[Priority] Implement net-zero community + KPIs

[ursulaelmir]

Deadline: 28-08-2020 + 2 days testing

• Add constraint: Net-zero energy community
  or
• Add constraint: Renewable share

Ensure calculation of KPIs:

• RE share
• Asset costs
• NPV
• LCOE
• Degree of autonomy or hours operating without dso
• CO2 emissions
• IRR / ROI (ROE) – UEM research + issue

Other:

• Determine weighting factor for heat (either 1 kWh_therm ~ 1 kWh_eleq = 1 kWh_el or something like 4 kWh_therm ~ 1 kWh_eleq, but that rather describes exergy)

[smartie2076]

Issue connected to #133 (constraints) and #223, #222 (KPI).

@ursulaelmir can you outline the definition for the net-zero energy constraint so that I can copy and paste it into an .rst file when I create the PR? Also we make sure that way that I am inplementing what you had in mind.
I was thinking of:

\sum E_{feedin, DSO, i} -  E_{consumption, DSO, i} >= 0

This could be calculated per energy vector and/or for the whole system. What is your take?

Also, there are two ways to implement the co2 emission evaluation:
(1) Add it as oemof-solph inbuild parameter emissions to each of our assets in D2, which enables us to easily add an emission_limit for a constraint on CO2 emissions
(2) Add CO2 emissions as a post-processing KPI that is only calculated from our annual energy flows.

[ursulaelmir]

@smartie2076 the definition for net zero energy building or community says that the building or community produces enough renewable energy to meet its own annual energy demand. @SabineHaas could you maybe elaborate on the definition that you have defined for the GRECO project?

[smartie2076]

Most economic KPI are now displayed in the report. They can also be found in the json file (end of file).

The renewable share does not have a benchmark test, but a unit test.

@ursulaelmir please let me know if the report works for you for sector-coupled systems!

[smartie2076]

@ursulaelmir I think it would be best to leave the CO2 emissions at the side for now. You can calculate the emissions yourself easily with the DSO and gas/diesel consumption, but it would be quite elaborate to add the calculation to the MVS.

[smartie2076]

Regarding the weighting factor for heat: I would probably just go with 1 kWh_therm ~ 1 kWh_eleq ~ 1 kWh_el for now, as anything else would be hard to cite right now. If you find anything on this, it can be easily changed (also quickly after your 90% deadline).

[ursulaelmir]

hi @smartie2076 , just a tiny note that I would like to review later on regarding the RE share for hydrogen in my current simulations.
When the electrolyzer installed capacity is 0 and optimisation is run, the RE share for hydrogen is 10 and when the pre-installed capacity is 100, the RE share for hydrogen is 0 while only the electrolyzer is being used and the reformer is not used at all. Is it because it is a pre-installed capacity and the RE share is calculated on the optimisation capacities?

[smartie2076]

hi @smartie2076 , just a tiny note that I would like to review later on regarding the RE share for hydrogen in my current simulations.
When the electrolyzer installed capacity is 0 and optimisation is run, the RE share for hydrogen is 10 and when the pre-installed capacity is 100, the RE share for hydrogen is 0 while only the electrolyzer is being used and the reformer is not used at all. Is it because it is a pre-installed capacity and the RE share is calculated on the optimisation capacities?

Uh-ohhh... No, that should definitely not happen. RE share is calculated from the total flows of the assets, not the capacities, so the resulting share for the same capacity (pre-installed + additional) should be equal. Also, 10 seems a bit weird, eventhough I suppose RE share could be > 1 as there is a transformer efficiency in between the electricity and H2 bus...

can you upload the input folders on the server and send me a link to them?

[SabineHaas]

@smartie2076 the definition for net zero energy building or community says that the building or community produces enough renewable energy to meet its own annual energy demand. @SabineHaas could you maybe elaborate on the definition that you have defined for the GRECO project?

@ursulaelmir this is exactly how we define NZE buildings/communities. Or as expressed further above in a formula:

\sum E_{feedin, DSO, i} - E_{consumption, DSO, i} >= 0

[smartie2076]

The requirements for finishing @ursulaelmir´s thesis were met. Other todos are now managed in #592