From 9322f90318cac0584dad44144a423aa95abd3dcd Mon Sep 17 00:00:00 2001
From: lisazeyen <lisa.zeyen@web.de>
Date: Tue, 12 Apr 2022 10:03:04 +0200
Subject: [PATCH] add minimum capacity for AC and DC lines depending on
 previous year

---
 scripts/add_brownfield.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/add_brownfield.py b/scripts/add_brownfield.py
index 23ef1352..d7418a79 100644
--- a/scripts/add_brownfield.py
+++ b/scripts/add_brownfield.py
@@ -19,6 +19,11 @@ def add_brownfield(n, n_p, year):
 
     print("adding brownfield")
 
+    # electric transmission grid set optimised capacities of previous as minimum
+    n.lines.s_nom_min = n_p.lines.s_nom_opt
+    dc_i = n.links[n.links.carrier=="DC"].index
+    n.links.loc[dc_i, "p_nom_min"] = n_p.links.loc[dc_i, "p_nom_opt"]
+
     for c in n_p.iterate_components(["Link", "Generator", "Store"]):
 
         attr = "e" if c.name == "Store" else "p"
@@ -103,6 +108,7 @@ def add_brownfield(n, n_p, year):
             n.links.loc[new_pipes, "p_nom_min"] = 0.
 
 
+
 #%%
 if __name__ == "__main__":
     if 'snakemake' not in globals():