Integrated heat storage and e-conversion asset

[FJanssen-TNO]

Create an integrated heat storage asset that can be charged using electricity.
Using a heatbuffer with an additional electricity port.

ToDo:

• Add a new component called heat_buffer_elec that is a sub-component of heat_buffer. It can only be charge by electricity and discharge to the connecte heat network.
• Parse chargeEfficiency attribute from esdl to define the efficiency of conversion of electricty to heat.
• Add a new test to check the functionalities of the new component (i.e. buffer can only be charge by electricity, only be discharged to heat network, chargeEfficiency attribute works well,...) Adapt utils_Test to this new asset.
• ChangeLog update

Note:

• Currently, maximum capacity of the electricity power is set equal to the maximum charging power of the buffer by heat network.

[tolga-akan]

@FJanssen-TNO Ready for review

[FJanssen-TNO]

Few final comments.