: Public <<Narrative>> Narrative
Created: 19/09/2018 10:36:29
Modified: 19/09/2018 10:36:29
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Notes: <font color="#0f0f0f">Flexibility services can be used at the electricity market for the three types of actions: </font><br/><font color="#0f0f0f">- portfolio optimisation of market players </font><br/><font color="#0f0f0f">- constraints management in transmission and distribution networks (at day-ahead and intraday markets)</font><br/><font color="#0f0f0f">- balancing to ensure power system security (balancing market). </font><br/><font color="#0f0f0f">Enabling flexibility services must not lead to market fragmentation or competition distortion. However, settlement of constraint management and balancing must be clearly separated. DFR providers must be able to sell their services to both TSOs and DSOs. TSO procures flexibility services, from large industrial consumers or aggregators. DSO procures flexibilities also from aggregators and from several types of DERs (distributed generation, demand response, decentralized storage, electric vehicles) connected to the distribution grid with the purpose to maintain quality of service and the security of supply. DSO can procure flexibility services in long and short timescales. In the present BUC, the timeframes day-ahead and intraday are considered. <b>Coordination between TSO and DSO is needed since the same flexibility resources may be activated for balancing (TSO services) and congestion constraints management (TSO and DSO services) purposes. </b></font><br/><font color="#0f0f0f"><br/><b>Scenario 1:</b> <b>TSO procures the flexibilities and the DSO should validate their activation</b></font><br/><font color="#0f0f0f">DFR are procured by TSO for the purpose of balancing or constraint management in the transmission grid. However, the activation of the flexibilities can jeopardizes the security of supply and reduces quality of services due to, for example, power line congestions, voltage constraints or overload the power transformer at TSO/DSO border. Since the DFR are connected to distribution network, DSO should be asked to validate the DFRs procured by the TSO to avoid constraints in the distribution system.</font><br/><font color="#0f0f0f"><br/><b>Scenario 2:</b> <b>DSO procures the flexibilities and provides the forecasted load/generation by primary substation</b></font><br/><font color="#0f0f0f">DSO can organises a local procurement of flexibilities to prevent the operation constraints in the distribution network. The constraints can be technical (HV/MV power transformer overload, lines congestion, voltage constraints) but also contractual (agreements between TSO/DSO in the TSO/DSO borders). Since the procurement of the DFR will impact the global system operation, the DSO should include the activation of the flexibility offers in the forecasts (load/generation by primary substation) sent to the TSO in day-ahead.</font><br/><font color="#0f0f0f"><br/><b>Scenario 3:</b> <b>Coordination mechanism between local and national market</b></font><br/>The Flexible Operators connected in distribution network should place their offer in a local market and the Flexible Operators connected in the transmission network should place their orders in a national market. The clearing mechanism in local market should provide services for the DSO to solve the distribution network constraints. The offers that are not used in the local market should be technically validated by the DSO and be transferred for the National market. After the clearing process both in local and national markets, the TSO should coordinate the activation of the flexibilities connected in the transmission system and the DSO should coordinate the activation of the flexibilities connected in the distribution network<font color="#0f0f0f">.</font><br/><font color="#0f0f0f"><b><br/>Scenario 4:</b> <b>TSO and DSO procure flexibility in a single flexibility market</b></font><br/><font color="#0f0f0f">To ensure the market liquidity, building a level playing field for different service providers in a single marketplace and to joint procurement of services both for TSOs and DSOs a single procurement system is needed [1]. In this single procurement platform (market) the TSO and the DSOs should include their needs to balancing and congestion management (TSO) and for congestion and voltage management (DSO). It is important to mention that some voltage constraints can appear in distribution network even if a good reactive management is implemented.</font><br/><font color="#0f0f0f"><br/><b>Flexibility platform</b> enables well-structured and organised exchange of data between TSO, DSO and flexibility service provider. <b>DSO should have visibility of aggregated resources in the distribution grid and information about individual activations.</b> This information should be available (day ahead or intraday time frames) to ensure that market schedules are not in the conflict with network operation. </font><br/>
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Notes: - Validation of TSO/DSO coordination mechanism to distributed flexibility resources procurement avoiding double or counter activation of the same flexibility resource by TSO and DSO <br/>- Prevent the negative impact of offers activation in the networks<br/>- Definition of the data that should exchange between the TSO, the DSO and the market operator.<br/>
Object Type Connection Direction Notes
«BUC» Coordination of distributed flexibility resources in a marketplace BusinessUseCase Dependency From