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fix: per-unitize VSC converter BLOSS on the DC base kV #52

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Merged
jd-lara merged 1 commit into from
Sep 5, 2026
Merged

fix: per-unitize VSC converter BLOSS on the DC base kV #52

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9 changes: 6 additions & 3 deletions src/pm_io/psse.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2135,13 +2135,16 @@ function _psse2pm_dcline!(pm_data::Dict, pti_data::Dict, import_all::Bool)
sub_data["ac_setpoint_from"] = from_bus["ACSET"]
sub_data["ac_setpoint_to"] = to_bus["ACSET"]

# ALOSS, MINLOSS in kW, and BLOSS in kW/A. Divide by a 1000 to transform into MW, and divide by baseMVA to normalize to per-unit.
# ALOSS and MINLOSS are constant losses in kW: /1000 -> MW, /baseMVA -> p.u.
# BLOSS is kW per DC ampere, so its p.u. slope is per p.u. current, not per
# p.u. power: P_loss[MW] = BLOSS * I_A / 1000 with
# I_A = I_pu * 1000 * baseMVA / base_kV, giving P_loss[p.u.] = (BLOSS / base_kV) * I_pu.
sub_data["converter_loss_from"] = LinearCurve(
from_bus["BLOSS"] / (1000.0 * baseMVA),
from_bus["BLOSS"] / base_voltage,
(from_bus["ALOSS"] + from_bus["MINLOSS"]) / (1000.0 * baseMVA),
)
sub_data["converter_loss_to"] = LinearCurve(
to_bus["BLOSS"] / (1000.0 * baseMVA),
to_bus["BLOSS"] / base_voltage,
(to_bus["ALOSS"] + to_bus["MINLOSS"]) / (1000.0 * baseMVA),
)

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19 changes: 19 additions & 0 deletions test/test_parse_psse.jl
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Expand Up @@ -109,6 +109,25 @@ end
@test vscline["rated_dc_voltage"] == 150.0
end

@testset "PSSE VSC converter loss: BLOSS is per-unitized on the DC base kV" begin
# BLOSS is kW per DC ampere, so its LinearCurve slope is p.u. power per p.u. current:
# BLOSS / base_kV, not BLOSS / (1000 * baseMVA), which is not even dimensionless.
# ALOSS/MINLOSS are plain kW and do divide by 1000 * baseMVA. Port of
# PowerSystems.jl 11562cc4b.
file = joinpath(@__DIR__, "fixtures", "synthetic_v35_vsc_line.raw")
pm_data = PowerModelsData(file).data
vscline = only(values(pm_data["vscline"]))

# Both converters carry ALOSS = 1000.0 kW, BLOSS = 1.5 kW/A, MINLOSS = 0.0, on a
# 150 kV DC base (the TYPE 1 terminal's DCSET) and baseMVA = 100.0.
@test vscline["rated_dc_voltage"] == 150.0
for side in ("converter_loss_from", "converter_loss_to")
curve = vscline[side]
@test IS.get_proportional_term(curve) ≈ 1.5 / 150.0
@test IS.get_constant_term(curve) ≈ 1000.0 / (1000.0 * 100.0)
end
end

@testset "PSSE ISW area-slack flag" begin
file = joinpath(@__DIR__, "fixtures", "v35_area_slack_variants.raw")
pm_data = @test_logs(
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