use the helpers to reduce reactive power

[jd-lara]

Improving the reduction code to enable the reduction injectors that only supply reactive power.

This PR requires Sienna-Platform/PowerSystems.jl#1645

[github-actions]

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Suggested change

	forces_keep = PSY.supports_active_power(c) ||
	(!reduce_reactive_power_injectors && PSY.supports_reactive_power(c))
	forces_keep =
	PSY.supports_active_power(c) ||
	(!reduce_reactive_power_injectors && PSY.supports_reactive_power(c))

[github-actions]

[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

	kept = PNM.get_reduction(adj, sys, DegreeTwoReduction(; reduce_reactive_power_injectors = false))
	kept = PNM.get_reduction(
	adj,
	sys,
	DegreeTwoReduction(; reduce_reactive_power_injectors = false),
	)

[Copilot]

Pull request overview

This PR adjusts degree-two network reduction so reactive-only injection hosts can be reduced by default while still allowing callers to keep them via reduce_reactive_power_injectors = false.

Changes:

• Updates system-derived irreducible bus selection to use PowerSystems active/reactive support traits.
• Wires the DegreeTwoReduction option through AdjacencyMatrix.get_reduction.
• Adds regression tests for a degree-2 bus hosting only a SynchronousCondenser.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/reduction_helpers.jl	Applies active/reactive trait checks when deriving irreducible buses.
src/AdjacencyMatrix.jl	Passes the reduction setting into the helper.
src/degree_two_reduction.jl	Documents the reactive-only injector behavior.
test/test_degree_two_reactive_injectors.jl	Adds targeted tests for reactive-only degree-2 reduction behavior.

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Performance Results

Precompile Time

Main	This Branch	Delta
2.338 s	2.301 s	-1.6%

Execution Time

Test	Main	This Branch	Delta
matpower_ACTIVSg2000_sys-Build PTDF First	1.926 s	2.623 s	+36.2%
matpower_ACTIVSg2000_sys-Build PTDF Second	542.9 ms	78.7 ms	-85.5%
matpower_ACTIVSg2000_sys-Build Ybus First	12.9 ms	12.5 ms	-2.8%
matpower_ACTIVSg2000_sys-Build Ybus Second	11.1 ms	11.6 ms	+5.1%
matpower_ACTIVSg2000_sys-Build LODF First	145.4 ms	161.3 ms	+11.0%
matpower_ACTIVSg2000_sys-Build LODF Second	144.3 ms	154.2 ms	+6.9%
matpower_ACTIVSg2000_sys-Build VirtualMODF First	2.183 s	4.129 s	+89.1%
matpower_ACTIVSg2000_sys-Build VirtualMODF Second	102.9 ms	1.076 s	+945.3%
matpower_ACTIVSg2000_sys-VirtualMODF Query 10 rows	515.8 ms	505.6 ms	-2.0%
matpower_ACTIVSg2000_sys-Radial network reduction First	537.9 ms	562.4 ms	+4.6%
matpower_ACTIVSg2000_sys-Radial network reduction Second	0.7 ms	0.7 ms	-0.4%
matpower_ACTIVSg2000_sys-Degree two network reduction First	1.833 s	N/A	N/A
matpower_ACTIVSg2000_sys-Degree two network reduction Second	1.3 ms	N/A	N/A
Base_Eastern_Interconnect_515GW-Build Ybus First	918.9 ms	778.8 ms	-15.2%
Base_Eastern_Interconnect_515GW-Build Ybus Second	975.1 ms	646.6 ms	-33.7%
Base_Eastern_Interconnect_515GW-Radial network reduction First	39.6 ms	36.3 ms	-8.4%
Base_Eastern_Interconnect_515GW-Radial network reduction Second	1.449 s	36.0 ms	-97.5%
Base_Eastern_Interconnect_515GW-Degree two network reduction First	376.0 ms	N/A	N/A
Base_Eastern_Interconnect_515GW-Degree two network reduction Second	50.1 ms	N/A	N/A
matpower_ACTIVSg2000_sys-Degree two network reduction	N/A	FAILED	N/A
Base_Eastern_Interconnect_515GW-Degree two network reduction	N/A	FAILED	N/A