1 Introduction
1.1 Motivation
1.2 Core objective and research question
1.3 Applied method
1.4 Structure of the paper
2 State-of-the-art and progress beyond
2.1 About participation and contracts in energy communities
2.2 Stochastic modeling and optimization of energy communities
2.3 Progress beyond state-of-the-art
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To our knowledge, preferences of prosumers to join or leave an energy community as stochastic input are not analyzed in any other paper.
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We consider the medium- to long-term development and stabilization of an energy community. We ask how to assign contracts in energy communities, such that participants are assured that the community is evolving according to their needs, and trust is strengthened.
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Finally, the explicit search for optimal participants for an energy community instead of searching for an optimal technology portfolio, as it is state-of-the-art in most papers, is a prominent aspect of this work. With increasing number of prosumers in the energy system and energy communities as an established instrument, selection of participants will become more and more standard practice.
3 Method
3.1 Overview on the methodology
3.2 Stochastic dynamic program
3.2.1 Upper-level problem
3.2.2 Objective function
3.2.3 Transition function
3.2.4 Lower-level problem
3.2.5 Willingness-to-pay
3.2.6 Community welfare
3.3 Data and assumptions
3.3.1 Model implementation
3.3.2 Parameters of the case study
Annual demand | PV | PV peak | BESS | CO2-price | |
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(kWh) | orientation | (kW) | (kWh) | (EUR/tCO2) | |
Prosumer SH 1 | 3336 | South | 5 | 3 | 100 |
Prosumer SH 2 | 4538 | South | 5 | 0 | 0 |
Prosumer SH 3 | 5253 | – | – | – | 90 |
Prosumer SH 4 | 5824 | South | 3 | 3 | 30 |
Prosumer SH 5 | 6337 | South | 5 | 0 | 50 |
Prosumer SH 6 | 6833 | South | 5 | 3 | 60 |
Prosumer SH 7 | 7346 | – | – | – | 40 |
Prosumer SH 8 | 7917 | South | 3 | 3 | 80 |
Prosumer SH 9 | 8632 | South | 5 | 0 | 20 |
Prosumer SH 10 | 9834 | – | – | – | 100 |
Prosumer SAB 1 | 6258 | South | 8 | 3 | 100 |
Prosumer SAB 2 | 8513 | West | 8 | 0 | 0 |
Prosumer SAB 3 | 9854 | – | – | – | 90 |
Prosumer SAB 4 | 10926 | South | 5 | 3 | 30 |
Prosumer SAB 5 | 11888 | East | 8 | 0 | 50 |
Prosumer SAB 6 | 12820 | West | 8 | 3 | 60 |
Prosumer SAB 7 | 13782 | – | – | – | 40 |
Prosumer SAB 8 | 14854 | South | 5 | 3 | 80 |
Prosumer SME 1 | 16195 | South | 8 | 0 | 10 |
Prosumer SME 2 | 18450 | – | – | – | 20 |
3.4 Scenarios
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\(\omega_{1}\): additional SABs might want to join in the upcoming years
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\(\omega_{2}\): the SABs might want to phase-out in the upcoming years
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\(\omega_{3}\): additional SHs might want to join in the upcoming years
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\(\omega_{4}\): the SHs might want to phase-out in the upcoming years
4 Results
4.1 Selection of new members in year one using a horizon with stochastic forecasts
4.1.1 Original community
Prosumer | SH 1 | SH 2 | SH 3 | SH 6 | SH 7 |
Buying grid (kWh) | 479.5 | 3369.5 | 3961.1 | 2712.2 | 4933.7 |
Selling grid (kWh) | 815.3 | 2857.8 | 0 | 469.9 | 0 |
Battery charging (kWh) | 880.0 | 0 | 0 | 880.0 | 0 |
Battery discharging (kWh) | 747.4 | 0 | 0 | 776.8 | 0 |
Self-consumption (kWh) | 1877.5 | 1099.2 | 0 | 3291.2 | 0 |
Buying community (kWh) | 231.2 | 68.8 | 1291.4 | 53.1 | 2412.5 |
Selling community (kWh) | 2887.9 | 2503.7 | 0 | 1819.6 | 0 |
Emissions (tCO2) | 0.1 | 0.5 | 0.5 | 0.4 | 0.7 |
Costs (EUR) | -531.0 | 78.4 | 1169.6 | 184.5 | 1637.1 |
Prosumer | SAB 3 | SAB 4 | SAB 5 | SAB 7 | SME 1 |
Buying grid (kWh) | 5601.8 | 6984.5 | 7741.2 | 7338.9 | 10452.5 |
Selling grid (kWh) | 0 | 1319.5 | 665.8 | 0 | 1584.0 |
Battery charging (kWh) | 0 | 880.0 | 0 | 0 | 0 |
Battery discharging (kWh) | 0 | 783.0 | 0 | 0 | 0 |
Self-consumption (kWh) | 0 | 3148.5 | 3855.7 | 0 | 5532.1 |
Buying community (kWh) | 4252.5 | 10.0 | 291.4 | 6443.3 | 210.7 |
Selling community (kWh) | 0 | 1112.7 | 3720.0 | 0 | 3221.0 |
Emissions (tCO2) | 0.7 | 0.9 | 1.1 | 1.0 | 1.4 |
Costs (EUR) | 2227.1 | 1249.7 | 910.2 | 3083.2 | 1578.7 |