Jd/fixes area balancing models

src/core/parameters.jl

@@ -6,6 +6,7 @@
     name::String
     multiplier_id::Base.RefValue{Int}
     component_name_to_ts_uuid::Dict{String, String}
+    subsystem::Base.RefValue{String}
 end
 
 function TimeSeriesAttributes(
@@ -18,6 +19,7 @@
         name,
         Base.RefValue{Int}(multiplier_id),
         component_name_to_ts_uuid,
+        Base.RefValue{String}(""),
     )
 end
 
@@ -29,6 +31,13 @@
     return
 end
 
+get_subsystem(attr::TimeSeriesAttributes) = attr.subsystem[]
+function set_subsystem!(attr::TimeSeriesAttributes, val::String)
+    attr.subsystem[] = val
+    return
+end
+set_subsystem!(::TimeSeriesAttributes, ::Nothing) = nothing
+
 function add_component_name!(attr::TimeSeriesAttributes, name::String, uuid::String)
     if haskey(attr.component_name_to_ts_uuid, name)
         throw(ArgumentError("$name is already stored"))