialization/generator\_components/init\_avr.jl](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna#diff-c3JjL2luaXRpYWxpemF0aW9uL2dlbmVyYXRvcl9jb21wb25lbnRzL2luaXRfYXZyLmps) | `95.48% <96.87%> (+0.14%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/NREL-Sienna/PowerSimulationsDynamics.jl/pull/348/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna)

[rodrigomha]

Closes #347