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SparseMatrixErrors: power flow and short circuit special case #1175

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934cacf
add cases
nitbharambe Oct 31, 2025
49aaadc
add small admittance
nitbharambe Nov 10, 2025
fff6c74
approach 2
nitbharambe Nov 11, 2025
9e4c593
minor
nitbharambe Nov 11, 2025
859990e
minor 2
nitbharambe Nov 11, 2025
963dc83
address comment
nitbharambe Nov 12, 2025
bca9cb2
try 1e-12
nitbharambe Nov 12, 2025
b45f026
add tests
nitbharambe Nov 12, 2025
527e502
remove excess
nitbharambe Nov 12, 2025
31997d9
add iteration diverge for xfail
nitbharambe Nov 12, 2025
fe07fd4
rename case
nitbharambe Nov 12, 2025
99f4788
Merge branch 'main' into fix/sparse-matrix-errors-transformers
TonyXiang8787 Nov 13, 2025
a7834d9
[skip ci] down merge, add cassert
TonyXiang8787 Nov 13, 2025
6ccbdfa
[skip ci] restructure test
TonyXiang8787 Nov 13, 2025
b9c4e61
add suceeded scenarios
nitbharambe Nov 13, 2025
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1 change: 1 addition & 0 deletions power_grid_model_c/power_grid_model/include/power_grid_model/common/common.hpp
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Expand Up @@ -4,6 +4,7 @@

#pragma once

#include <cassert>
#include <cmath>
#include <complex>
#include <concepts>
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25 changes: 25 additions & 0 deletions power_grid_model_c/power_grid_model/include/power_grid_model/component/transformer.hpp
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Expand Up @@ -258,6 +258,21 @@ class Transformer : public Branch {
param0.ytt() = y0_series;
}

auto const low_admittance = 0.5 * 1e-12 * sn_ / base_power_3p / uk_;
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@petersalemink95 petersalemink95 Nov 14, 2025

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Should we call this admittance of susceptance? Since we're only adding it to the imaginary part of Y = G + jB

bool const zero_seq_available_from =
(winding_from_ == WindingType::wye_n && winding_to_ == WindingType::wye_n) ||
(winding_from_ == WindingType::wye_n && winding_to_ == WindingType::delta) ||
winding_from_ == WindingType::zigzag_n;
bool const zero_seq_available_to = (winding_to_ == WindingType::wye_n && winding_from_ == WindingType::wye_n) ||
(winding_to_ == WindingType::wye_n && winding_from_ == WindingType::delta) ||
winding_to_ == WindingType::zigzag_n;
if (!zero_seq_available_from && from_status()) {
param0.yff() += DoubleComplex{0.0, -low_admittance};
}
if (!zero_seq_available_to && to_status()) {
param0.ytt() += DoubleComplex{0.0, -low_admittance};
}

// for the rest param0 is zero
// calculate yabc
ComplexTensor<asymmetric_t> const sym_matrix = get_sym_matrix();
Expand All @@ -269,6 +284,16 @@ class Transformer : public Branch {
y012 << param0.value[i], 0.0, 0.0, 0.0, param1.value[i], 0.0, 0.0, 0.0, param2.value[i];
param.value[i] = dot(sym_matrix, y012, sym_matrix_inv);
}

// for (size_t phase = 0; phase < 3; ++phase) {
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@petersalemink95 petersalemink95 Nov 14, 2025 •
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Just a reminder that there is commented out code here


// if (from_status()) {
// param.yff()(phase, phase) += DoubleComplex{0.0, -low_from_admittance};
// }
// if (to_status()) {
// param.ytt()(phase, phase) += DoubleComplex{0.0, -low_to_admittance};
// }
// }
return param;
}
};
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21 changes: 21 additions & 0 deletions ...ower_flow/floating-ground-edge-case/floating-ground-no-error/delta-wye_n/asym_output.json
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{
"version": "1.0",
"type": "asym_output",
"is_batch": false,
"attributes": {},
"data": {
"node": [
{"id": 1, "energized": 1, "u_pu": [0.99999999999992251, 0.99999999999992251, 0.99999999999992251], "u": [5773.5026918958101, 5773.5026918958101, 5773.5026918958101], "u_angle": [6.3296256469447942e-14, -2.0943951023931322, 2.0943951023932588], "p": [3.3332500041435393, 3.3332500041126596, 3.3332500041243667], "q": [33.165418788836249, 33.165418788872792, 33.165418788742407]},
{"id": 2, "energized": 1, "u_pu": [0.9999500024997976, 0.99995000249979771, 0.99995000249979749], "u": [57.732140311942509, 57.732140311942516, 57.732140311942501], "u_angle": [-0.52359877559823542, -2.6179938779914309, 1.5707963267949601], "p": [-2.4789040786828292e-12, -4.9578081573761396e-12, 2.7754187906233796e-11], "q": [-4.1299171686348346e-11, 8.2598343372696058e-11, -3.7005583874973505e-11]}
],
"transformer": [
{"id": 4, "energized": 1, "loading": 0.00099997500124996796, "p_from": [3.3332500041435393, 3.3332500041126596, 3.3332500041243667], "q_from": [33.165418788836249, 33.165418788872792, 33.165418788742407], "i_from": [0.0057733583615496827, 0.0057733583615554463, 0.0057733583615331785], "s_from": [33.332500041686274, 33.332500041719548, 33.332500041590983], "p_to": [-2.4789040786828292e-12, -4.9578081573761396e-12, 2.7754187906233796e-11], "q_to": [-4.1299171686348346e-11, 8.2598343372696058e-11, -3.7005583874973505e-11], "i_to": [7.1664588082487635e-13, 1.4332917616497527e-12, 8.012344526598183e-13], "s_to": [4.1373500545757385e-11, 8.2747001091514797e-11, 4.6256979843719079e-11]}
],
"source": [
{"id": 3, "energized": 1, "p": [3.3332500041435393, 3.3332500041126596, 3.3332500041243667], "q": [33.165418788836249, 33.165418788872792, 33.165418788742414], "i": [0.0057733583615496827, 0.0057733583615554454, 0.0057733583615331794], "s": [33.332500041686274, 33.332500041719541, 33.33250004159099], "pf": [0.099999999999247344, 0.099999999998221123, 0.099999999998958006]}
],
"asym_load": [
{"id": 21, "energized": 0, "p": [-0, -0, -0], "q": [-0, -0, -0], "i": [0, 0, 0], "s": [0, 0, 0], "pf": [0, 0, 0]}
]
}
}
3 changes: 3 additions & 0 deletions ...w/floating-ground-edge-case/floating-ground-no-error/delta-wye_n/asym_output.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions ...data/power_flow/floating-ground-edge-case/floating-ground-no-error/delta-wye_n/input.json
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{
"version": "1.0",
"type": "input",
"is_batch": false,
"attributes": {},
"data": {
"node": [
{"id": 1, "u_rated": 10000},
{"id": 2, "u_rated": 100}
],
"transformer": [
{"id": 4, "from_node": 1, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 10000, "u2": 100, "sn": 100000, "uk": 0.10000000000000001, "pk": 1000, "i0": 0.001, "p0": 10, "winding_from": 2, "winding_to": 1, "clock": 1, "tap_side": 0, "tap_pos": 0, "tap_min": -10, "tap_max": 10, "tap_nom": 0, "tap_size": 100, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0}
],
"source": [
{"id": 3, "node": 1, "status": 1, "u_ref": 1, "sk": 1000000000000000, "rx_ratio": 1, "z01_ratio": 2}
],
"asym_load": [
{"id": 21, "node": 2, "status": 0, "type": 0, "p_specified": [1000, 1000, 2000], "q_specified": [1000, 1000, 2000]}
]
}
}
3 changes: 3 additions & 0 deletions ...er_flow/floating-ground-edge-case/floating-ground-no-error/delta-wye_n/input.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
5 changes: 5 additions & 0 deletions ...ata/power_flow/floating-ground-edge-case/floating-ground-no-error/delta-wye_n/params.json
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{
"calculation_method": "newton_raphson",
"rtol": 1e-08,
"atol": 1e-08
}
3 changes: 3 additions & 0 deletions ...r_flow/floating-ground-edge-case/floating-ground-no-error/delta-wye_n/params.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
7 changes: 7 additions & 0 deletions ...ta/power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye/asym_output.json
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{
"version": "1.0",
"type": "asym_output",
"is_batch": false,
"attributes": {},
"data": {}
}
3 changes: 3 additions & 0 deletions ..._flow/floating-ground-edge-case/floating-ground-no-error/wye-wye/asym_output.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions tests/data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye/input.json
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{
"version": "1.0",
"type": "input",
"is_batch": false,
"attributes": {},
"data": {
"node": [
{"id": 1, "u_rated": 10000},
{"id": 2, "u_rated": 100}
],
"transformer": [
{"id": 4, "from_node": 1, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 10000, "u2": 100, "sn": 100000, "uk": 0.10000000000000001, "pk": 1000, "i0": 0.001, "p0": 10, "winding_from": 0, "winding_to": 0, "clock": 0, "tap_side": 0, "tap_pos": 0, "tap_min": -10, "tap_max": 10, "tap_nom": 0, "tap_size": 100, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0}
],
"source": [
{"id": 3, "node": 1, "status": 1, "u_ref": 1, "sk": 1000000000000000, "rx_ratio": 1, "z01_ratio": 2}
],
"asym_load": [
{"id": 21, "node": 2, "status": 0, "type": 0, "p_specified": [1000, 1000, 2000], "q_specified": [1000, 1000, 2000]}
]
}
}
3 changes: 3 additions & 0 deletions .../power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye/input.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
9 changes: 9 additions & 0 deletions tests/data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye/params.json
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{
"calculation_method": "newton_raphson",
"rtol": 1e-08,
"atol": 1e-08,
"xfail": {
"raises": "IterationDiverge",
"reason": "Not possible to converge on loaded floating ground"
}
}
3 changes: 3 additions & 0 deletions ...power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye/params.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
7 changes: 7 additions & 0 deletions .../power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye_n/asym_output.json
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{
"version": "1.0",
"type": "asym_output",
"is_batch": false,
"attributes": {},
"data": {}
}
3 changes: 3 additions & 0 deletions ...low/floating-ground-edge-case/floating-ground-no-error/wye-wye_n/asym_output.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions ...s/data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye_n/input.json
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{
"version": "1.0",
"type": "input",
"is_batch": false,
"attributes": {},
"data": {
"node": [
{"id": 1, "u_rated": 10000},
{"id": 2, "u_rated": 100}
],
"transformer": [
{"id": 4, "from_node": 1, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 10000, "u2": 100, "sn": 100000, "uk": 0.10000000000000001, "pk": 1000, "i0": 0.001, "p0": 10, "winding_from": 0, "winding_to": 1, "clock": 0, "tap_side": 0, "tap_pos": 0, "tap_min": -10, "tap_max": 10, "tap_nom": 0, "tap_size": 100, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0}
],
"source": [
{"id": 3, "node": 1, "status": 1, "u_ref": 1, "sk": 1000000000000000, "rx_ratio": 1, "z01_ratio": 2}
],
"asym_load": [
{"id": 21, "node": 2, "status": 0, "type": 0, "p_specified": [1000, 1000, 2000], "q_specified": [1000, 1000, 2000]}
]
}
}
3 changes: 3 additions & 0 deletions ...ower_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye_n/input.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
9 changes: 9 additions & 0 deletions .../data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye_n/params.json
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{
"calculation_method": "newton_raphson",
"rtol": 1e-08,
"atol": 1e-08,
"xfail": {
"raises": "IterationDiverge",
"reason": "Not possible to converge on loaded floating ground"
}
}
3 changes: 3 additions & 0 deletions ...wer_flow/floating-ground-edge-case/floating-ground-no-error/wye-wye_n/params.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
7 changes: 7 additions & 0 deletions ...ower_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-delta/asym_output.json
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{
"version": "1.0",
"type": "asym_output",
"is_batch": false,
"attributes": {},
"data": {}
}
3 changes: 3 additions & 0 deletions ...w/floating-ground-edge-case/floating-ground-no-error/wye_n-delta/asym_output.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions ...data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-delta/input.json
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{
"version": "1.0",
"type": "input",
"is_batch": false,
"attributes": {},
"data": {
"node": [
{"id": 1, "u_rated": 10000},
{"id": 2, "u_rated": 100}
],
"transformer": [
{"id": 4, "from_node": 1, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 10000, "u2": 100, "sn": 100000, "uk": 0.10000000000000001, "pk": 1000, "i0": 0.001, "p0": 10, "winding_from": 1, "winding_to": 2, "clock": 1, "tap_side": 0, "tap_pos": 0, "tap_min": -10, "tap_max": 10, "tap_nom": 0, "tap_size": 100, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0}
],
"source": [
{"id": 3, "node": 1, "status": 1, "u_ref": 1, "sk": 1000000000000000, "rx_ratio": 1, "z01_ratio": 2}
],
"asym_load": [
{"id": 21, "node": 2, "status": 0, "type": 0, "p_specified": [1000, 1000, 2000], "q_specified": [1000, 1000, 2000]}
]
}
}
3 changes: 3 additions & 0 deletions ...er_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-delta/input.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
9 changes: 9 additions & 0 deletions ...ata/power_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-delta/params.json
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{
"calculation_method": "newton_raphson",
"rtol": 1e-08,
"atol": 1e-08,
"xfail": {
"raises": "IterationDiverge",
"reason": "Not possible to converge on loaded floating ground"
}
}
3 changes: 3 additions & 0 deletions ...r_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-delta/params.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
7 changes: 7 additions & 0 deletions .../power_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-wye/asym_output.json
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{
"version": "1.0",
"type": "asym_output",
"is_batch": false,
"attributes": {},
"data": {}
}
3 changes: 3 additions & 0 deletions ...low/floating-ground-edge-case/floating-ground-no-error/wye_n-wye/asym_output.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions ...s/data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-wye/input.json
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{
"version": "1.0",
"type": "input",
"is_batch": false,
"attributes": {},
"data": {
"node": [
{"id": 1, "u_rated": 10000},
{"id": 2, "u_rated": 100}
],
"transformer": [
{"id": 4, "from_node": 1, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 10000, "u2": 100, "sn": 100000, "uk": 0.10000000000000001, "pk": 1000, "i0": 0.001, "p0": 10, "winding_from": 1, "winding_to": 0, "clock": 0, "tap_side": 0, "tap_pos": 0, "tap_min": -10, "tap_max": 10, "tap_nom": 0, "tap_size": 100, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0}
],
"source": [
{"id": 3, "node": 1, "status": 1, "u_ref": 1, "sk": 1000000000000000, "rx_ratio": 1, "z01_ratio": 2}
],
"asym_load": [
{"id": 21, "node": 2, "status": 0, "type": 0, "p_specified": [1000, 1000, 2000], "q_specified": [1000, 1000, 2000]}
]
}
}
3 changes: 3 additions & 0 deletions ...ower_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-wye/input.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
9 changes: 9 additions & 0 deletions .../data/power_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-wye/params.json
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{
"calculation_method": "newton_raphson",
"rtol": 1e-08,
"atol": 1e-08,
"xfail": {
"raises": "IterationDiverge",
"reason": "Not possible to converge on loaded floating ground"
}
}
3 changes: 3 additions & 0 deletions ...wer_flow/floating-ground-edge-case/floating-ground-no-error/wye_n-wye/params.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions ..._flow/floating-ground-edge-case/non-floating-ground-no-error/delta-wye_n/asym_output.json
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{
"version": "1.0",
"type": "asym_output",
"is_batch": false,
"attributes": {},
"data": {
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3 changes: 3 additions & 0 deletions ...oating-ground-edge-case/non-floating-ground-no-error/delta-wye_n/asym_output.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
21 changes: 21 additions & 0 deletions .../power_flow/floating-ground-edge-case/non-floating-ground-no-error/delta-wye_n/input.json
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3 changes: 3 additions & 0 deletions ...low/floating-ground-edge-case/non-floating-ground-no-error/delta-wye_n/input.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
5 changes: 5 additions & 0 deletions ...power_flow/floating-ground-edge-case/non-floating-ground-no-error/delta-wye_n/params.json
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{
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"atol": 1e-08
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3 changes: 3 additions & 0 deletions ...ow/floating-ground-edge-case/non-floating-ground-no-error/delta-wye_n/params.json.license
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SPDX-FileCopyrightText: Contributors to the Power Grid Model project <[email protected]>

SPDX-License-Identifier: MPL-2.0
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