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add PST constraints for DCPPowerModels #874

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add PST constraints for DCPPowerModels #874

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19 changes: 19 additions & 0 deletions src/form/dcp.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,25 @@ function expression_branch_power_ohms_yt_to(pm::AbstractDCPModel, n::Int, f_bus,
# omit reactive constraint
end

function constraint_ohms_y_oltc_pst_from(pm::AbstractDCPModel, n::Int, f_bus, t_bus, f_idx, t_idx, g, b, g_fr, b_fr)
p_fr = var(pm, n, :p, f_idx)
va_fr = var(pm, n, :va, f_bus)
va_to = var(pm, n, :va, t_bus)
ta = var(pm, n, :ta, f_idx[1])

JuMP.@constraint(pm.model, p_fr == -b*(va_fr - va_to - ta))
end

function constraint_ohms_y_oltc_pst_to(pm::AbstractDCPModel, n::Int, f_bus, t_bus, f_idx, t_idx, g, b, g_to, b_to)
p_to = var(pm, n, :p, t_idx)
va_fr = var(pm, n, :va, f_bus)
va_to = var(pm, n, :va, t_bus)
ta = var(pm, n, :ta, f_idx[1])

JuMP.@constraint(pm.model, p_to == -b*(va_to - va_fr + ta))
end


function constraint_ne_ohms_yt_from(pm::AbstractDCPModel, n::Int, i, f_bus, t_bus, f_idx, t_idx, g, b, g_fr, b_fr, tr, ti, tm, vad_min, vad_max)
p_fr = var(pm, n, :p_ne, f_idx)
va_fr = var(pm, n, :va, f_bus)
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44 changes: 44 additions & 0 deletions test/opf-var.jl
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Expand Up @@ -941,4 +941,48 @@ end
@test isapprox(result["solution"]["branch"]["3"]["ta"], 5.0/180*pi; atol = 1e-1)
end
end

@testset "test dc polar opf" begin
@testset "3-bus case with fixed phase shift / tap" begin
file = "../test/data/matpower/case3_oltc_pst.m"
data = PowerModels.parse_file(file)
result = PowerModels.run_opf(data, DCPPowerModel, milp_solver)

@test result["termination_status"] == OPTIMAL
@test isapprox(result["objective"], 5782.0; atol = 1e0)
end

@testset "3-bus case with optimal phase shifting / tap changing" begin
file = "../test/data/matpower/case3_oltc_pst.m"
data = PowerModels.parse_file(file)
result = PowerModels._solve_opf_oltc_pst(data, DCPPowerModel, milp_solver)

@test result["termination_status"] == OPTIMAL
@test isapprox(result["objective"], 5639.0; atol = 1e0)

@test haskey(result["solution"]["branch"]["1"], "ta")

@test isapprox(result["solution"]["branch"]["1"]["ta"], 0.000; atol = 1e-3)
@test isapprox(result["solution"]["branch"]["2"]["ta"], 0.000; atol = 1e-3)
@test isapprox(result["solution"]["branch"]["3"]["ta"], 15.0/180*pi; atol = 1e-1)
end


@testset "3-bus case with optimal phase shifting / tap changing with equal lb/ub" begin
file = "../test/data/matpower/case3_oltc_pst.m"
data = PowerModels.parse_file(file)
for (i, branch) in data["branch"]
branch["ta_min"] = branch["shift"]
branch["ta_max"] = branch["shift"]
end
result = PowerModels._solve_opf_oltc_pst(data, DCPPowerModel, milp_solver)

@test result["termination_status"] == OPTIMAL
@test isapprox(result["objective"], 5698.1; atol = 1e0)

@test isapprox(result["solution"]["branch"]["1"]["ta"], 0.000; atol = 1e-3)
@test isapprox(result["solution"]["branch"]["2"]["ta"], 0.000; atol = 1e-3)
@test isapprox(result["solution"]["branch"]["3"]["ta"], 5.0/180*pi; atol = 1e-1)
end
end
end