Storage modelling issues

[sanketpuranik]

Hi,

I have been modelling storage with a load to reduce peaks and shift load according to market prices (no capacity optimization). Doing this i have realized few issues with the storage model:

1. C rate parameter doesn't seem to work. I wanted a 100 kWh battery system to have C rate of 0.7. However when i run simulation with defined C rate the result show that the C rate is actually 1! i tried different C rated but the result is always a C rate of 1. so instead i am not using input and output power to define the same.

2. input and output power efficiency not working. After i define these two efficiencies the result show that efficiency is not considered. For example if i set output efficiency of 97% and if outpower is 70kW, i would expect actual output power 3% less than 70 kW. Maybe it is about interpretation, the output power of 70 kW is considereing efficiency losses. But then this has to be clear in documentation on how the losses are accounted in the battery model.

3. finally an open question: is it possible to separately size power capacity (kW) and energy capacity of the storage (kWh)?

I have attached relevant files with the issue (@ciaradunks).

timeseries_all_busses_UC1.xlsx

BESS_CSx.csv
energyStorage.csv

[Bachibouzouk]

@c-moeller I will prepare a usecase on open_plan to test if this is also an issue for us

[Bachibouzouk]

Which version of MVS did you use @sanketpuranik ?
Could you provide the timeseries you used for the sink (if this is fixed demand)? As well as the other csv for the grid
If you use mvs can you run the simulation with the -png option? This will save the built energy system as png in the result folder (sometimes the built energy system is different than the one we thought we were modelling :))