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Refactor energy constraints to use sum instead of mean (#693)
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* Refactor energy constraints to use sum instead of mean

* Update Norse case study input data

* Update function name for adding energy constraints

* Update concepts aggregation table summary
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@datejada
datejada authored Jul 9, 2024
1 parent ac1f899 commit 28e3b38
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28 changes: 15 additions & 13 deletions docs/src/concepts.md
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Expand Up @@ -125,19 +125,21 @@ Due to the flexible resolution, we must explicitly state how the constraints are

Below is the table outlining the details for each type of constraint. Note _min_ means highest resolution, and _max_ means lowest resolution.

| Name | Variables involved | Parameters involved | Constraint type | Resolution of the constraints | Parameter aggregation |
| --------------------------------------------- | ------------------------------ | ------------------- | --------------- | --------------------------------------------------------------------------- | --------------------- |
| Consumer Balance | inputs, outputs | demand | power | min(incoming flows, outgoing flows) | mean |
| Storage Balance | inputs, outputs, storage level | inflows | energy | max(asset, min(incoming flows, outgoing flows)) | sum |
| Hub Balance | inputs, outputs | - | power | min(incoming flows, outgoing flows) | - |
| Conversion Balance | inputs, outputs | - | energy | max(incoming flows, outgoing flows) | - |
| Producers Capacity Constraints | outputs | production | power | min(outgoing flows) | mean |
| Storage Capacity Constraints (outgoing) | outputs | - | power | min(outgoing flows) | - |
| Conversion Capacity Constraints (outgoing) | outputs | - | power | min(outgoing flows) | - |
| Conversion Capacity Constraints (incoming) | inputs | - | power | min(incoming flows) | - |
| Storage Capacity Constraints (incoming) | inputs | - | power | min(incoming flows) | - |
| Transport Capacity Constraints (upper bounds) | flow | capacity | power | if it connects two hubs or demands then max(hub a,hub b), otherwise its own | mean |
| Transport Capacity Constraints (lower bounds) | flow | capacity | power | if it connects two hubs or demands then max(hub a,hub b), otherwise its own | mean |
| Name | Variables involved | Profile involved | Constraint type | Resolution of the constraints | Profile aggregation |
| --------------------------------------------- | ------------------------------ | ---------------- | --------------- | ---------------------------------------------------------------------------------------- | ------------------- |
| Consumer Balance | inputs, outputs | demand | power | min(incoming flows, outgoing flows) | mean |
| Storage Balance | inputs, outputs, storage level | inflows | energy | max(asset, min(incoming flows, outgoing flows)) | sum |
| Hub Balance | inputs, outputs | - | power | min(incoming flows, outgoing flows) | - |
| Conversion Balance | inputs, outputs | - | energy | max(incoming flows, outgoing flows) | - |
| Producers Capacity Constraints | outputs | availability | power | min(outgoing flows) | mean |
| Storage Capacity Constraints (outgoing) | outputs | - | power | min(outgoing flows) | - |
| Conversion Capacity Constraints (outgoing) | outputs | - | power | min(outgoing flows) | - |
| Conversion Capacity Constraints (incoming) | inputs | - | power | min(incoming flows) | - |
| Storage Capacity Constraints (incoming) | inputs | - | power | min(incoming flows) | - |
| Transport Capacity Constraints (upper bounds) | flow | availability | power | if it connects two hubs or demands then max(hub a,hub b), otherwise its own | mean |
| Transport Capacity Constraints (lower bounds) | flow | availability | power | if it connects two hubs or demands then max(hub a,hub b), otherwise its own | mean |
| Maximum Energy Limits (outgoing) | outputs | max_energy | energy | Determine by timeframe partitions. The default value is for each period in the timeframe | sum |
| Minumum Energy Limits (outgoing) | outputs | min_energy | energy | Determine by timeframe partitions. The default value is for each period in the timeframe | sum |

For this basic example, we can describe the balance and capacity constraints in the model. For the sake of simplicity, we consider only the intra-temporal constraints, the representative period index is dropped from the equations, and there are no investment variables in the equations.

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6 changes: 3 additions & 3 deletions src/constraints/energy.jl
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@@ -1,4 +1,4 @@
export add_storage_constraints!
export add_energy_constraints!

"""
function add_energy_constraints!(model, graph, dataframes)
Expand All @@ -16,7 +16,7 @@ function add_energy_constraints!(model, graph, dataframes)
model,
dataframes[:max_energy_inter_rp].outgoing_flow[row.index] ≤
profile_aggregation(
Statistics.mean,
sum,
graph[row.asset].timeframe_profiles,
:max_energy,
row.periods_block,
Expand All @@ -32,7 +32,7 @@ function add_energy_constraints!(model, graph, dataframes)
model,
dataframes[:min_energy_inter_rp].outgoing_flow[row.index] ≥
profile_aggregation(
Statistics.mean,
sum,
graph[row.asset].timeframe_profiles,
:min_energy,
row.periods_block,
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4 changes: 2 additions & 2 deletions test/inputs/Norse/assets-data.csv
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Expand Up @@ -5,10 +5,10 @@ Asgard_Solar,producer,true,true,true,350,50000,100,0,0,,false,0,0,0,0,false,0,,0
Asgard_E_demand,consumer,true,false,false,0,0,0,0,65787.17792,,false,0,0,0,0,false,0,,0,false,,,
Asgard_CCGT,conversion,true,true,true,650,,500,0,0,,false,0,0,0,0,false,0,,0,false,,,
G_imports,producer,true,false,false,0,0,0,75000,0,,false,0,0,0,0,false,0,,0,false,,,
Midgard_Wind,producer,true,true,true,1300,80000,3,0,0,,true,0,0,0,0,false,0,,0,false,,1e9,
Midgard_Wind,producer,true,true,true,1300,80000,3,0,0,,true,0,0,0,0,false,0,,0,false,,4.5e6,
Midgard_Hydro,storage,true,false,false,1600,0,0,250,0,,true,10000,50000,25000,0,false,0,,0,false,relaxed_binary,,
Midgard_PHS,storage,true,true,true,800,5000,200,350,0,,false,0,0,,1,true,500,1000,100,false,,,
Midgard_Nuclear_SMR,producer,true,true,false,6000,,150,1000,0,,true,0,0,0,0,false,0,,0,false,,,1e6
Midgard_Nuclear_SMR,producer,true,true,false,6000,,150,1000,0,,true,0,0,0,0,false,0,,0,false,,,4.5e3
Midgard_E_imports,producer,true,false,false,0,0,0,500,0,,false,0,0,0,0,false,0,,0,false,,,
Midgard_CCGT,conversion,true,true,true,650,,500,0,0,,false,0,0,0,0,false,0,,0,false,,,
Midgard_E_demand,consumer,true,false,false,0,0,0,0,19604.76443,,false,0,0,0,0,false,0,,0,false,,,
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