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test_1ph.py
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test_1ph.py
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# -*- coding: utf-8 -*-
# Copyright (c) 2016-2023 by University of Kassel and Fraunhofer Institute for Energy Economics
# and Energy System Technology (IEE), Kassel. All rights reserved.
import pandapower as pp
import pandapower.shortcircuit as sc
import pandapower.test
import numpy as np
import os
import pytest
def check_results(net, vc, result):
res_ika = net.res_bus_sc[(net.bus.zone==vc) & (net.bus.in_service)].ikss_ka.values
if not np.allclose(result, res_ika, rtol=0, atol=1e-6):
raise ValueError("Incorrect results for vector group %s"%vc, res_ika, result)
def add_network(net, vector_group):
b1 = pp.create_bus(net, 110, zone=vector_group, index=pp.get_free_id(net.bus))
b2 = pp.create_bus(net, 20, zone=vector_group)
pp.create_bus(net, 20, in_service=False)
b3 = pp.create_bus(net, 20, zone=vector_group)
b4 = pp.create_bus(net, 20, zone=vector_group)
pp.create_bus(net, 20)
pp.create_ext_grid(net, b1, s_sc_max_mva=100, s_sc_min_mva=100, rx_min=0.35, rx_max=0.35)
net.ext_grid["r0x0_max"] = 0.4
net.ext_grid["x0x_max"] = 1.0
net.ext_grid["r0x0_min"] = 0.4
net.ext_grid["x0x_min"] = 1.0
pp.create_std_type(net, {"r_ohm_per_km": 0.122, "x_ohm_per_km": 0.112, "c_nf_per_km": 304,
"max_i_ka": 0.421, "endtemp_degree": 70.0, "r0_ohm_per_km": 0.244,
"x0_ohm_per_km": 0.336, "c0_nf_per_km": 2000}, "unsymmetric_line_type")
l1 = pp.create_line(net, b2, b3, length_km=10, std_type="unsymmetric_line_type",
index=pp.get_free_id(net.line)+1)
l2 = pp.create_line(net, b3, b4, length_km=15, std_type="unsymmetric_line_type")
pp.create_line(net, b3, b4, length_km=15, std_type="unsymmetric_line_type", in_service=False)
transformer_type = {"i0_percent": 0.071, "pfe_kw": 29, "vkr_percent": 0.282,
"sn_mva": 25, "vn_lv_kv": 20.0, "vn_hv_kv": 110.0, "vk_percent": 11.2,
"shift_degree": 150, "vector_group": vector_group, "tap_side": "hv",
"tap_neutral": 0, "tap_min": -9, "tap_max": 9, "tap_step_degree": 0,
"tap_step_percent": 1.5, "tap_phase_shifter": False, "vk0_percent": 5,
"vkr0_percent": 0.4, "mag0_percent": 10, "mag0_rx": 0.4,
"si0_hv_partial": 0.9}
pp.create_std_type(net, transformer_type, vector_group, "trafo")
t1 = pp.create_transformer(net, b1, b2, std_type=vector_group, parallel=2,
index=pp.get_free_id(net.trafo)+1)
pp.create_transformer(net, b1, b2, std_type=vector_group, in_service=False)
pp.add_zero_impedance_parameters(net)
return l1, l2, t1
def test_1ph_shortcircuit():
# vector groups without "N" have no impact on the 1ph
results = {
"Yy": [0.52209347337, 0.74400073149, 0.74563682772, 0.81607276962]
,"Yyn": [0.52209347337, 2.5145986133, 1.6737892808, 1.1117955913 ]
,"Yd": [0.52209347337, 0.74400073149, 0.74563682772, 0.81607276962]
,"YNy": [0.6291931171, 0.74400073149, 0.74563682772, 0.81607276962]
,"YNyn":[0.62623661918, 2.9829679356, 1.8895041867, 1.2075537026 ]
,"YNd": [0.75701600162, 0.74400073149, 0.74563682772, 0.81607276962]
,"Dy": [0.52209347337, 0.74400073149, 0.74563682772, 0.81607276962]
,"Dyn": [0.52209347337, 3.5054043285, 2.1086590382, 1.2980120038 ]
,"Dd": [0.52209347337, 0.74400073149, 0.74563682772, 0.81607276962]
}
for vc, result in results.items():
net = pp.create_empty_network(sn_mva=17)
add_network(net, vc)
try:
sc.calc_sc(net, fault="1ph", case="max")
except Exception as e:
raise UserWarning(f"{str(e)}: Did not converge after adding transformer with vector group {vc}")
check_results(net, vc, result)
def test_1ph_shortcircuit_3w():
# vector groups without "N" have no impact on the 1ph
# here we check both functions, with Y invertion and with LU factorization for individual buses
# The cuirrents are taken from the calculation with commercial software for reference
results = {
"ddd": [1.5193429, 0, 0],
"ddy": [1.5193429, 0, 0],
"dyd": [1.5193429, 0, 0],
"dyy": [1.5193429, 0, 0],
"ydd": [1.5193429, 0, 0],
"ydy": [1.5193429, 0, 0],
"yyd": [1.5193429, 0, 0],
"yyy": [1.5193429, 0, 0],
"ynyd": [1.783257, 0, 0],
"yndy": [1.79376470, 0, 0], # ok
"yynd": [1.5193429, 3.339398, 0],
"ydyn": [1.5193429, 0, 8.836452], # ok
"ynynd": [1.783257, 3.499335, 0],
"yndyn": [1.79376470, 0, 9.04238714], # ok
"yndd": [1.843545, 0, 0],
"ynyy": [1.5193429, 0, 0] # ok but why?
}
for vg, result in results.items():
net = single_3w_trafo_grid(vg)
sc.calc_sc(net, fault="1ph", case="max")
assert np.allclose(net.res_bus_sc.ikss_ka.values, result, rtol=0, atol=1e-6)
net2 = single_3w_trafo_grid(vg)
for bus in net2.bus.index.values:
sc.calc_sc(net2, fault="1ph", case="max", inverse_y=False, bus=bus)
assert np.allclose(net.res_bus_sc.ikss_ka.at[bus], net2.res_bus_sc.ikss_ka.at[bus], rtol=0, atol=1e-9)
def test_1ph_shortcircuit_min():
results = {
"Yy": [0.52209346201, 0.66632662571, 0.66756160176, 0.72517293174]
,"Yyn": [0.52209346201, 2.4135757259, 1.545054139, 0.99373917957]
,"Yd": [0.52209346201, 0.66632662571, 0.66756160176, 0.72517293174]
,"YNy": [0.62316686505, 0.66632662571, 0.66756160176, 0.72517293174]
,"YNyn":[0.620287259, 2.9155736491, 1.7561556936, 1.0807305212]
,"YNd": [0.75434229157, 0.66632662571, 0.66756160176, 0.72517293174]
,"Dy": [0.52209346201, 0.66632662571, 0.66756160176, 0.72517293174]
,"Dyn": [0.52209346201, 3.4393798093, 1.9535982949, 1.1558364456]
,"Dd": [0.52209346201, 0.66632662571, 0.66756160176, 0.72517293174]
}
for inv_y in (False, True):
for vc, result in results.items():
net = pp.create_empty_network(sn_mva=16)
add_network(net, vc)
try:
sc.calc_sc(net, fault="1ph", case="min", inverse_y=inv_y)
except Exception as e:
raise UserWarning(f"{str(e)}: Did not converge after adding transformer with vector group {vc}")
check_results(net, vc, result)
def test_iec60909_example_4():
file = os.path.join(pp.pp_dir, "test", "test_files", "IEC60909-4_example.json")
net = pp.from_json(file)
for inv_y in (False, True):
sc.calc_sc(net, fault="1ph", inverse_y=inv_y)
assert np.isclose(net.res_bus_sc[net.bus.name=="Q"].ikss_ka.values[0], 10.05957231)
assert np.isclose(net.res_bus_sc[net.bus.name=="T2LV"].ikss_ka.values[0], 34.467353142)
assert np.isclose(net.res_bus_sc[net.bus.name=="F1"].ikss_ka.values[0], 35.53066312)
assert np.isclose(net.res_bus_sc[net.bus.name=="F2"].ikss_ka.values[0], 34.89135137)
assert np.isclose(net.res_bus_sc[net.bus.name=="F3"].ikss_ka.values[0], 5.0321033105)
assert np.isclose(net.res_bus_sc[net.bus.name=="Cable/Line IC"].ikss_ka.values[0], 16.362586813)
def test_iec60909_example_4_bus_selection():
file = os.path.join(pp.pp_dir, "test", "test_files", "IEC60909-4_example.json")
net = pp.from_json(file)
for inv_y in (False, True):
sc.calc_sc(net, fault="1ph", inverse_y=inv_y,
bus=net.bus[net.bus.name.isin(("F1", "F2"))].index)
assert np.isclose(net.res_bus_sc.at[net.bus[net.bus.name=="F1"].index[0],
"ikss_ka"], 35.53066312)
assert np.isclose(net.res_bus_sc.at[net.bus[net.bus.name=="F2"].index[0],
"ikss_ka"], 34.89135137)
def test_iec60909_example_4_bus_selection_br_res():
file = os.path.join(pp.pp_dir, "test", "test_files", "IEC60909-4_example.json")
net = pp.from_json(file)
for inv_y in (False, True):
sc.calc_sc(net, fault="1ph", inverse_y=inv_y,
bus=net.bus[net.bus.name.isin(("F1", "F2"))].index,
branch_results=True)
sc.calc_sc(net, fault="1ph", inverse_y=inv_y,
bus=net.bus[net.bus.name.isin(("F1", "F2"))].index,
branch_results=True, return_all_currents=True)
assert np.isclose(net.res_bus_sc.at[net.bus[net.bus.name=="F1"].index[0],
"ikss_ka"], 35.53066312)
assert np.isclose(net.res_bus_sc.at[net.bus[net.bus.name=="F2"].index[0],
"ikss_ka"], 34.89135137)
def test_1ph_with_switches():
for inv_y in (False, True):
net = pp.create_empty_network(sn_mva=67)
vc = "Yy"
l1, l2, _ = add_network(net, vc)
sc.calc_sc(net, fault="1ph", case="max", inverse_y=inv_y)
pp.create_line(net, net.line.to_bus.at[l2], net.line.from_bus.at[l1], length_km=15,
std_type="unsymmetric_line_type", parallel=2.)
pp.add_zero_impedance_parameters(net)
pp.create_switch(net, bus=net.line.to_bus.at[l2], element=l2, et="l", closed=False)
sc.calc_sc(net, fault="1ph", case="max")
check_results(net, vc, [0.52209347338, 2.0620266652, 2.3255761263, 2.3066467489])
def single_3w_trafo_grid(vector_group, sn_mva=123):
net = pp.create_empty_network(sn_mva=sn_mva)
b1 = pp.create_bus(net, vn_kv=380.)
b2 = pp.create_bus(net, vn_kv=110.)
b3 = pp.create_bus(net, vn_kv=30.)
pp.create_ext_grid(net, b1, s_sc_max_mva=1000, s_sc_min_mva=800,
rx_max=0.1, x0x_max=1, r0x0_max=0.1,
rx_min=0.1, x0x_min=1, r0x0_min=0.1)
pp.create_transformer3w_from_parameters(net,
hv_bus=b1, mv_bus=b2, lv_bus=b3,
vn_hv_kv=400, vn_mv_kv=120, vn_lv_kv=30,
sn_hv_mva=350, sn_mv_mva=350, sn_lv_mva=50,
pfe_kw=0, i0_percent=0,
vk_hv_percent=21, vkr_hv_percent=.26,
vk_mv_percent=7, vkr_mv_percent=.16,
vk_lv_percent=10., vkr_lv_percent=.16,
vk0_hv_percent=44.1, vkr0_hv_percent=0.26,
vk0_mv_percent=6.2996, vkr0_mv_percent=0.03714,
vk0_lv_percent=6.2996, vkr0_lv_percent=0.03714,
vector_group=vector_group)
return net
def iec_60909_4_small(n_t3=1, num_earth=1, with_gen=False):
net = pp.create_empty_network(sn_mva=3)
b1 = pp.create_bus(net, vn_kv=380.)
b2 = pp.create_bus(net, vn_kv=110.)
b3 = pp.create_bus(net, vn_kv=110.)
b5 = pp.create_bus(net, vn_kv=110.)
b8 = pp.create_bus(net, vn_kv=30.)
HG2 = pp.create_bus(net, vn_kv=10)
pp.create_ext_grid(net, b1, s_sc_max_mva=38 * 380 * np.sqrt(3), rx_max=0.1, x0x_max=3, r0x0_max=0.15,
s_sc_min_mva=38 * 380 * np.sqrt(3) / 10, rx_min=0.1, x0x_min=3, r0x0_min=0.15,)
pp.create_ext_grid(net, b5, s_sc_max_mva=16 * 110 * np.sqrt(3), rx_max=0.1, x0x_max=3.3, r0x0_max=0.2,
s_sc_min_mva=16 * 110 * np.sqrt(3) / 10, rx_min=0.1, x0x_min=3.3, r0x0_min=0.2)
if num_earth == 1:
vector_group = ("YYNd", "YNYd")
else:
vector_group = ("YNYNd", "YNYNd")
if n_t3==2:
pp.create_transformer3w_from_parameters(net,
hv_bus=b1, mv_bus=b2, lv_bus=b8,
vn_hv_kv=400, vn_mv_kv=120, vn_lv_kv=30,
sn_hv_mva=350, sn_mv_mva=350, sn_lv_mva=50,
pfe_kw=0, i0_percent=0,
vk_hv_percent=21, vkr_hv_percent=.26,
vk_mv_percent=7, vkr_mv_percent=.16,
vk_lv_percent=10., vkr_lv_percent=.16,
vk0_hv_percent=44.1, vkr0_hv_percent=0.26,
vk0_mv_percent=6.2996, vkr0_mv_percent=0.03714,
vk0_lv_percent=6.2996, vkr0_lv_percent=0.03714,
vector_group=vector_group[0])
pp.create_transformer3w_from_parameters(net,
hv_bus=b1, mv_bus=b2, lv_bus=b8,
vn_hv_kv=400, vn_mv_kv=120, vn_lv_kv=30,
sn_hv_mva=350, sn_mv_mva=350, sn_lv_mva=50,
pfe_kw=0, i0_percent=0,
vk_hv_percent=21, vkr_hv_percent=.26,
vk_mv_percent=7, vkr_mv_percent=.16,
vk_lv_percent=10., vkr_lv_percent=.16,
vk0_hv_percent=44.1, vkr0_hv_percent=0.26,
vk0_mv_percent=6.2996, vkr0_mv_percent=0.03714,
vk0_lv_percent=6.2996, vkr0_lv_percent=0.03714,
vector_group=vector_group[1])
pp.create_line_from_parameters(net, b2, b3, name="L1",
c_nf_per_km=0, max_i_ka=0, # FIXME: Optional for SC
length_km=20, r_ohm_per_km=0.12, x_ohm_per_km=0.39,
r0_ohm_per_km=0.32, x0_ohm_per_km=1.26, c0_nf_per_km=0, g0_us_per_km=0, endtemp_degree=80)
pp.create_line_from_parameters(net, b2, b5, name="L3a",
c_nf_per_km=0, max_i_ka=0,
length_km=5, r_ohm_per_km=0.12, x_ohm_per_km=0.39,
r0_ohm_per_km=0.52, x0_ohm_per_km=1.86, c0_nf_per_km=0, g0_us_per_km=0, endtemp_degree=80)
pp.create_line_from_parameters(net, b2, b5, name="L3b",
c_nf_per_km=0, max_i_ka=0,
length_km=5, r_ohm_per_km=0.12, x_ohm_per_km=0.39,
r0_ohm_per_km=0.52, x0_ohm_per_km=1.86, c0_nf_per_km=0, g0_us_per_km=0, endtemp_degree=80)
pp.create_line_from_parameters(net, b5, b3, name="L4",
c_nf_per_km=0, max_i_ka=0,
length_km=10, r_ohm_per_km=0.096, x_ohm_per_km=0.388,
r0_ohm_per_km=0.22, x0_ohm_per_km=1.1, c0_nf_per_km=0, g0_us_per_km=0, endtemp_degree=80)
if with_gen:
t1 = pp.create_transformer_from_parameters(net, b3, HG2, sn_mva=100,
pfe_kw=0, i0_percent=0, vn_hv_kv=120., vn_lv_kv=10.5, vk_percent=12, vkr_percent=0.5,
vk0_percent=12, vkr0_percent=0.5, mag0_percent=100, mag0_rx=0, si0_hv_partial=0.5,
shift_degree=5, vector_group="Yd", power_station_unit=True)
pp.create_gen(net, HG2, p_mw=0.9 * 100, vn_kv=10.5,
xdss_pu=0.16, rdss_ohm=0.005, cos_phi=0.9, sn_mva=100, pg_percent=7.5,
slack=True, power_station_trafo=t1)
return net
def iec_60909_4_t1():
net = pp.create_empty_network(sn_mva=26)
pp.create_bus(net, vn_kv=110.)
pp.create_bus(net, vn_kv=20.)
t1 = pp.create_transformer_from_parameters(net, 0, 1, sn_mva=150,
pfe_kw=0, i0_percent=0,
vn_hv_kv=115., vn_lv_kv=21, vk_percent=16, vkr_percent=0.5,
pt_percent=12, oltc=True, vk0_percent=15.2,
vkr0_percent=0.5, xn_ohm=22, vector_group="YNd",
mag0_percent=100, mag0_rx=0, si0_hv_partial=0.5,
power_station_unit=True)
pp.create_gen(net, 1, p_mw=0.85 * 150, vn_kv=21,
xdss_pu=0.14, rdss_ohm=0.002, cos_phi=0.85, sn_mva=150, pg_percent=0,
power_station_trafo=t1)
return net
def vde_232():
net = pp.create_empty_network(sn_mva=12)
# hv buses
pp.create_bus(net, 110)
pp.create_bus(net, 21)
pp.create_ext_grid(net, 0, s_sc_max_mva=13.61213 * 110 * np.sqrt(3), rx_max=0.20328,
x0x_max=3.47927, r0x0_max=3.03361*0.20328/3.47927)
pp.create_transformer_from_parameters(net, 0, 1, 150, 115, 21, 0.5, 16,
pfe_kw=0, i0_percent=0, tap_step_percent=1,
tap_max=12, tap_min=-12, tap_neutral=0, tap_side='hv',
vector_group="YNd",
vk0_percent=np.sqrt(np.square(0.95*15.99219) + np.square(0.5)),
vkr0_percent=0.5,
mag0_percent=100, mag0_rx=0,
si0_hv_partial=0.9,
pt_percent=12, oltc=True,
power_station_unit=True,
xn_ohm=22)
pp.create_gen(net, 1, 150, 1, 150, vn_kv=21, xdss_pu=0.14, rdss_ohm=0.002, cos_phi=0.85, power_station_trafo=0, pg_percent=5)
# z_q
u_nq = 110
i_kqss = 13.61213
z_q = 1.1 * u_nq / (np.sqrt(3) * i_kqss)
rx_max = 0.20328
x_q = z_q / np.sqrt(1+rx_max**2)
x_0q = x_q * 3.47927
r_0q = x_0q * 3.03361*0.20328/3.47927
z_0q = r_0q + 1j*x_0q
return net
def test_iec60909_example_4_one_trafo3w():
net = iec_60909_4_small(n_t3=1)
# r0 = 2.378330877
# x0 = 17.335578502
# r = 0.59621204768
# x = 6.0598429694
ikss_pf = [24.4009, 8.2481, 6.1728, 10.1851]
sc.calc_sc(net, fault="1ph")
assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_pf), atol=1e-4)
def test_iec60909_example_4_two_trafo3w():
net = iec_60909_4_small(n_t3=2)
ikss_pf_2t3 = [24.5772, 14.7247, 8.1060, 15.2749]
sc.calc_sc(net, fault="1ph")
assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_pf_2t3), atol=1e-4)
def test_iec60909_example_4_two_trafo3w_two_earth():
net = iec_60909_4_small(n_t3=2, num_earth=2)
# r0 = 2.378330877
# x0 = 17.335578502
# r = 0.59621204768
# x = 6.0598429694
ikss_pf_max = [26.0499, 20.9472, 9.1722, 18.7457]
ikss_pf_min = [3.9622, 8.3914, 5.0248, 6.9413]
sc.calc_sc(net, fault="1ph", case="max")
assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_pf_max), atol=1e-4)
sc.calc_sc(net, fault="1ph", case="min")
assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_pf_min), atol=1e-4)
@pytest.mark.skip("1ph gen-close sc calculation still under develop")
def test_iec_60909_4_small_with_t2_1ph():
net = iec_60909_4_small(n_t3=2, num_earth=1, with_gen=True)
net.gen = net.gen.iloc[0:0, :]
sc.calc_sc(net, fault="1ph", case="max", ip=True, tk_s=0.1, kappa_method="C")
ikss_max = [24.57717, 16.96235, 11.6109, 18.07836]
# ikss_min = [3.5001, 8.4362, 7.4743, 7.7707]
assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_max), atol=1e-4)
@pytest.mark.skip("1ph gen-close sc calculation still under develop")
def test_iec_60909_4_small_with_gen_1ph_no_ps_detection():
net = iec_60909_4_small(n_t3=2, num_earth=1, with_gen=True)
net.gen.power_station_trafo=np.nan
net.trafo.power_station_unit=np.nan
sc.calc_sc(net, fault="1ph", case="max", ip=True, tk_s=0.1, kappa_method="C")
ikss_max = [24.60896, 17.2703, 12.3771, 18.4723]
# ikss_min = [3.5001, 8.4362, 7.4743, 7.7707]
# ip_min = [8.6843, 21.6173, 18.0242, 19.4261]
assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_max), atol=1e-4)
def test_iec_60909_4_small_with_gen_ps_unit_1ph():
net = iec_60909_4_small(n_t3=2, num_earth=1, with_gen=True)
sc.calc_sc(net, fault="1ph", case="max", ip=True, tk_s=0.1, kappa_method="C")
ikss_max = [24.6109, 17.4363, 12.7497, 18.6883]
# ikss_min = [3.5001, 8.4362, 7.4743, 7.7707]
# ip_min = [8.6843, 21.6173, 18.0242, 19.4261]
# TODO: This needs to be fixed!!
# assert np.allclose(net.res_bus_sc.ikss_ka.values[:4], np.array(ikss_max), atol=1e-4)
def test_vde_232_with_gen_ps_unit_1ph():
# IEC 60909-4:2021, example from section 4.4.2
# from pandapower.test.shortcircuit.test_1ph import *
# from pandapower.pypower.idx_bus import *
net = vde_232()
sc.calc_sc(net, fault="1ph", case="max", ip=True, tk_s=0.1, kappa_method="C")
assert np.isclose(net.res_bus_sc.at[0, 'ikss_ka'], 9.04979, rtol=0, atol=1e-4)
assert np.isclose(net.res_bus_sc.at[0, 'rk0_ohm'], 2.09392, rtol=0, atol=1e-4)
assert np.isclose(net.res_bus_sc.at[0, 'xk0_ohm'], 14.3989, rtol=0, atol=1e-4)
def test_t1_iec60909_4():
net = iec_60909_4_t1()
sc.calc_sc(net, fault="1ph", case="max", ip=True, tk_s=0.1, kappa_method="C")
assert np.isclose(net.res_bus_sc.at[0, 'ikss_ka'], 1.587457, rtol=0, atol=1e-4)
assert np.isclose(net.res_bus_sc.at[0, 'rk0_ohm'], 0.439059, rtol=0, atol=1e-4)
assert np.isclose(net.res_bus_sc.at[0, 'xk0_ohm'], 79.340169, rtol=0, atol=1e-4)
assert np.isclose(net.res_bus_sc.at[0, 'rk_ohm'], 0.498795, rtol=0, atol=1e-4)
assert np.isclose(net.res_bus_sc.at[0, 'xk_ohm'], 26.336676, rtol=0, atol=1e-4)
def test_1ph_sn_mva_ext_grid():
net1 = pp.create_empty_network(sn_mva=1)
b1 = pp.create_bus(net1, 110)
pp.create_ext_grid(net1, b1, s_sc_max_mva=1000, s_sc_min_mva=800,
rx_max=0.1, x0x_max=1, r0x0_max=0.1,
rx_min=0.1, x0x_min=1, r0x0_min=0.1)
net2 = pp.create_empty_network(sn_mva=17)
b1 = pp.create_bus(net2, 110)
pp.create_ext_grid(net2, b1, s_sc_max_mva=1000, s_sc_min_mva=800,
rx_max=0.1, x0x_max=1, r0x0_max=0.1,
rx_min=0.1, x0x_min=1, r0x0_min=0.1)
sc.calc_sc(net1, fault="1ph", case="max")
sc.calc_sc(net2, fault="1ph", case="max")
res = {'ikss_ka': 5.2486388108147795,
'rk0_ohm': 1.3243945001694957,
'xk0_ohm': 13.243945001694957,
'rk_ohm': 1.3243945001694957,
'xk_ohm': 13.243945001694957}
for var in res.keys():
assert np.allclose(net1.res_bus_sc[var], net2.res_bus_sc[var], atol=1e-6, rtol=0)
assert np.allclose(net1.res_bus_sc[var], res[var], atol=1e-6, rtol=0)
def test_line():
net = pp.create_empty_network(sn_mva=17)
b1 = pp.create_bus(net, 110)
pp.create_ext_grid(net, b1, s_sc_max_mva=1000, s_sc_min_mva=800,
rx_max=0.1, x0x_max=1, r0x0_max=0.1,
rx_min=0.1, x0x_min=1, r0x0_min=0.1)
b2 = pp.create_bus(net, 110)
pp.create_line_from_parameters(net, b1, b2, 1, 1, 0.5, 0., 10, r0_ohm_per_km=4, x0_ohm_per_km=0.25, c0_nf_per_km=0.)
sc.calc_sc(net, fault="1ph", case="max")
assert np.allclose(net.res_bus_sc.ikss_ka, [5.248639, 4.968909], rtol=0, atol=1e-6)
res = net.res_bus_sc.copy()
sc.calc_sc(net, fault="1ph", case="max")
assert np.allclose(net.res_bus_sc, res, rtol=0, atol=1e-6)
def test_trafo():
results = {
"Yy": [5.248639, 0],
"Yyn": [5.248639, 0.812581],
"Yd": [5.248639, 0],
"Dy": [5.248639, 0],
"Dd": [5.248639, 0],
"Dyn": [5.248639, 17.245191],
"YNd": [6.324033, 0],
"YNy": [5.265657, 0],
"YNyn": [5.265737, 14.413729]}
for vc in results.keys():
net = pp.create_empty_network(sn_mva=1)
pp.create_bus(net, vn_kv=110.)
pp.create_bus(net, vn_kv=20.)
pp.create_ext_grid(net, 0, s_sc_max_mva=1000, s_sc_min_mva=800,
rx_max=0.1, x0x_max=1, r0x0_max=0.1,
rx_min=0.1, x0x_min=1, r0x0_min=0.1)
t1 = pp.create_transformer_from_parameters(net, 0, 1, sn_mva=150,
pfe_kw=10, i0_percent=0.1,
vn_hv_kv=115., vn_lv_kv=21, vk_percent=16, vkr_percent=0.5,
pt_percent=12, vk0_percent=15.2,
vkr0_percent=0.5, vector_group=vc,
mag0_percent=100, mag0_rx=0, si0_hv_partial=0.5)
sc.calc_sc(net, fault="1ph", case="max")
res = net.res_bus_sc.copy()
net.sn_mva = 123
sc.calc_sc(net, fault="1ph", case="max")
assert np.allclose(net.res_bus_sc, res, rtol=0, atol=1e-6), f"failed for vector group {vc}"
assert np.allclose(net.res_bus_sc.ikss_ka, results[vc], rtol=0, atol=1e-6), f"{vc}: inconsistent results"
def test_sc_1ph_impedance():
net = pp.create_empty_network()
pp.create_buses(net, 2, 110)
pp.create_ext_grid(net, 0, s_sc_max_mva=1000, s_sc_min_mva=800,
rx_max=0.1, x0x_max=1, r0x0_max=0.1,
rx_min=0.1, x0x_min=1, r0x0_min=0.1)
pp.create_impedance(net, 0, 1, rft_pu=0.2, xft_pu=0.4, sn_mva=50, rtf_pu=0.25, xtf_pu=0.5,
rft0_pu=0.1, xft0_pu=0.2, rtf0_pu=0.05, xtf0_pu=0.1)
sc.calc_sc(net, fault="1ph")
assert np.allclose(net.res_bus_sc.ikss_ka, [5.248639, 0.625166], rtol=0, atol=1e-6)
assert np.allclose(net.res_bus_sc.rk0_ohm, [1.324394, 12.762198], rtol=0, atol=1e-6)
assert np.allclose(net.res_bus_sc.xk0_ohm, [13.243945, 30.821973], rtol=0, atol=1e-6)
assert np.allclose(net.res_bus_sc.rk_ohm, [1.3243945, 62.1554916], rtol=0, atol=1e-5)
assert np.allclose(net.res_bus_sc.xk_ohm, [13.2439445, 137.5549268], rtol=0, atol=1e-5)
if __name__ == "__main__":
pytest.main([__file__])