Fix default capacity in unit cap cons

src/constraints/constraint_unit_flow_capacity.jl

@@ -72,7 +72,7 @@ function add_constraint_unit_flow_capacity!(m::Model)
     )
 end
 
-function _nt(u, ng, d, s, t0, t, default=Inf)
+function _nt(u, ng, d, s, t0, t, default=nothing)
     (unit=u, node=ng, direction=d, stochastic_scenario=s, analysis_time=t0, t=t, _default=default)
 end
 
@@ -81,32 +81,30 @@ function _flow_upper_bound(u, ng, d, s, t0, t_flow)
 end
 
 function _max_startup_ramp(u, ng, d, s, t0, t_on)
-    max_shutdown_ramp[_nt(u, ng, d, s, t0, t_on)]
+    max_shutdown_ramp[_nt(u, ng, d, s, t0, t_on, Inf)]
 end
 
 function _max_shutdown_ramp(u, ng, d, s, t0, t_on)
-    max_shutdown_ramp[_nt(u, ng, d, s, t0, t_on)]
+    max_shutdown_ramp[_nt(u, ng, d, s, t0, t_on, Inf)]
 end
 
-_max_finite(args...) = max((a for a in args if isfinite(a))...)
-
 function _shutdown_margin(u, ng, d, s, t0, t_flow, t_on, case, part)
     if part == 1
         # (F - SD)
-        _max_finite(_flow_upper_bound(u, ng, d, s, t0, t_flow) - _max_shutdown_ramp(u, ng, d, s, t0, t_on), 0)
+        max(_flow_upper_bound(u, ng, d, s, t0, t_flow) - _max_shutdown_ramp(u, ng, d, s, t0, t_on), 0)
     else
         # max(SU - SD, 0)
-        _max_finite(_max_startup_ramp(u, ng, d, s, t0, t_on) - _max_shutdown_ramp(u, ng, d, s, t0, t_on), 0)
+        max(_max_startup_ramp(u, ng, d, s, t0, t_on) - _max_shutdown_ramp(u, ng, d, s, t0, t_on), 0)
     end
 end
 
 function _startup_margin(u, ng, d, s, t0, t_flow, t_on, case, part)
     if case == 2 && part == 1
         # max(SD - SU, 0)
-        _max_finite(_max_shutdown_ramp(u, ng, d, s, t0, t_on) - _max_startup_ramp(u, ng, d, s, t0, t_on), 0)
+        max(_max_shutdown_ramp(u, ng, d, s, t0, t_on) - _max_startup_ramp(u, ng, d, s, t0, t_on), 0)
     else
         # (F - SU)
-        _max_finite(_flow_upper_bound(u, ng, d, s, t0, t_flow) - _max_startup_ramp(u, ng, d, s, t0, t_on), 0)
+        max(_flow_upper_bound(u, ng, d, s, t0, t_flow) - _max_startup_ramp(u, ng, d, s, t0, t_on), 0)
     end
 end