: Public <<Narrative>> Narrative
Created: 08/03/2018 11:35:27
Modified: 19/03/2018 17:49:32
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Notes: The efficient use of flexibility services requires increased data flows between TSO and DSO, including for Operational Planning purposes. In this BUC, the focus is on short-term operational planning, starting 72 hours ahead until day-ahead.<br/><br/>For TSO 72-ahead operational planning, forecast of load, Distributed Energy Resources (DER) and flexibility resources both on its own and DSO network is essential for an efficient and secure operation of the bulk power system. In this BUC, it is analyzed the sharing of DSO forecasting results to TSO to enhance its Operational Planning.<br/><br/>DSO can forecast its load per distribution grid node and can aggregate it in a properly manner. Having the forecasted information aggregated per distribution grid node that is monitored by TSO (i.e., aggregated by distribution node on TSO observability area, Fig. 1), has a great potential to enhance TSO operational planning activities.<br/><br/>DSO can also forecast DER and/or flexibility resources and provide this information to TSO following the same rational for the load regarding aggregation level. Disaggregating this information per technology type (wind, PV, hydro, CHP, etc.), allows TSO having a better coordination of generation sources, thus increasing the security of supply and effectiveness of congestion management procedures.<br/><br/><a href="file://D:\EDF\Projetos\17_TDx\WP1\D1.2\UseCases\UC_TDX\DOCs_Support\BUC7_Fig1.png"><font color="#0000ff"><u>Ctrl+click to see the image</u></font></a> <br/><font color="#44546a">Fig. 1 - Load and DER foreseen values that DSO can send TSO to operational planning purposes. The values should be aggregated by technology type and per node belonging to the common observability area</font><br/><br/>Nowadays, there are DRES still under incentive mechanisms (e.g. feed-in tariff), while other may be exposed to the participation in wholesale markets. For the former case, energy produced by DER has higher priority in generation dispatch, therefore it is always dispatched, except if there is a security issue on the grid imposing DRES curtailment. For this case, forecast is based only on the forecasted availability of the primary source.<br/><br/>If a DRES participates in wholesale markets, besides the availability of the primary source, market forecast is also needed. For this case, 72-ahead forecasting of market results are also necessary for operational planning purposes.<br/><br/><a href="file://D:\EDF\Projetos\17_TDx\WP1\D1.2\UseCases\UC_TDX\DOCs_Support\BUC7_Fig2.png"><font color="#0000ff"><u>Ctrl+click to see the image</u></font></a> <br/><font color="#44546a">Fig. 2 – Forecasting data exchange period between TSO and DSO for operational planning purposes</font><br/><br/>As the forecasting accuracy increases with the decrease of time to the planned instant, there is a need to keep exchanging data inside the 72 hour-ahead timeframe. Besides this, both for the load and DRES under market environment, if applied, gate-closure market results can be considered in network operational planning. Therefore, the last time that the information is exchanged between TSO and DSO for operational planning purposes is 24-hours ahead of application period. In the end, information is exchanged between TSO and DSO each 24 hours and always considering the following three days as Fig. 2 suggests.<br/><br/>Under the scope of this BUC, operational planning is also enhanced through an enlarged common observability area (depicted in Fig. 1) of the electrical grid. As distribution grids get increasingly meshed, improving security of supply, it is important for TSO to have visibility over the foreseen status of possible distribution grid loops. These distribution network loops, close to TSO-DSO interface, may have a significant impact on transmission network power flows. Therefore, the visibility over the foreseen connectivity status by DSO, scheduled maintenance actions and electrical characteristics of possible loops in distribution network near TSO-DSO border are of great importance for TSO operational planning.<br/><br/>For example, in Fig. 3 it is represented a distribution line connecting two TSO-DSO interface substations, allowing network loops through distribution network. The foreseen state of this distribution line by DSO can be sent to TSO each 24 hours within a 72-hours ahead timeframe for operation planning purposes.<br/><br/><a href="file://D:\EDF\Projetos\17_TDx\WP1\D1.2\UseCases\UC_TDX\DOCs_Support\BUC7_Fig3.png"><font color="#0000ff"><u>Ctrl+click to see the image</u></font></a> <br/><font color="#44546a">Fig. 3 – Distribution line connecting two substations at TSO-DSO interface, allowing network loops through distribution grid</font><br/><br/>On other hand, for better management of distribution network loops and load transfers by DSOs, TSOs can share the connectivity status and electrical characteristics of the transmission lines connecting two or more transmission substations that have greater potential to affect DSO networks. An example of a branch that can have a significant contribution for distribution grid’s power flow is represented in Fig. 4.<br/><br/><a href="file://D:\EDF\Projetos\17_TDx\WP1\D1.2\UseCases\UC_TDX\DOCs_Support\BUC7_Fig4.png"><font color="#0000ff"><u>Ctrl+click to see the image</u></font></a> <br/><font color="#44546a">Fig. 4 - Transmission line connecting two substations at TSO-DSO interface, with potential impact on distribution network power flows</font><br/>By exchanging foreseen connection status of grid branches, TSOs and DSOs are effectively forming a common observability area that can be used for operational planning purposes. Fig. 1 shows this common observability area concept. Although, out of scope of current BUC, this common observability area data can also be used in real-time power system supervision and control, therefore, there is a connection to “Real-time supervision” BUC.<br/>
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Notes: Coordination of operational planning activities between TSO and DSO up to 72 hours ahead.<br/>
Object Type Connection Direction Notes
«BUC» Coordination of operational planning activities between TSO and DSO BusinessUseCase Dependency From