def _calc_ybus(ppc):
Ybus, Yf, Yt = makeYbus(ppc["baseMVA"], ppc["bus"], ppc["branch"])
if np.isnan(Ybus.data).any():
raise ValueError("nan value detected in Ybus matrix - check calculation parameters for nan values")
ppc["internal"]["Yf"] = Yf
ppc["internal"]["Yt"] = Yt
ppc["internal"]["Ybus"] = Ybus
def _get_Y_bus(ppci, recycle, makeYbus, baseMVA, bus, branch):
if recycle is not None and not recycle["trafo"] and ppci["internal"]["Ybus"].size:
Ybus, Yf, Yt = ppci["internal"]['Ybus'], ppci["internal"]['Yf'], ppci["internal"]['Yt']
else:
## build admittance matrices
Ybus, Yf, Yt = makeYbus(baseMVA, bus, branch)
ppci["internal"]['Ybus'], ppci["internal"]['Yf'], ppci["internal"]['Yt'] = Ybus, Yf, Yt
return ppci, Ybus, Yf, Yt