Merge pull request #173 from SciML/bgc/hyd_hardstop

Improvements to DynamicVolume component

Author: YingboMa

src/Blocks/sources.jl

@@ -565,3 +565,5 @@ data input component.
                      defaults = [output.u => get_sampled_data(0.0, buffer)])
 end
 @deprecate Input SampledData
+
+Base.convert(::Type{T}, x::Parameter{T}) where {T <: Real} = x.ref