def _pd2ppc_zero(net):
"""
Builds the ppc data structure for zero impedance system. Includes the impedance values of
lines and transformers, but no load or generation data.
For short-circuit calculation, the short-circuit impedance of external grids is also considered.
"""
# select elements in service (time consuming, so we do it once)
net["_is_elements"] = aux._select_is_elements_numba(net)
ppc = _init_ppc(net)
# init empty ppci
ppci = copy.deepcopy(ppc)
_build_bus_ppc(net, ppc)
_build_gen_ppc(net, ppc)
_add_ext_grid_sc_impedance_zero(net, ppc)
_build_branch_ppc_zero(net, ppc)
# adds auxilary buses for open switches at branches
_switch_branches(net, ppc)
# add auxilary buses for out of service buses at in service lines.
# Also sets lines out of service if they are connected to two out of service buses
_branches_with_oos_buses(net, ppc)
if hasattr(net, "_isolated_buses"):
ppc["bus"][net._isolated_buses, 1] = 4.
# generates "internal" ppci format (for powerflow calc) from "external" ppc format and updates the bus lookup
# Note: Also reorders buses and gens in ppc
ppci = _ppc2ppci(ppc, ppci, net)
net._ppc0 = ppc
return ppc, ppci
def get_nx_ppc(net):
_init_nx_options(net)
ppc = _init_ppc(net)
_build_bus_ppc(net, ppc)
return ppc
