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build_bus.py
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build_bus.py
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# -*- coding: utf-8 -*-
# Copyright (c) 2016-2024 by University of Kassel and Fraunhofer Institute for Energy Economics
# and Energy System Technology (IEE), Kassel. All rights reserved.
from collections import defaultdict
from itertools import chain
import numpy as np
import pandas as pd
from pandapower.auxiliary import _sum_by_group, phase_to_sequence, version_check
from pandapower.pypower.idx_bus import BUS_I, BASE_KV, PD, QD, GS, BS, VMAX, VMIN, BUS_TYPE, NONE, \
VM, VA, CID, CZD, bus_cols, REF, PV
from pandapower.pypower.idx_bus_sc import C_MAX, C_MIN, bus_cols_sc
from .pypower.idx_bus_dc import dc_bus_cols, DC_BUS_TYPE, DC_BUS_AREA, DC_VM, DC_ZONE, DC_VMAX, DC_VMIN, DC_P, DC_BUS_I, \
DC_BASE_KV, DC_NONE, DC_REF, DC_B2B, DC_PD
from .pypower.idx_ssc import ssc_cols, SSC_BUS, SSC_R, SSC_X, SSC_SET_VM_PU, SSC_X_CONTROL_VA, SSC_X_CONTROL_VM, \
SSC_STATUS, SSC_CONTROLLABLE, SSC_INTERNAL_BUS
from .pypower.idx_svc import svc_cols, SVC_BUS, SVC_SET_VM_PU, SVC_MIN_FIRING_ANGLE, SVC_MAX_FIRING_ANGLE, SVC_STATUS, \
SVC_CONTROLLABLE, SVC_X_L, SVC_X_CVAR, SVC_THYRISTOR_FIRING_ANGLE
from .pypower.idx_vsc import vsc_cols, VSC_BUS, VSC_INTERNAL_BUS, VSC_R, VSC_X, VSC_STATUS, VSC_CONTROLLABLE, \
VSC_BUS_DC, VSC_MODE_AC, VSC_VALUE_AC, VSC_MODE_DC, VSC_VALUE_DC, VSC_MODE_AC_V, VSC_MODE_AC_Q, VSC_MODE_AC_SL, \
VSC_MODE_DC_V, VSC_MODE_DC_P, VSC_INTERNAL_BUS_DC, VSC_R_DC, VSC_PL_DC
try:
from numba import jit
version_check('numba')
except ImportError:
from .pf.no_numba import jit
@jit(nopython=True, cache=False)
def ds_find(ar, bus): # pragma: no cover
while True:
p = ar[bus]
if p == bus:
break
bus = p
return p
@jit(nopython=True, cache=False)
def ds_union(ar, bus1, bus2, bus_is_pv): # pragma: no cover
root1 = ds_find(ar, bus1)
root2 = ds_find(ar, bus2)
if root1 == root2:
return
if bus_is_pv[root2]:
ar[root1] = root2
else:
ar[root2] = root1
@jit(nopython=True, cache=False)
def ds_create(ar, switch_bus, switch_elm, switch_et_bus, switch_closed, switch_z_ohm,
bus_is_pv, bus_in_service): # pragma: no cover
for i in range(len(switch_bus)):
if not switch_closed[i] or not switch_et_bus[i] or switch_z_ohm[i] > 0:
continue
bus1 = switch_bus[i]
bus2 = switch_elm[i]
if bus_in_service[bus1] and bus_in_service[bus2]:
ds_union(ar, bus1, bus2, bus_is_pv)
@jit(nopython=True, cache=False)
def fill_bus_lookup(ar, bus_lookup, bus_index):
for i in range(len(bus_index)):
bus_lookup[bus_index[i]] = i
for b in bus_index:
ds = ds_find(ar, b)
bus_lookup[b] = bus_lookup[ar[ds]]
def create_bus_lookup_numba(net, bus_index, bus_is_idx, gen_is_mask, eg_is_mask):
max_bus_idx = np.max(bus_index)
# extract numpy arrays of switch table data
switch = net["switch"]
switch_bus = switch["bus"].values
switch_elm = switch["element"].values
switch_et_bus = switch["et"].values == "b"
switch_closed = switch["closed"].values
switch_z_ohm = switch['z_ohm'].values
# create array for fast checking if a bus is in_service
bus_in_service = np.zeros(max_bus_idx + 1, dtype=bool)
bus_in_service[bus_is_idx] = True
# create array for fast checking if a bus is pv bus
bus_is_pv = np.zeros(max_bus_idx + 1, dtype=bool)
bus_is_pv[net["ext_grid"]["bus"].values[eg_is_mask]] = True
bus_is_pv[net["gen"]["bus"].values[gen_is_mask]] = True
# create array that represents the disjoint set
ar = np.arange(max_bus_idx + 1)
ds_create(ar, switch_bus, switch_elm, switch_et_bus, switch_closed, switch_z_ohm, bus_is_pv,
bus_in_service)
# finally create and fill bus lookup
bus_lookup = -np.ones(max_bus_idx + 1, dtype=np.int64)
fill_bus_lookup(ar, bus_lookup, bus_index)
return bus_lookup
class DisjointSet(dict):
def add(self, item):
self[item] = item
def find(self, item):
parent = self[item]
if self[parent] != parent:
parent = self.find(parent)
self[item] = parent
return parent
def union(self, item1, item2):
p1 = self.find(item1)
p2 = self.find(item2)
self[p1] = p2
def create_consecutive_bus_lookup(net, bus_index):
# create a mapping from arbitrary pp-index to a consecutive index starting at zero (ppc-index)
if len(bus_index) == 0:
return np.array([], dtype=np.int64)
consec_buses = np.arange(len(bus_index), dtype=np.int64)
# bus_lookup as dict:
# bus_lookup = dict(zip(bus_index, consec_buses))
# bus lookup as mask from pandapower -> pypower
bus_lookup = -np.ones(max(bus_index) + 1, dtype=np.int64)
bus_lookup[bus_index] = consec_buses
return bus_lookup
def create_bus_lookup_numpy(net, bus_index, bus_is_idx, gen_is_mask, eg_is_mask,
closed_bb_switch_mask):
bus_lookup = create_consecutive_bus_lookup(net, bus_index)
net._fused_bb_switches = closed_bb_switch_mask & (net["switch"]["z_ohm"].values <= 0)
if net._fused_bb_switches.any():
# Note: this might seem a little odd - first constructing a pp to ppc mapping without
# fused busses and then update the entries. The alternative (to construct the final
# mapping at once) would require to determine how to fuse busses and which busses
# are not part of any opened bus-bus switches first. It turns out, that the latter takes
# quite some time in the average usecase, where #busses >> #bus-bus switches.
# Find PV / Slack nodes -> their bus must be kept when fused with a PQ node
pv_list = [net["ext_grid"]["bus"].values[eg_is_mask], net["gen"]["bus"].values[gen_is_mask]]
pv_ref = np.unique(np.hstack(pv_list))
# get the pp-indices of the buses which are connected to a switch to be fused
fbus = net["switch"]["bus"].values[net._fused_bb_switches]
tbus = net["switch"]["element"].values[net._fused_bb_switches]
# create a mapping to map each bus to itself at frist ...
ds = DisjointSet({e: e for e in chain(fbus, tbus)})
# ... to follow each bus along a possible chain of switches to its final bus and update the
# map
for f, t in zip(fbus, tbus):
ds.union(f, t)
# now we can find out how to fuse each bus by looking up the final bus of the chain they
# are connected to
v = defaultdict(set)
for a in ds:
v[ds.find(a)].add(a)
# build sets of buses which will be fused
disjoint_sets = [e for e in v.values() if len(e) > 1]
# check if PV buses need to be fused
# if yes: the sets with PV buses must be found (which is slow)
# if no: the check can be omitted
if any(i in fbus or i in tbus for i in pv_ref):
# for every disjoint set
for dj in disjoint_sets:
# check if pv buses are in the disjoint set dj
pv_buses_in_set = set(pv_ref) & dj
nr_pv_bus = len(pv_buses_in_set)
if nr_pv_bus == 0:
# no pv buses. Use any bus in dj
map_to = bus_lookup[dj.pop()]
else:
# one pv bus. Get bus from pv_buses_in_set
map_to = bus_lookup[pv_buses_in_set.pop()]
for bus in dj:
# update lookup
bus_lookup[bus] = map_to
else:
# no PV buses in set
for dj in disjoint_sets:
# use any bus in set
map_to = bus_lookup[dj.pop()]
for bus in dj:
# update bus lookup
bus_lookup[bus] = map_to
return bus_lookup
def create_bus_lookup(net, bus_index, bus_is_idx, gen_is_mask, eg_is_mask, numba):
switches_with_pos_z_ohm = net["switch"]["z_ohm"].values > 0
if switches_with_pos_z_ohm.any() or not numba:
# if there are any closed bus-bus switches find them
closed_bb_switch_mask = (net["switch"]["closed"].values &
(net["switch"]["et"].values == "b") &
np.isin(net["switch"]["bus"].values, bus_is_idx) &
np.isin(net["switch"]["element"].values, bus_is_idx))
if switches_with_pos_z_ohm.any():
net._impedance_bb_switches = closed_bb_switch_mask & switches_with_pos_z_ohm
else:
net._impedance_bb_switches = np.zeros(switches_with_pos_z_ohm.shape)
if numba:
bus_lookup = create_bus_lookup_numba(net, bus_index, bus_is_idx,
gen_is_mask, eg_is_mask)
else:
bus_lookup = create_bus_lookup_numpy(net, bus_index, bus_is_idx,
gen_is_mask, eg_is_mask, closed_bb_switch_mask)
return bus_lookup
def get_voltage_init_vector(net, init_v, mode, sequence=None):
if isinstance(init_v, str):
if init_v == "results":
res_table = "res_bus" if sequence is None else "res_bus_3ph"
# init voltage possible if bus results are available
if res_table not in net or not net[res_table].index.equals(net.bus.index):
# cannot init from results, since sorting of results is different from element table
# TO BE REVIEWED! Why there was no raise before this commit?
raise UserWarning("Init from results not possible. Index of %s do not match with "
"bus. You should sort res_bus before calling runpp." % res_table)
if res_table == "res_bus_3ph":
vm = net.res_bus_3ph[["vm_a_pu", "vm_b_pu", "vm_c_pu"]].values.T
va = net.res_bus_3ph[["va_a_degree", "va_b_degree", "va_c_degree"]].values.T
voltage_vector = phase_to_sequence(vm * np.exp(1j * np.pi * va / 180.))[sequence, :]
if mode == "magnitude":
return np.abs(voltage_vector)
elif mode == "angle":
return np.angle(voltage_vector) * 180 / np.pi
else:
raise UserWarning(str(mode)+" for initialization not available!")
else:
if mode == "magnitude":
return net[res_table]["vm_pu"].values.copy()
elif mode == "angle":
return net[res_table]["va_degree"].values.copy()
else:
raise UserWarning(str(mode)+" for initialization not available!")
if init_v == "flat":
return None
elif isinstance(init_v, (float, np.ndarray, list)) and sequence is None or sequence == 1:
return init_v
elif isinstance(init_v, pd.Series) and sequence is None or sequence == 1:
if init_v.index.equals(net.bus.index):
return init_v.loc[net.bus.index]
else:
raise UserWarning("Voltage starting vector indices do not match bus indices")
def _build_bus_ppc(net, ppc, sequence=None):
"""
Generates the ppc["bus"] array and the lookup pandapower indices -> ppc indices
"""
init_vm_pu = net["_options"]["init_vm_pu"]
init_va_degree = net["_options"]["init_va_degree"]
mode = net["_options"]["mode"]
numba = net["_options"]["numba"] if "numba" in net["_options"] else False
# get bus indices
nr_xward = len(net.xward)
nr_trafo3w = len(net.trafo3w)
nr_ssc = len(net.ssc)
nr_vsc = len(net.vsc)
aux = dict()
if nr_xward > 0 or nr_trafo3w > 0 or nr_ssc > 0 or nr_vsc > 0:
bus_indices = [net["bus"].index.values, np.array([], dtype=np.int64)]
max_idx = max(net["bus"].index) + 1
if nr_xward > 0:
aux_xward = np.arange(max_idx, max_idx + nr_xward, dtype=np.int64)
aux["xward"] = aux_xward
bus_indices.append(aux_xward)
if nr_trafo3w:
aux_trafo3w = np.arange(max_idx + nr_xward, max_idx + nr_xward + nr_trafo3w)
aux["trafo3w"] = aux_trafo3w
bus_indices.append(aux_trafo3w)
if nr_ssc:
aux_ssc = np.arange(max_idx + nr_xward + nr_trafo3w, max_idx + nr_xward + nr_trafo3w + nr_ssc)
aux["ssc"] = aux_ssc
bus_indices.append(aux_ssc)
if nr_vsc:
aux_vsc = np.arange(max_idx + nr_xward + nr_trafo3w + nr_ssc, max_idx + nr_xward + nr_trafo3w + nr_ssc + nr_vsc)
aux["vsc"] = aux_vsc
bus_indices.append(aux_vsc)
bus_index = np.concatenate(bus_indices)
else:
bus_index = net["bus"].index.values
# get in service elements
if mode == "nx":
bus_lookup = create_consecutive_bus_lookup(net, bus_index)
else:
_is_elements = net["_is_elements"]
eg_is_mask = _is_elements['ext_grid']
gen_is_mask = _is_elements['gen']
bus_is_idx = _is_elements['bus_is_idx']
bus_lookup = create_bus_lookup(net, bus_index, bus_is_idx,
gen_is_mask, eg_is_mask, numba=numba)
n_bus_ppc = len(bus_index)
# init ppc with empty values
ppc["bus"] = np.zeros(shape=(n_bus_ppc, bus_cols), dtype=np.float64)
ppc["bus"][:, :15] = np.array([0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 2, 0, 0., 0.]) # changes of
# voltage limits (2 and 0) must be considered in check_opf_data
if sequence is not None and sequence != 1:
ppc["bus"][:, VM] = 0.
if mode == "sc":
bus_sc = np.empty(shape=(n_bus_ppc, bus_cols_sc), dtype=np.float64)
bus_sc.fill(np.nan)
ppc["bus"] = np.hstack((ppc["bus"], bus_sc))
# apply consecutive bus numbers
ppc["bus"][:, BUS_I] = np.arange(n_bus_ppc)
n_bus = len(net.bus.index)
# init voltages from net
ppc["bus"][:n_bus, BASE_KV] = net["bus"]["vn_kv"].values
# set buses out of service (BUS_TYPE == 4)
if nr_xward > 0 or nr_trafo3w > 0 or nr_ssc > 0 or nr_vsc > 0:
in_service = np.concatenate([net["bus"]["in_service"].values,
net["xward"]["in_service"].values,
net["trafo3w"]["in_service"].values,
net["ssc"]["in_service"].values,
net["vsc"]["in_service"].values])
else:
in_service = net["bus"]["in_service"].values
ppc["bus"][~in_service, BUS_TYPE] = NONE
if mode != "nx":
set_reference_buses(net, ppc, bus_lookup, mode)
vm_pu = get_voltage_init_vector(net, init_vm_pu, "magnitude", sequence=sequence)
if vm_pu is not None:
ppc["bus"][:n_bus, VM] = vm_pu
va_degree = get_voltage_init_vector(net, init_va_degree, "angle", sequence=sequence)
if va_degree is not None:
ppc["bus"][:n_bus, VA] = va_degree
if mode == "sc":
_add_c_to_ppc(net, ppc)
if net._options["mode"] == "opf":
if "max_vm_pu" in net.bus:
ppc["bus"][:n_bus, VMAX] = net["bus"].max_vm_pu.values
else:
ppc["bus"][:n_bus, VMAX] = 2. # changes of VMAX must be considered in check_opf_data
if "min_vm_pu" in net.bus:
ppc["bus"][:n_bus, VMIN] = net["bus"].min_vm_pu.values
else:
ppc["bus"][:n_bus, VMIN] = 0. # changes of VMIN must be considered in check_opf_data
if len(net.xward):
_fill_auxiliary_buses(net, ppc, bus_lookup, "xward", "bus", aux)
if len(net.trafo3w):
_fill_auxiliary_buses(net, ppc, bus_lookup, "trafo3w", "hv_bus", aux)
if len(net.ssc):
_fill_auxiliary_buses(net, ppc, bus_lookup, "ssc", "bus", aux)
if len(net.vsc):
_fill_auxiliary_buses(net, ppc, bus_lookup, "vsc", "bus", aux)
net["_pd2ppc_lookups"]["bus"] = bus_lookup
net["_pd2ppc_lookups"]["aux"] = aux
def _build_bus_dc_ppc(net, ppc):
"""
Generates the ppc["bus_dc"] array and the lookup pandapower indices -> ppc indices
"""
init_vm_pu = net["_options"]["init_vm_pu"]
mode = net["_options"]["mode"]
numba = net["_options"]["numba"] if "numba" in net["_options"] else False
# get bus indices
bus_index = net["bus_dc"].index.values
# get in service elements
aux = dict()
nr_vsc = len(net.vsc)
if nr_vsc > 0:
max_idx = max(net["bus_dc"].index) + 1
aux_vsc = np.arange(max_idx, max_idx + nr_vsc)
aux["vsc"] = aux_vsc
bus_index = np.concatenate([bus_index, aux_vsc])
bus_lookup = create_consecutive_bus_lookup(net, bus_index)
# todo if dc switches are added, adjust this part to implement @fuse buses@ for bus_dc:
#if mode == "nx":
# bus_lookup = create_consecutive_bus_lookup(net, bus_index)
#else:
# _is_elements = net["_is_elements"]
#eg_is_mask = _is_elements['ext_grid']
#gen_is_mask = _is_elements['gen']
#bus_is_idx = _is_elements['bus_dc_is_idx']
#bus_lookup = create_bus_lookup(net, bus_index, bus_is_idx,
# gen_is_mask, eg_is_mask, numba=numba)
n_bus_ppc = len(bus_index)
# init ppc with empty values
ppc["bus_dc"] = np.zeros(shape=(n_bus_ppc, dc_bus_cols), dtype=np.float64)
# changes of voltage limits (2 and 0) must be considered in check_opf_data
ppc["bus_dc"][:, [DC_BUS_TYPE, DC_BUS_AREA, DC_VM, DC_ZONE, DC_VMAX, DC_VMIN]] = np.array([DC_P, 1, 1, 1, 2, 0], dtype=np.int64)
# if mode == "sc":
# bus_sc = np.empty(shape=(n_bus_ppc, bus_cols_sc), dtype=np.float64)
# bus_sc.fill(np.nan)
# ppc["bus"] = np.hstack((ppc["bus"], bus_sc))
# apply consecutive bus numbers
ppc["bus_dc"][:, DC_BUS_I] = np.arange(n_bus_ppc)
n_bus_dc = len(net.bus_dc.index)
# init voltages from net
ppc["bus_dc"][:n_bus_dc, DC_BASE_KV] = net["bus_dc"]["vn_kv"].values
# set buses out of service (BUS_TYPE == 4)
if nr_vsc > 0:
in_service = np.concatenate([net["bus_dc"]["in_service"].values,
net["vsc"]["in_service"].values])
else:
in_service = net["bus_dc"]["in_service"].values
ppc["bus_dc"][~in_service, DC_BUS_TYPE] = DC_NONE
# todo: add init vm_pu for DC buses eventually
#vm_pu = get_voltage_init_vector(net, init_vm_pu, "magnitude", sequence=sequence)
#if vm_pu is not None:
# ppc["bus"][:n_bus_dc, VM] = vm_pu
if net._options["mode"] == "opf":
if "max_vm_pu" in net.bus_dc:
ppc["bus_dc"][:n_bus_dc, DC_VMAX] = net["bus_dc"].max_vm_pu.values
else:
ppc["bus_dc"][:n_bus_dc, DC_VMAX] = 2. # changes of VMAX must be considered in check_opf_data
if "min_vm_pu" in net.bus_dc:
ppc["bus_dc"][:n_bus_dc, DC_VMIN] = net["bus_dc"].min_vm_pu.values
else:
ppc["bus_dc"][:n_bus_dc, DC_VMIN] = 0. # changes of VMIN must be considered in check_opf_data
if nr_vsc > 0:
_fill_auxiliary_buses(net, ppc, bus_lookup, "vsc", "bus_dc", aux, "bus_dc")
net["_pd2ppc_lookups"]["bus_dc"] = bus_lookup
net["_pd2ppc_lookups"]["aux_dc"] = aux
if mode != "nx":
set_reference_buses_dc(net, ppc, bus_lookup, mode)
def _fill_auxiliary_buses(net, ppc, bus_lookup, element, bus_column, aux, bus_table="bus"):
element_bus_idx = bus_lookup[net[element][bus_column].values]
aux_idx = bus_lookup[aux[element]]
if bus_table == "bus":
base_kv, vmin, vmax, vm = BASE_KV, VMIN, VMAX, VM
elif bus_table == "bus_dc":
base_kv, vmin, vmax, vm = DC_BASE_KV, DC_VMIN, DC_VMAX, DC_VM
else:
raise NotImplementedError(f"bus table {bus_table} not supported")
ppc[bus_table][aux_idx, base_kv] = ppc[bus_table][element_bus_idx, base_kv]
if net._options["mode"] == "opf":
ppc[bus_table][aux_idx, vmin] = ppc[bus_table][element_bus_idx, vmin]
ppc[bus_table][aux_idx, vmax] = ppc[bus_table][element_bus_idx, vmax]
if net._options["init_vm_pu"] == "results":
ppc[bus_table][aux_idx, vm] = net["res_%s" % element][
"vm_internal_pu" if bus_table == "bus" else "vm_internal_dc_pu"].values
else:
ppc[bus_table][aux_idx, vm] = ppc[bus_table][element_bus_idx, vm]
if net._options["init_va_degree"] == "results" and bus_table == "bus":
ppc[bus_table][aux_idx, VA] = net["res_%s" % element]["va_internal_degree"].values
elif bus_table == "bus":
ppc[bus_table][aux_idx, VA] = ppc[bus_table][element_bus_idx, VA]
def set_reference_buses(net, ppc, bus_lookup, mode):
if mode == "nx":
return
eg_buses = bus_lookup[net.ext_grid.bus.values[net._is_elements["ext_grid"]]]
ppc["bus"][eg_buses, BUS_TYPE] = REF
ppc["internal"]["ac_slack_buses"] = set(eg_buses) # needed later in _select_is_elements_numba
if mode == "sc":
gen_slacks = net._is_elements["gen"] # generators are slacks for short-circuit calculation
else:
gen_slacks = net._is_elements["gen"] & net.gen["slack"].values
if gen_slacks.any():
slack_buses = net.gen["bus"].values[gen_slacks]
ppc["bus"][bus_lookup[slack_buses], BUS_TYPE] = REF
ppc["internal"]["ac_slack_buses"] |= set(bus_lookup[slack_buses]) # needed later in _select_is_elements_numba
ppc["internal"]["ac_slack_buses"] = list(ppc["internal"]["ac_slack_buses"])
def set_reference_buses_dc(net, ppc, bus_lookup, mode):
if mode == "nx":
return
vsc_dc_slack = net.vsc.control_mode_dc.values == "vm_pu"
vsc_ac_slack = net.vsc.control_mode_ac.values == "slack" # VSC that defines AC slack cannot define DC slack
# todo vsc
# ref_buses = bus_lookup[net._pd2ppc_lookups["aux_dc"].get("vsc", np.array([], dtype=np.int64))[net._is_elements["vsc"] & vsc_dc_slack & ~vsc_ac_slack]]
ref_buses = bus_lookup[net.vsc.bus_dc.values[net._is_elements["vsc"] & vsc_dc_slack & ~vsc_ac_slack]]
ppc["bus_dc"][ref_buses, DC_BUS_TYPE] = DC_REF
# identify back-to-back converters:
vsc_dc_p = net.vsc.control_mode_dc.values == "p_mw"
p_buses = bus_lookup[net._pd2ppc_lookups["aux_dc"].get("vsc", np.array([], dtype=np.int64))[net._is_elements["vsc"] & vsc_dc_p]]
b2b_buses = np.intersect1d(ref_buses, p_buses)
ppc["bus_dc"][b2b_buses, DC_BUS_TYPE] = DC_B2B
def _calc_pq_elements_and_add_on_ppc(net, ppc, sequence=None):
# init values
b, p, q = np.array([], dtype=np.int64), np.array([]), np.array([])
_is_elements = net["_is_elements"]
voltage_depend_loads = net["_options"]["voltage_depend_loads"]
mode = net["_options"]["mode"]
pq_elements = ["load", "motor", "sgen", "storage", "ward", "xward"]
bus_lookup = net["_pd2ppc_lookups"]["bus"]
for element in pq_elements:
tab = net[element]
if len(tab) == 0:
continue
active = _is_elements[element].astype(np.float64)
if element == "load" and voltage_depend_loads:
if ((tab["const_z_percent"] + tab["const_i_percent"]) > 100).any():
raise ValueError("const_z_percent + const_i_percent need to "
"be less or equal to 100%!")
for bus in set(tab["bus"]):
mask = (tab["bus"] == bus) & active
no_loads = sum(mask)
if not no_loads:
continue
ci_sum = sum(tab["const_i_percent"][mask] / 100.)
ppc["bus"][bus_lookup[bus], CID] = ci_sum / no_loads
cz_sum = sum(tab["const_z_percent"][mask] / 100.)
ppc["bus"][bus_lookup[bus], CZD] = cz_sum / no_loads
sign = -1 if element == "sgen" else 1
if element == "motor":
p_mw, q_mvar = _get_motor_pq(net)
p = np.hstack([p, p_mw])
q = np.hstack([q, q_mvar])
elif element.endswith("ward"):
p = np.hstack([p, tab["ps_mw"].values * active * sign])
q = np.hstack([q, tab["qs_mvar"].values * active * sign])
else:
scaling = tab["scaling"].values
p = np.hstack([p, tab["p_mw"].values * active * scaling * sign])
q = np.hstack([q, tab["q_mvar"].values * active * scaling * sign])
b = np.hstack([b, tab["bus"].values])
for element in ["asymmetric_load", "asymmetric_sgen"]:
if len(net[element]) > 0 and mode == "pf":
p_mw, q_mvar = _get_symmetric_pq_of_unsymetric_element(net, element)
sign = -1 if element.endswith("sgen") else 1
p = np.hstack([p, p_mw * sign])
q = np.hstack([q, q_mvar * sign])
b = np.hstack([b, net[element]["bus"].values])
# sum up p & q of bus elements
if b.size > 0:
b = bus_lookup[b]
b, vp, vq = _sum_by_group(b, p, q)
ppc["bus"][b, PD] = vp
ppc["bus"][b, QD] = vq
# init values DC
b_dc, p_dc = np.array([], dtype=np.int64), np.array([], dtype=np.float64)
p_dc_elements = [] # todo add more DC elements like DC loads, DC sgens
# p_dc_elements = ["vsc"] # todo add more DC elements like DC loads, DC sgens
bus_dc_lookup = net["_pd2ppc_lookups"]["bus_dc"]
for element in p_dc_elements:
tab = net[element]
if len(tab) == 0:
continue
active = _is_elements[element].astype(np.float64)
scaling = tab["scaling"].values if "scaling" in tab.columns else 1.
sign = -1 if element == "sgen_dc" else 1 # todo add DC sgen etc.
if element == "vsc":
# old: we model pl_dc as shsunt resistor instead (here left for reference, can be deleted safely)
p_dc = np.hstack([p_dc, tab["pl_dc_mw"].values * active * scaling * sign])
# b_dc = np.hstack([b_dc, tab["bus_dc"].values])
b_dc = np.hstack([b_dc, net["_pd2ppc_lookups"]["aux_dc"]["vsc"]])
else:
p_dc = np.hstack([p_dc, tab["p_dc_mw"].values * active * scaling * sign])
b_dc = np.hstack([b_dc, tab["bus_dc"].values])
# sum up p_dc of bus_dc elements
if b_dc.size > 0:
b_dc = bus_dc_lookup[b_dc]
b_dc, vp_dc, _ = _sum_by_group(b_dc, p_dc, p_dc)
ppc["bus_dc"][b_dc, DC_PD] = vp_dc
def _get_symmetric_pq_of_unsymetric_element(net, element):
scale = net["_is_elements"][element] * net[element]["scaling"].values.T
q_mvar = np.sum(net[element][["q_a_mvar", "q_b_mvar", "q_c_mvar"]].values, axis=1)
p_mw = np.sum(net[element][["p_a_mw", "p_b_mw", "p_c_mw"]].values, axis=1)
return p_mw*scale, q_mvar*scale
def _get_motor_pq(net):
tab = net["motor"]
active = net._is_elements["motor"]
scale = tab["loading_percent"].values/100 * tab["scaling"].values*active
efficiency = tab["efficiency_percent"].values
p_mech = tab["pn_mech_mw"].values
cos_phi = tab["cos_phi"].values
p_mw = p_mech / efficiency * 100 * scale
s_mvar = p_mw / cos_phi
q_mvar = np.sqrt(s_mvar**2 - p_mw**2)
return p_mw, q_mvar
def _calc_shunts_and_add_on_ppc(net, ppc):
# init values
b, p, q = np.array([], dtype=np.int64), np.array([]), np.array([])
bus_lookup = net["_pd2ppc_lookups"]["bus"]
# Divide base kv by 3 for 3 phase calculation
mode = net._options["mode"]
base_multiplier = 1/3 if mode == "pf_3ph" else 1
# get in service elements
_is_elements = net["_is_elements"]
s = net["shunt"]
if len(s) > 0:
vl = _is_elements["shunt"]
v_ratio = (ppc["bus"][bus_lookup[s["bus"].values], BASE_KV] / s["vn_kv"].values) ** 2 * base_multiplier
q = np.hstack([q, s["q_mvar"].values * s["step"].values * v_ratio * vl])
p = np.hstack([p, s["p_mw"].values * s["step"].values * v_ratio * vl])
b = np.hstack([b, s["bus"].values])
w = net["ward"]
if len(w) > 0:
vl = _is_elements["ward"]
q = np.hstack([q, w["qz_mvar"].values * base_multiplier * vl])
p = np.hstack([p, w["pz_mw"].values * base_multiplier * vl])
b = np.hstack([b, w["bus"].values])
xw = net["xward"]
if len(xw) > 0:
vl = _is_elements["xward"]
q = np.hstack([q, xw["qz_mvar"].values * base_multiplier * vl])
p = np.hstack([p, xw["pz_mw"].values * base_multiplier * vl])
b = np.hstack([b, xw["bus"].values])
loss_location = net._options["trafo3w_losses"].lower()
trafo3w = net["trafo3w"]
if loss_location == "star" and len(trafo3w) > 0:
pfe_mw = trafo3w["pfe_kw"].values * 1e-3
i0 = trafo3w["i0_percent"].values
sn_mva = trafo3w["sn_hv_mva"].values
q_mvar = (sn_mva * i0 / 100.) ** 2 - pfe_mw ** 2
q_mvar[q_mvar < 0] = 0
q_mvar = np.sqrt(q_mvar)
vn_hv_trafo = trafo3w["vn_hv_kv"].values
vn_hv_bus = ppc["bus"][bus_lookup[trafo3w.hv_bus.values], BASE_KV]
v_ratio = (vn_hv_bus / vn_hv_trafo) ** 2 * base_multiplier
q = np.hstack([q, q_mvar * v_ratio])
p = np.hstack([p, pfe_mw * v_ratio])
b = np.hstack([b, net._pd2ppc_lookups["aux"]["trafo3w"]])
# if array is not empty
if b.size:
b = bus_lookup[b]
b, vp, vq = _sum_by_group(b, p, q)
ppc["bus"][b, GS] = vp
ppc["bus"][b, BS] = -vq
def _build_svc_ppc(net, ppc, mode):
length = len(net.svc)
ppc["svc"] = np.zeros(shape=(length, svc_cols), dtype=np.float64)
if mode != "pf":
return
if length > 0:
baseMVA = ppc["baseMVA"]
bus_lookup = net["_pd2ppc_lookups"]["bus"]
f = 0
t = length
bus = bus_lookup[net.svc["bus"].values]
svc = ppc["svc"]
baseV = ppc["bus"][bus, BASE_KV]
baseZ = baseV ** 2 / baseMVA
svc[f:t, SVC_BUS] = bus
svc[f:t, SVC_X_L] = net["svc"]["x_l_ohm"].values / baseZ
svc[f:t, SVC_X_CVAR] = net["svc"]["x_cvar_ohm"].values / baseZ
svc[f:t, SVC_SET_VM_PU] = net["svc"]["set_vm_pu"].values
svc[f:t, SVC_THYRISTOR_FIRING_ANGLE] = np.deg2rad(net["svc"]["thyristor_firing_angle_degree"].values)
svc[f:t, SVC_MIN_FIRING_ANGLE] = np.deg2rad(net["svc"]["min_angle_degree"].values)
svc[f:t, SVC_MAX_FIRING_ANGLE] = np.deg2rad(net["svc"]["max_angle_degree"].values)
svc[f:t, SVC_STATUS] = net["svc"]["in_service"].values
svc[f:t, SVC_CONTROLLABLE] = net["svc"]["controllable"].values.astype(bool) & net["svc"][
"in_service"].values.astype(bool)
def _build_ssc_ppc(net, ppc, mode):
length = len(net.ssc)
ppc["ssc"] = np.zeros(shape=(length, ssc_cols), dtype=np.float64)
if mode != "pf":
return
if length > 0:
baseMVA = ppc["baseMVA"]
bus_lookup = net["_pd2ppc_lookups"]["bus"]
aux = net["_pd2ppc_lookups"]["aux"]
f = 0
t = length
bus = bus_lookup[net.ssc["bus"].values]
controllable = net["ssc"]["controllable"].values.astype(bool)
ssc = ppc["ssc"]
baseV = ppc["bus"][bus, BASE_KV]
baseZ = baseV ** 2 / baseMVA
ssc[f:t, SSC_BUS] = bus
ssc[f:t, SSC_INTERNAL_BUS] = bus_lookup[aux["ssc"]]
ssc[f:t, SSC_R] = net["ssc"]["r_ohm"].values / baseZ
ssc[f:t, SSC_X] = net["ssc"]["x_ohm"].values / baseZ
ssc[f:t, SSC_SET_VM_PU] = net["ssc"]["set_vm_pu"].values
ssc[f:t, SSC_X_CONTROL_VA] = np.deg2rad(net["ssc"]["va_internal_degree"].values)
ssc[f:t, SSC_X_CONTROL_VM] = net["ssc"]["vm_internal_pu"].values
ssc[f:t, SSC_STATUS] = net._is_elements["ssc"].astype(np.int64)
ssc[f:t, SSC_CONTROLLABLE] = controllable & net["ssc"]["in_service"].values.astype(bool)
ppc["bus"][aux["ssc"][~controllable], BUS_TYPE] = PV
ppc["bus"][aux["ssc"][~controllable], VM] = net["ssc"].loc[~controllable, "vm_internal_pu"].values
def _build_vsc_ppc(net, ppc, mode):
length = len(net.vsc)
ppc["vsc"] = np.zeros(shape=(length, vsc_cols), dtype=np.float64)
if mode != "pf":
return
if length == 0:
return
baseMVA = ppc["baseMVA"]
bus_lookup = net["_pd2ppc_lookups"]["bus"]
bus_lookup_dc = net["_pd2ppc_lookups"]["bus_dc"]
aux = net["_pd2ppc_lookups"]["aux"]
aux_dc = net["_pd2ppc_lookups"]["aux_dc"]
f = 0
t = length
bus = bus_lookup[net.vsc["bus"].values]
bus_dc = bus_lookup_dc[net.vsc["bus_dc"].values]
controllable = net["vsc"]["controllable"].values.astype(bool)
mode_ac = net["vsc"]["control_mode_ac"].values
mode_dc = net["vsc"]["control_mode_dc"].values
value_ac = net["vsc"]["control_value_ac"].values
value_dc = net["vsc"]["control_value_dc"].values
vsc = ppc["vsc"]
baseV = ppc["bus"][bus, BASE_KV]
baseZ = baseV ** 2 / baseMVA
baseVDC = ppc["bus_dc"][bus_dc, DC_BASE_KV]
baseR = baseVDC ** 2 / baseMVA
vsc[f:t, VSC_BUS] = bus
vsc[f:t, VSC_INTERNAL_BUS] = bus_lookup[aux["vsc"]]
vsc[f:t, VSC_BUS_DC] = bus_dc
vsc[f:t, VSC_INTERNAL_BUS_DC] = bus_lookup_dc[aux_dc["vsc"]]
vsc[f:t, VSC_R] = net["vsc"]["r_ohm"].values / baseZ
vsc[f:t, VSC_X] = net["vsc"]["x_ohm"].values / baseZ
vsc[f:t, VSC_R_DC] = net["vsc"]["r_dc_ohm"].values / baseR
vsc[f:t, VSC_PL_DC] = net["vsc"]["pl_dc_mw"].values / baseMVA
if np.any(~np.isin(mode_ac, ["vm_pu", "q_mvar", "slack"])):
raise NotImplementedError("VSC element only supports the following control modes for AC side: vm_pu, q_mvar")
if np.any(~np.isin(mode_dc, ["vm_pu", "p_mw"])):
raise NotImplementedError("VSC element only supports the following control modes for AC side: vm_pu, q_mvar")
mode_ac_code = np.where(mode_ac == "vm_pu", VSC_MODE_AC_V,
np.where(mode_ac == "q_mvar", VSC_MODE_AC_Q, VSC_MODE_AC_SL))
vsc[f:t, VSC_MODE_AC] = mode_ac_code
vsc[f:t, VSC_VALUE_AC] = np.where((mode_ac_code == VSC_MODE_AC_V) | (mode_ac_code == VSC_MODE_AC_SL),
value_ac, value_ac / baseMVA)
mode_dc_code = np.where(mode_dc == "vm_pu", VSC_MODE_DC_V, VSC_MODE_DC_P)
vsc[f:t, VSC_MODE_DC] = mode_dc_code
vsc[f:t, VSC_VALUE_DC] = np.where(mode_dc == "vm_pu", value_dc, value_dc / baseMVA)
vsc[f:t, VSC_STATUS] = net._is_elements["vsc"].astype(np.int64)
vsc[f:t, VSC_CONTROLLABLE] = controllable & net["vsc"]["in_service"].values.astype(bool)
ppc["bus"][aux["vsc"][~controllable], BUS_TYPE] = PV
# it has a role of REF but internally it is PQ and we set the behavior of REF with the Jacobian and mismatch:
ppc["bus"][bus[(mode_ac_code == VSC_MODE_AC_SL) & (ppc["bus"][bus, BUS_TYPE] != NONE)], BUS_TYPE] = REF
# maybe we add this in the future
# ppc["bus"][aux["vsc"][~controllable], VM] = net["vsc"].loc[~controllable, "vm_internal_pu"].values
# Short circuit relevant routines
def _add_ext_grid_sc_impedance(net, ppc):
mode = net._options["mode"]
bus_lookup = net["_pd2ppc_lookups"]["bus"]
if mode == "sc":
case = net._options["case"]
else:
case = "max"
eg = net["ext_grid"][net._is_elements["ext_grid"]]
if len(eg) == 0:
return
eg_buses = eg.bus.values
eg_buses_ppc = bus_lookup[eg_buses]
if mode == "sc":
c = ppc["bus"][eg_buses_ppc, C_MAX] if case == "max" else ppc["bus"][eg_buses_ppc, C_MIN]
else:
c = 1.1
if not "s_sc_%s_mva" % case in eg:
raise ValueError(("short circuit apparent power s_sc_%s_mva needs to be specified for "
"external grid \n Try: net.ext_grid['s_sc_max_mva'] = 1000") % case)
s_sc = eg["s_sc_%s_mva" % case].values/ppc['baseMVA']
if not "rx_%s" % case in eg:
raise ValueError(("short circuit R/X rate rx_%s needs to be specified for external grid \n"
" Try: net.ext_grid['rx_max'] = 0.1") % case)
rx = eg["rx_%s" % case].values
z_grid = c / s_sc
if mode == 'pf_3ph':
z_grid = c / (s_sc/3) # 3 phase power divided to get 1 ph power
x_grid = z_grid / np.sqrt(rx ** 2 + 1)
r_grid = rx * x_grid
eg["r"] = r_grid
eg["x"] = x_grid
y_grid = 1 / (r_grid + x_grid * 1j)
buses, gs, bs = _sum_by_group(eg_buses_ppc, y_grid.real, y_grid.imag)
if mode == "sc":
ppc["bus"][buses, GS] += gs * ppc['baseMVA']
ppc["bus"][buses, BS] += bs * ppc['baseMVA']
else:
ppc["bus"][buses, GS] = gs * ppc['baseMVA']
ppc["bus"][buses, BS] = bs * ppc['baseMVA']
return gs * ppc['baseMVA'], bs * ppc['baseMVA']
def _add_motor_impedances_ppc(net, ppc):
if net._options["case"] == "min":
return
motor = net["motor"][net._is_elements["motor"]]
if motor.empty:
return
for par in ["vn_kv", "lrc_pu", "efficiency_n_percent", "cos_phi_n", "rx", "pn_mech_mw"]:
if any(pd.isnull(motor[par])):
raise UserWarning("%s needs to be specified for all motors in net.motor.%s" % (
par, par))
bus_lookup = net["_pd2ppc_lookups"]["bus"]
motor_buses_ppc = bus_lookup[motor.bus.values]
vn_net = ppc["bus"][motor_buses_ppc, BASE_KV]
efficiency = motor.efficiency_n_percent.values
cos_phi = motor.cos_phi_n.values
p_mech = motor.pn_mech_mw.values
vn_kv = motor.vn_kv.values
lrc = motor.lrc_pu.values
rx = motor.rx.values
s_motor = p_mech / (efficiency/100 * cos_phi)
z_motor_ohm = 1 / lrc * vn_kv**2 / s_motor
z_motor_pu = z_motor_ohm / vn_net**2
x_motor_pu = z_motor_pu / np.sqrt(rx ** 2 + 1)
r_motor_pu = rx * x_motor_pu
y_motor_pu = 1 / (r_motor_pu + x_motor_pu * 1j)
buses, gs, bs = _sum_by_group(motor_buses_ppc, y_motor_pu.real, y_motor_pu.imag)
ppc["bus"][buses, GS] += gs
ppc["bus"][buses, BS] += bs
def _add_load_sc_impedances_ppc(net, ppc):
baseMVA = ppc["baseMVA"]
bus_lookup = net["_pd2ppc_lookups"]["bus"]
for element_type, sign in (("sgen", -1), ("load", 1)):
element = net[element_type][net._is_elements[element_type]]
if element.empty:
continue
element_buses_ppc = bus_lookup[element.bus.values]
vm_pu = ppc["bus"][element_buses_ppc, VM]
va_degree = ppc["bus"][element_buses_ppc, VA]
v = vm_pu * np.exp(1j * np.deg2rad(va_degree)) # this is correct!
# print(np.abs(v), np.angle(v, deg=True))
s_element_mva = sign * (element.p_mw.values + 1j * element.q_mvar.values) * element.scaling.values
s_element_pu = s_element_mva / baseMVA
# S = V * conj(I) -> I = conj(S / V)
i_element_pu = np.conj(s_element_pu / v) # this is correct!
# i_element_ka = -i_element_pu * 100 / (np.sqrt(3) * 110) # for us to validate
y_element_pu = i_element_pu / v # p.u.
# y_element_s = y_element_pu * baseMVA / v_base**2
buses, gs, bs = _sum_by_group(element_buses_ppc, y_element_pu.real, y_element_pu.imag)
# buses, gs, bs = _sum_by_group(element_buses_ppc, s_element_pu.real, s_element_pu.imag)
ppc["bus"][buses, GS] += gs * baseMVA # power in p.u. is equal to admittance in p.u.
ppc["bus"][buses, BS] += bs * baseMVA
def _add_c_to_ppc(net, ppc):
ppc["bus"][:, C_MAX] = 1.1
ppc["bus"][:, C_MIN] = 1.
lv_buses = np.where(ppc["bus"][:, BASE_KV] < 1.)
if len(lv_buses) > 0:
lv_tol_percent = net["_options"]["lv_tol_percent"]
if lv_tol_percent == 10:
c_ns = 1.1
elif lv_tol_percent == 6:
c_ns = 1.05
else:
raise ValueError("Voltage tolerance in the low voltage grid has" +
" to be either 6% or 10% according to IEC 60909")
ppc["bus"][lv_buses, C_MAX] = c_ns
ppc["bus"][lv_buses, C_MIN] = .95