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Methods to include dynamic line rating in our model. | ||
==================================================== | ||
Methods to include dynamic line rating in our model | ||
==================================================== | ||
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To calculate the transmission capacity of each transmission line in the model, | ||
the procedure suggested in the **Principles for the Expansion Planning of the | ||
German Transmission Network** [NEP2021] where used: | ||
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1. Import the temperature and wind temporal raster layers from ERA-5. Hourly | ||
resolution data from the year 2011 was used. Raster resolution | ||
latitude-longitude grids at 0.25° x 0.25°. | ||
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2. Import shape file for the 9 regions proposed by the Principles for | ||
the Expansion Planning. See Figure 1. | ||
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.. image:: images/regions_DLR.png | ||
:width: 400 | ||
:alt: regions DLR | ||
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Figure 1: Representative regions in Germany for DLR analysis [NEP2021] | ||
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3. Find the lowest wind speed in each region. To perform this, for each | ||
independent region, the wind speed of every cell in the raster layer should be | ||
extracted and compared. This procedure is repeated for each hour in the | ||
year 2011. The results are the 8760 lowest wind speed per region. | ||
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4. Find the highest temperature in each region. To perform this, for each | ||
independent region, the temperature of every cell in the raster layer should | ||
be extracted and compared. This procedure is repeated for each hour in the | ||
year 2011. The results are the 8760 maximum temperature per region. | ||
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5. Calculate the maximum capacity for each region using the parameters shown in | ||
Figure 2. | ||
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.. image:: images/table_max_capacity_DLR.png | ||
:width: 400 | ||
:alt: table_max_capacity_DLR | ||
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Figure 2: transmission capacity based on max temperature and min wind speed [NEP2021] | ||
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6. Assign the maximum capacity of the corresponding region to each transmission | ||
line inside each one of them. Crossborder lines and underground lines receive | ||
no values. It means that their capacities are static and equal to their nominal | ||
values. Lines that cross borders between regions receive the lowest | ||
capacity per hour of the regions containing the line. | ||
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.. [NEP2021] Principles for the Expansion Planning of the German Transmission Network https://www.netzentwicklungsplan.de/ |
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Information about batteries in our system. | ||
Battery storage units comprise home batteries and larger, grid-supportive batteries. National capacities for home batteries arise from external sources, e.g. the Grid Development Plan for the scenario ``eGon2035``, whereas the capacities of large-scale batteries are a result of the grid optimization tool `eTraGo <https://github.com/openego/eTraGo>`_. | ||
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Home battery capacities are first distributed to medium-voltage grid districts (MVGD) and based on that further disaggregated to single buildings. The distribution on MVGD level is done proportional to the installed capacities of solar rooftop power plants, assuming that they are used as solar home storage. | ||
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Potential large-scale batteries are included in the data model at every substation. The data model includes technical and economic parameters, such as efficiencies and investment costs. The energy-to-power ratio is set to a fixed value of 6 hours. Other central parameters are given in the following table | ||
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.. list-table:: Parameters of batteries for scenario eGon2035 | ||
:widths: 40 30 30 | ||
:header-rows: 1 | ||
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* - | ||
- Value | ||
- Sources | ||
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* - Efficiency store | ||
- 98 % | ||
- [DAE_store]_ | ||
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* - Efficiency dispatch | ||
- 98 % | ||
- [DAE_store]_ | ||
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* - Standing loss | ||
- 0 % | ||
- [DAE_store]_ | ||
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* - Investment costs | ||
- 838 €/kW | ||
- [DAE_store]_ | ||
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* - Home storage units | ||
- 16.8 GW | ||
- [NEP2021]_ | ||
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On transmission grid level, distinguishing between home batteries and large-scale batteries was not possible. Therefore, the capacities of home batteries were set as a lower boundary of the large-scale battery capacities. | ||
This is implemented in the dataset :py:class:`StorageEtrago <egon.data.datasets.storages_etrago.StorageEtrago>`, the data for batteries in the transmission grid is stored in the database table :py:class:`grid.egon_etrago_storage <egon.data.datasets.etrago_setup.EgonPfHvStorage>`. |
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