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Merge pull request #952 from koen-vg/transmission-expansion-limit-reached

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Add check for turning off transmission expnasion if limit reached
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Fabian Neumann 2024-03-11 09:06:08 +01:00 committed by GitHub
commit 0a0a35e4a4
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2 changed files with 49 additions and 19 deletions
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2
doc/release_notes.rst
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@ -104,6 +104,8 @@ Upcoming Release
* Bugfix: allow modelling sector-coupled landlocked regions. (Fixed handling of offshore wind.)
* Adapt the disabling of transmission expansion in myopic foresight optimisations when limit is already reached to also handle cost limits.
PyPSA-Eur 0.10.0 (19th February 2024)
=====================================

66
scripts/add_brownfield.py
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@ -124,29 +124,57 @@ def add_brownfield(n, n_p, year):
n.links.loc[new_pipes, "p_nom_min"] = 0.0
def disable_grid_expansion_if_LV_limit_hit(n):
if "lv_limit" not in n.global_constraints.index:
return
def disable_grid_expansion_if_limit_hit(n):
"""
Check if transmission expansion limit is already reached; then turn off.
total_expansion = (
n.lines.eval("s_nom_min * length").sum()
+ n.links.query("carrier == 'DC'").eval("p_nom_min * length").sum()
).sum()
In particular, this function checks if the total transmission
capital cost or volume implied by s_nom_min and p_nom_min are
numerically close to the respective global limit set in
n.global_constraints. If so, the nominal capacities are set to the
minimum and extendable is turned off; the corresponding global
constraint is then dropped.
"""
cols = {"cost": "capital_cost", "volume": "length"}
for limit_type in ["cost", "volume"]:
glcs = n.global_constraints.query(
f"type == 'transmission_expansion_{limit_type}_limit'"
)
lv_limit = n.global_constraints.at["lv_limit", "constant"]
for name, glc in glcs.iterrows():
total_expansion = (
(
n.lines.query("p_nom_extendable")
.eval(f"s_nom_min * {cols[limit_type]}")
.sum()
)
+ (
n.links.query("carrier == 'DC' and p_nom_extendable")
.eval(f"p_nom_min * {cols[limit_type]}")
.sum()
)
).sum()
# allow small numerical differences
if lv_limit - total_expansion < 1:
logger.info("LV is already reached, disabling expansion and LV limit")
extendable_acs = n.lines.query("s_nom_extendable").index
n.lines.loc[extendable_acs, "s_nom_extendable"] = False
n.lines.loc[extendable_acs, "s_nom"] = n.lines.loc[extendable_acs, "s_nom_min"]
# Allow small numerical differences
if np.abs(glc.constant - total_expansion) / glc.constant < 1e-6:
logger.info(
f"Transmission expansion {limit_type} is already reached, disabling expansion and limit"
)
extendable_acs = n.lines.query("s_nom_extendable").index
n.lines.loc[extendable_acs, "s_nom_extendable"] = False
n.lines.loc[extendable_acs, "s_nom"] = n.lines.loc[
extendable_acs, "s_nom_min"
]
extendable_dcs = n.links.query("carrier == 'DC' and p_nom_extendable").index
n.links.loc[extendable_dcs, "p_nom_extendable"] = False
n.links.loc[extendable_dcs, "p_nom"] = n.links.loc[extendable_dcs, "p_nom_min"]
extendable_dcs = n.links.query(
"carrier == 'DC' and p_nom_extendable"
).index
n.links.loc[extendable_dcs, "p_nom_extendable"] = False
n.links.loc[extendable_dcs, "p_nom"] = n.links.loc[
extendable_dcs, "p_nom_min"
]
n.global_constraints.drop("lv_limit", inplace=True)
n.global_constraints.drop(name, inplace=True)
def adjust_renewable_profiles(n, input_profiles, params, year):
@ -233,7 +261,7 @@ if __name__ == "__main__":
add_brownfield(n, n_p, year)
disable_grid_expansion_if_LV_limit_hit(n)
disable_grid_expansion_if_limit_hit(n)
n.meta = dict(snakemake.config, **dict(wildcards=dict(snakemake.wildcards)))
n.export_to_netcdf(snakemake.output[0])