Support ThreeWindingTransformer outages in NetworkModification by Copilot · Pull Request #289 · Sienna-Platform/PowerNetworkMatrices.jl

Copilot · 2026-04-14T18:52:20Z

Passing a PSY.ThreeWindingTransformer directly as an outage component errored, requiring users to manually construct internal ThreeWindingTransformerWinding objects. This PR auto-decomposes 3WT components into their winding arcs.

Description

Core changes (`src/network_modification.jl`)

_classify_outage_component! for PSY.ThreeWindingTransformer: Replace error with automatic decomposition into available winding arcs (skips unavailable windings)
NetworkModification(mat, ::PSY.ThreeWindingTransformer): New constructor for full transformer outage
_classify_branch_modification for PSY.ThreeWindingTransformer: New method decomposing into per-winding classification
Separate :transformer3w from :direct in arc classification: Compute Ybus delta directly via ybus_branch_entries(tr) instead of routing through _compute_arc_ybus_delta, which fails due to BA-matrix susceptance vs raw winding susceptance mismatch
Use get_name instead of PSY.get_name in classification info messages and the ACTransmission constructor — ThreeWindingTransformerWinding lacks a name field so PSY.get_name errors; PNM.get_name dispatches correctly for both regular branches and windings

Usage

sys = build_system(PSITestSystems, "case10_radial_series_reductions")
trf = first(get_components(ThreeWindingTransformer, sys))
vptdf = VirtualPTDF(sys)

# Full 3WT outage — previously errored
mod = NetworkModification(vptdf, trf)  # 3 arc modifications

# Single winding trip (partial outage)
w1 = ThreeWindingTransformerWinding(trf, 1)
mod_w1 = NetworkModification(vptdf, w1)  # 1 arc modification

# Via Outage supplemental attribute
outage = GeometricDistributionForcedOutage(; ...)
add_supplemental_attribute!(sys, trf, outage)
mod = NetworkModification(vptdf, sys, outage)  # works

Tests (`test/test_network_modification.jl`)

Four new test sets: full 3WT outage, single winding outage, partial outage with disabled winding, and outage via PSY.Outage supplemental attribute.

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- Replace error in _classify_outage_component! for PSY.ThreeWindingTransformer with automatic decomposition into available winding arcs - Add NetworkModification(mat, branch::PSY.ThreeWindingTransformer) constructor - Add _classify_branch_modification for PSY.ThreeWindingTransformer - Handle 3WT Ybus delta directly via ybus_branch_entries to avoid BA-matrix vs winding susceptance mismatch - Use get_name instead of PSY.get_name for ThreeWindingTransformerWinding compat Agent-Logs-Url: https://github.com/NREL-Sienna/PowerNetworkMatrices.jl/sessions/7950c45a-eba1-4cd1-a6d6-3e4d6238e999 Co-authored-by: jd-lara <16385323+jd-lara@users.noreply.github.com>

…cation Agent-Logs-Url: https://github.com/NREL-Sienna/PowerNetworkMatrices.jl/sessions/7950c45a-eba1-4cd1-a6d6-3e4d6238e999 Co-authored-by: jd-lara <16385323+jd-lara@users.noreply.github.com>

github-actions · 2026-04-14T20:23:38Z

Performance Results

Precompile Time

Main	This Branch	Delta
2.265 s	2.358 s	+4.1%

Execution Time

Test	Main	This Branch	Delta
matpower_ACTIVSg2000_sys-Build PTDF First	2.11 s	2.423 s	+14.8%
matpower_ACTIVSg2000_sys-Build PTDF Second	517.3 ms	73.0 ms	-85.9%
matpower_ACTIVSg2000_sys-Build Ybus First	11.9 ms	11.1 ms	-6.1%
matpower_ACTIVSg2000_sys-Build Ybus Second	11.5 ms	10.8 ms	-6.3%
matpower_ACTIVSg2000_sys-Build LODF First	127.6 ms	143.0 ms	+12.1%
matpower_ACTIVSg2000_sys-Build LODF Second	139.1 ms	195.7 ms	+40.7%
matpower_ACTIVSg2000_sys-Build VirtualMODF First	2.474 s	4.472 s	+80.8%
matpower_ACTIVSg2000_sys-Build VirtualMODF Second	522.7 ms	1.152 s	+120.4%
matpower_ACTIVSg2000_sys-VirtualMODF Query 10 rows	538.3 ms	550.4 ms	+2.2%
matpower_ACTIVSg2000_sys-Radial network reduction First	574.0 ms	573.7 ms	-0.1%
matpower_ACTIVSg2000_sys-Radial network reduction Second	0.8 ms	0.8 ms	+1.8%
matpower_ACTIVSg2000_sys-Degree two network reduction First	2.001 s	1.997 s	-0.2%
matpower_ACTIVSg2000_sys-Degree two network reduction Second	1.1 ms	1.1 ms	-4.9%
Base_Eastern_Interconnect_515GW-Build Ybus First	882.0 ms	1.081 s	+22.6%
Base_Eastern_Interconnect_515GW-Build Ybus Second	747.1 ms	552.9 ms	-26.0%
Base_Eastern_Interconnect_515GW-Radial network reduction First	148.8 ms	36.0 ms	-75.8%
Base_Eastern_Interconnect_515GW-Radial network reduction Second	36.8 ms	35.5 ms	-3.6%
Base_Eastern_Interconnect_515GW-Degree two network reduction First	399.6 ms	386.9 ms	-3.2%
Base_Eastern_Interconnect_515GW-Degree two network reduction Second	48.1 ms	44.5 ms	-7.5%

codecov · 2026-04-14T20:28:28Z

Codecov Report

❌ Patch coverage is 92.30769% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.67%. Comparing base (abede1d) to head (bcfc2a4).
⚠️ Report is 121 commits behind head on main.

Files with missing lines	Patch %	Lines
src/network_modification.jl	92.30%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #289       +/-   ##
==========================================
+ Coverage   0.07%   79.67%   +79.59%     
==========================================
  Files         38       38               
  Lines       3778     3794       +16     
==========================================
+ Hits           3     3023     +3020     
+ Misses      3775      771     -3004

Flag	Coverage Δ
unittests	`79.67% <92.30%> (+79.59%)`	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/network_modification.jl	`83.09% <92.30%> (+83.09%)`	⬆️

... and 35 files with indirect coverage changes

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…-winding-transformer-outages # Conflicts: # test/test_network_modification.jl

jd-lara · 2026-05-29T18:22:11Z

@m-bossart I just wrapped up this PR to accept 3WT outages but it only does full outage not partial.

github-actions · 2026-05-29T18:22:37Z

+        push!(direct_mods, ArcModification(
+            arc_idx, -b_arc,
+            YBUS_ELTYPE(-Y11), YBUS_ELTYPE(-Y12),
+            YBUS_ELTYPE(-Y21), YBUS_ELTYPE(-Y22),
+        ))


[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

push!(direct_mods, ArcModification(

arc_idx, -b_arc,

YBUS_ELTYPE(-Y11), YBUS_ELTYPE(-Y12),

YBUS_ELTYPE(-Y21), YBUS_ELTYPE(-Y22),

))

push!(

direct_mods,

ArcModification(

arc_idx, -b_arc,

YBUS_ELTYPE(-Y11), YBUS_ELTYPE(-Y12),

YBUS_ELTYPE(-Y21), YBUS_ELTYPE(-Y22),

),

)

github-actions · 2026-05-29T18:22:37Z

+        if !get_equivalent_available(winding)
+            continue
+        end
+        append!(mods, _classify_branch_modification(nr, arc_lookup, arc_susceptances, winding))


[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

append!(mods, _classify_branch_modification(nr, arc_lookup, arc_susceptances, winding))

append!(

mods,

_classify_branch_modification(nr, arc_lookup, arc_susceptances, winding),

)

github-actions · 2026-05-29T18:22:38Z

+        return [ArcModification(
+            arc_idx, -b_arc,
+            YBUS_ELTYPE(-Y11), YBUS_ELTYPE(-Y12),
+            YBUS_ELTYPE(-Y21), YBUS_ELTYPE(-Y22),
+        )]


[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

return [ArcModification(

arc_idx, -b_arc,

YBUS_ELTYPE(-Y11), YBUS_ELTYPE(-Y12),

YBUS_ELTYPE(-Y21), YBUS_ELTYPE(-Y22),

)]

return [

ArcModification(

arc_idx, -b_arc,

YBUS_ELTYPE(-Y11), YBUS_ELTYPE(-Y12),

YBUS_ELTYPE(-Y21), YBUS_ELTYPE(-Y22),

),

]

github-actions · 2026-05-29T18:22:38Z

+    star_bus = first(b for b in PSY.get_components(PSY.ACBus, sys2)
+    if PSY.get_number(b) == star_num)


[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

star_bus = first(b for b in PSY.get_components(PSY.ACBus, sys2)

if PSY.get_number(b) == star_num)

star_bus = first(

b for b in PSY.get_components(PSY.ACBus, sys2)

if PSY.get_number(b) == star_num

)

Copilot

Pull request overview

This PR adds direct support for using PSY.ThreeWindingTransformer components as network modification outages by decomposing them into winding-level arc modifications, while adding targeted tests for 3WT outage behavior.

Changes:

Adds NetworkModification and outage-classification support for full ThreeWindingTransformer outages.
Handles 3WT Ybus deltas directly and tracks real-bus islanding for full 3WT outages.
Adds regression tests for full, partial, supplemental-attribute, Ybus, PTDF, and VirtualMODF 3WT outage paths.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
`src/network_modification.jl`	Implements 3WT decomposition, classification, Ybus delta handling, and real-bus islanding detection.
`test/test_network_modification.jl`	Adds basic coverage for full/single/partial 3WT outages and outage attributes.
`test/test_3wt_outage.jl`	Adds deeper validation against PTDF/Ybus references and cache behavior for 3WT outages.

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Copilot

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

+    for winding_num in 1:3
+        winding = ThreeWindingTransformerWinding(component, winding_num)
+        if !get_equivalent_available(winding)
+            continue
+        end


m-bossart · 2026-05-31T21:26:25Z

+    mods = ArcModification[]
+    for winding_num in 1:3
+        winding = ThreeWindingTransformerWinding(branch, winding_num)
+        if !get_equivalent_available(winding)
+            continue


I think this is correct, there seems to be a discrepancy in where phase shifting is allowed with respect to outages

m-bossart · 2026-05-31T21:16:22Z

+@testset "is_islanding is true for radial-terminal full 3WT outage" begin
+    sys = PSB.build_system(PSB.PSITestSystems, "case10_radial_series_reductions")
+    vptdf = VirtualPTDF(sys)
+    trf = first(PSY.get_components(PSY.ThreeWindingTransformer, sys))


use only instead of first so it is clear that there is only one ThreeWindingTransformer in this system and that it will cause an island when outaged. Applies to other tests below as well.

m-bossart · 2026-05-31T21:22:00Z

+    mod = NetworkModification(vptdf, trf)
+    arc_ax = PNM.get_arc_axis(vptdf)
+    wind = [am.arc_index for am in mod.arc_modifications]
+    star_num = unique([arc_ax[e][2] for e in wind])[1]


# star bus is to bus of three winding transformer arcs star_num = arc_ax[wind[1]][2]

m-bossart · 2026-05-31T21:25:09Z

+    # Single winding outage
+    for w in 1:3
+        winding = PNM.ThreeWindingTransformerWinding(trf, w)
+        mod = NetworkModification(vptdf, winding)


This seemingly is supporting partial outages. Can you clarify the comment that said they were not supported?

m-bossart · 2026-05-31T21:26:25Z

+    mods = ArcModification[]
+    for winding_num in 1:3
+        winding = ThreeWindingTransformerWinding(branch, winding_num)
+        if !get_equivalent_available(winding)
+            continue


I think this is correct, there seems to be a discrepancy in where phase shifting is allowed with respect to outages

m-bossart · 2026-05-31T21:30:24Z

-    )
+    for winding_num in 1:3
+        winding = ThreeWindingTransformerWinding(component, winding_num)
+        if !get_equivalent_available(winding)


If a winding is available but the parent transformer is not, get_equivalent_available will return available=true. I think that the parent transformer being unavailable should over-ride this?

m-bossart · 2026-05-31T21:34:40Z

+    mod = NetworkModification(vptdf, sys, outage)
+    @test mod.is_islanding == true
+end
+


Add a test where is_islanding is false for a ThreeWindingTransformer full outage (i.e. a case where only the star bus is islanded)

Initial plan

b0ed022

Copilot AI assigned Copilot and jd-lara Apr 14, 2026

Copilot started work on behalf of jd-lara April 14, 2026 18:52 View session

Copilot AI linked an issue Apr 14, 2026 that may be closed by this pull request

Support ThreeWindingTransformer outages in NetworkModification #287

Open

Copilot AI and others added 2 commits April 14, 2026 19:23

Add tests for ThreeWindingTransformer outage support in NetworkModifi…

bcfc2a4

…cation Agent-Logs-Url: https://github.com/NREL-Sienna/PowerNetworkMatrices.jl/sessions/7950c45a-eba1-4cd1-a6d6-3e4d6238e999 Co-authored-by: jd-lara <16385323+jd-lara@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Add support for ThreeWindingTransformer in NetworkModification~~ Support ThreeWindingTransformer outages in NetworkModification Apr 14, 2026

Copilot AI requested a review from jd-lara April 14, 2026 19:36

Copilot finished work on behalf of jd-lara April 14, 2026 19:36

Merge remote-tracking branch 'origin/main' into copilot/support-three…

623a5ef

…-winding-transformer-outages # Conflicts: # test/test_network_modification.jl

jd-lara marked this pull request as ready for review May 29, 2026 18:21

updates for 3W buses

4b85892

jd-lara requested a review from m-bossart May 29, 2026 18:21

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m-bossart reviewed May 31, 2026

View reviewed changes

		star_bus = first(b for b in PSY.get_components(PSY.ACBus, sys2)
		if PSY.get_number(b) == star_num)

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Core changes (src/network_modification.jl)

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Copilot AI commented Apr 14, 2026 •

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