calliope-project/calliope

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lblabr

@lblabr

How do i model a battery with an minimal power restriction in timesteps of use ?

bat:
essentials:
name: 'ev_bat'
color: '#00AAAA'
parent: storage
carrier: electricity
constraints:
storage_initial: 0
energy_cap_per_storage_cap_equals: 1

        units_equals: 1
        energy_cap_per_unit: 14800
        energy_cap_min_use: 0.2
        energy_cap_max: 14800  # kW

        storage_cap_per_unit: 14800

        energy_eff: 1  # 0.95 * 0.95 = 0.9025 round trip efficiency
        storage_loss: 0.001  # No loss over time assumed
        lifetime: 25
    costs:
        monetary:
            interest_rate: 0.11

does not work

lblabr

@lblabr

i still playing around with operate mode, does have energy_cap_max at transmission technology any impact an the results ? i does not look like that ...

Fin Christie

@FinChristie

Hi, the help I received here was really helpful last time but unfortunately I have arrived at another issue. My model can run without errors but it isn't really working as I had hoped.

The aim of the model is to simulate the production of Hydrogen using OSW and contains both an electricity and hydrogen demand, however the optimal solution - that the model converges to - seems to be to not to produce any hydrogen at all (neglecting the hydrogen demand)

Fin Christie

@FinChristie

I was wondering if there are any ways to incentivise the production of hydrogen, i.e. allowing the carrier to be sold for profit or by cost-penalising the model for not meeting the Hydrogen demand

Fin Christie

@FinChristie

I should mention that the model contains a ccgt supply that is capable of meeting the electricity demand by itself. The intention for OSW is that it priorities hydrogen production but if there is surplus energy it is sent to the electricity demand.

lblabr

@lblabr

could you share your model ?

Fin Christie

@FinChristie

Here is a link to the project git:

https://github.com/FinChrisite/Green_Hydrogen_Production_Project

The model config files and run script are all contained within the poc_model folder

lblabr

@lblabr

the link does not work

is the rep public ?

you might mail me directly

or lblabr on github

Fin Christie

@FinChristie

Hi, sorry I forgot it was set to private. I have changed it to public

Here is a new link: https://github.com/FinChrisite/Green_Hydrogen_Production_Project

Thanks

Rodrigo Amaro e Silva

@ramaroesilva

hi @lblabr. could you explain better what you mean with "a minimal power restriction in timesteps of use?"

3 replies

i still playing around with operate mode, does have energy_cap_max at transmission technology any impact an the results ? i does not look like that ...

energy_cap_max is not really suited for operate mode, as it limits the maximum capacity the optimization procedure can allocate to a given technology in a given location.

and the "operate" mode does not perform any optimization on the installed capacities, only the "plan" mode

1 reply

hi @FinChrisite, does the html output of your model indicate any unmet hydrogen demand?

Rodrigo Amaro e Silva

@ramaroesilva

if it shows the unmet hydrogen demand, it likely means that the model cannot make the hydrogen reach its consumption point(s) (since the cost for unmet demand is usually huge)

after your reply I might take a deeper look into your repo :-)

Fin Christie

@FinChristie

Hi Rodrigo, yes the html output does show the unmet hydrogen demand. I will send in some screenshots.

Fin Christie

@FinChristie

Rodrigo Amaro e Silva

@ramaroesilva

So, from my experience that usually means that something (usually not money) is blocking the hydrogen from reaching its consumption point(s).

Just to confirm, the public repo you shared here is the one I should look at, right?

lblabr

@lblabr

wich scenario is relevant ? in your model you have two transmission techs for region1-2,region2:

lblabr

@lblabr

moving the electrolysis to the location with OSW and removing transmission for hydrogen results in that picture

in the way around shouldn't be the hydrogen demand in region1-2: ??

moving the hydrogen demand

Fin Christie

@FinChristie

Hi, the link that was causing the problem was the hydrogen pipes between region1-2 and region 2. After looking over it with my supervisor we found the efficiency per distance constraint was effectively making the pipe useless (because of thr long distance). We removed the constraint and it now works as hoped. Thabk you so much for taking a look at the model!

Rodrigo Amaro e Silva

@ramaroesilva

@FinChrisite, great! keep up the good work :-)

Fin Christie

@FinChristie

I also think i have found a bug in the software, I am not sure if you are aware but the "one_way" transmission constraint doesn't seem to work

Rodrigo Amaro e Silva

@ramaroesilva

I've used it before and it does work (at least in version 0.65). what I found out and has already been identified by the main developers, is that one-way is not compatible with transmission costs

Fin Christie

@FinChristie

Ahh interesting!

Rodrigo Amaro e Silva

@ramaroesilva

@lblabr, what's happening here is that your confusing installed capacity with operation power (as both are in Watt).

energy_cap_max/min/equals only address how many kW are installed for a given technology in a given location. that's where my previous comment came from.

in your case, you have a 11 kW battery (rated capacity, fixed value), which can only operate at power levels >= 2.4 kW (power operation, which varies in time) and <= its rated capacity.

This is a pertinent question, which I have yet to address in my projects.

I looked at the per-tech constraints and couldn't find what you're looking for (which does not mean it is not there)

Rodrigo Amaro e Silva

@ramaroesilva

https://calliope.readthedocs.io/en/stable/user/config_defaults.html#per-tech-constraints

lblabr

@lblabr

in your case, you have a 11 kW battery (rated capacity, fixed value), which can only operate at power levels >= 2.4 kW (power operation, which varies in time) and <= its rated capacity.

what do you mean with rated capacity, the capacity of the battery is 13,1kWh

so charging may operate at a power level 2.4kW ... 11kW, charging duration the 13,1kWh depends an Charging level

Rodrigo Amaro e Silva

@ramaroesilva

you're right, I meant "rated power".

lblabr

@lblabr

okay, understud the contraints have a mor or less universal meaning depending on tec

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