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Fix OPF exceptions on PWL costs #100

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Fix OPF exceptions on PWL costs #100

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5e68ba1
Merge pull request #1 from rwl/fix-issue-95
dchassin Nov 17, 2025
5c28ed7
Refactor condition check for qcost array
dchassin Mar 19, 2026
c6453be
Prevent calculation on empty ipol in cost function
dchassin Mar 19, 2026
6c2c1c0
Correct d2f_dPg2 assignment logic
dchassin Mar 19, 2026
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3 changes: 2 additions & 1 deletion pypower/opf_costfcn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -102,7 +102,8 @@ def opf_costfcn(x, om, return_hessian=False):

## polynomial cost of P and Q
df_dPgQg = zeros(2 * ng) ## w.r.t p.u. Pg and Qg
df_dPgQg[ipol] = baseMVA * polycost(gencost[ipol, :], xx[ipol], 1)
if len(ipol):
df_dPgQg[ipol] = baseMVA * polycost(gencost[ipol, :], xx[ipol], 1)
df = zeros(nxyz)
df[iPg] = df_dPgQg[:ng]
df[iQg] = df_dPgQg[ng:ng + ng]
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5 changes: 3 additions & 2 deletions pypower/opf_hessfcn.py
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Expand Up @@ -101,9 +101,10 @@ def opf_hessfcn(x, lmbda, om, Ybus, Yf, Yt, ppopt, il=None, cost_mult=1.0):
d2f_dPg2 = zeros(ng)#sparse((ng, 1)) ## w.r.t. p.u. Pg
d2f_dQg2 = zeros(ng)#sparse((ng, 1)) ## w.r.t. p.u. Qg
ipolp = find(pcost[:, MODEL] == POLYNOMIAL)
d2f_dPg2[ipolp] = \
if len(ipol):
d2f_dPg2[ipolp] = \
baseMVA**2 * polycost(pcost[ipolp, :], Pg[ipolp] * baseMVA, 2)
if any(qcost): ## Qg is not free
if qcost.any(): ## Qg is not free
ipolq = find(qcost[:, MODEL] == POLYNOMIAL)
d2f_dQg2[ipolq] = \
baseMVA**2 * polycost(qcost[ipolq, :], Qg[ipolq] * baseMVA, 2)
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