Modeling BESS + Reserve Margin

OSeMOSYS Troubleshooting
1

Hello everyone,

I have completed the OSeMOSYS ‘Flatpack’ and Hands-on 9. I am now developing a national model for an African country and I’m facing an issue with BESS and Reserve Margin (RM).

I have decoupled my storage into two technologies:

  1. BATTPWR (Inverters) at 80 €/kW.

  2. BESS_Cells (Storage) at 300 €/kWh.

Even with these costs, the model installs ‘power-only’ batteries (huge GW of inverters with almost no GWh of cells) just to satisfy the RM requirement at the lowest cost.

Is there a standard way to enforce a fixed Energy-to-Power ratio (e.g., forcing 4 GWh of cells for every 1 GW of inverter). will it be using a User Defined Constraint (UDC)?

Edit : the issue should be somewhere else: if I remove the BESS from the UDC, then the model installs tons of Diesel to cover the RM requirement… (corresponding ridiculous investment appears in the results)

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Thanks for your help!

2

It seems the error was to had modeled this RM through the “UDC M TOTAL Capacity” instead of “UDC Multiplier Activity”

Now it is solved

However I still have too much “BATTPWR” to ‘stabilize’ my grid because I cannot link the BATTPWR to the BATTSTO through an UDC. Is it correct that UDC can only make constraints among technologies, and cannot include ‘Storage’ assets ?

I want to model that for 1GW Inverter I want 4GWh of cell storage. I don’t find how to model that in OSEMOSYS MUIO5.5

Thank you for your help