Test objective name

IncreasedRESSelfConsumption

Author / organization

Benedikt Leitner / AIT

Short description

This test case is used to verify that self-consumption of renewable energy sources in a coupled heat and power network improved using distributed power-to-heat appliances compared to a base scenario without power-to-heat.

Present use / development status

Test objective

verification

Description incl. justification

The test case is used to verify that self-consumption of renewable energy sources in a coupled heat and power network improved using distributed power-to-heat appliances compared to an uncoupled scenario.
This means that energy flows flowing out of the network are reduced. At the same time energy imports should not increase. Relevant effort variables of both networks, i.e., bus voltages, supply temperatures and differential pressures, must stay within the allowable range. Also, the loading of the transformer is not allowed to reach critical levels. Otherwise the test fails.

System configuration

SmartDorf (see deliverable D2-3, Appendix C)

Use case

System Under Test

The entire system depicted in Figure A.1 is the System Under Test, since the behaviour of every single component in this system can affect the Function Under Investigation.
Subsystems:
• Low voltage distribution network
• District heating network
• Power-to-heat appliances

Object Under Investigation

External electric grid
• Power flows to and from
Base district heating boiler
• heat generation
District heating network
• Supply temperatures at substations
• Differential pressures at substations
Low voltage distribution network
• Voltages at consumer connection points

Function Under Investigation

Control function(s) of power-to-heat appliances

Objective Function / Target Metrics

Operation costs for a thermal-electric unit combined with a thermal-storage (see deliverable D4.2, Appendix A.4, page 19):

• Total power flow from external electric grid in MWh
• Total heat flow from base district heating boiler in MWh
• Voltages at consumer connection points in p.u.
• Transformer loading in %
• Differential pressures at substations in bar
• Supply temperatures at substations in °C

Acceptable test result

The power flow to the external grid and the heat flow from the base district heating boiler are reduced compared to a scenario without power-to-heat appliances. Thus, self-consumption of RES is improved. At the same time, the power flow from the external grid is not allowed to increase more than 1%.

Moreover, the following technical criterias must be met:

• Voltages at consumer connection points within 0.95 p.u. and 1.05 p.u. for 99% of time
• Differential pressures at substations within 0.9 bar and 5 bar for 99% of time
• Supply temperatures at substations above 65°C for 99% of time • Transformer loading never goes above 100%