TSO/DSO interface



While first deliveries of SmartGrid demonstrations have been made on key projects such as NiceGrid, Venteea and SmartGrid Vendée in France or Nevada Energy Demand Response and Duke DOE Integrated Smart Distribution in the US, new layered control architectures are emerging illustrating the growing need to manage coordinated controls across Distributed Energy Resources (DG, DR, ES and EV)* portfolio owners, Grid Operators (Transmission and Distribution) and deregulated energy supply companies.
This naturally opens the question of the new roles of each energy stakeholder’s in the future smart energy system value chain as illustrated in the papers published by the Expert Group 2 of the European Commission SmartGrid Task force on future DSO roles. Those new roles will then re-define the data to be exchanged between the various stakeholders and impact the underlying ICT architectures, requiring to firstly revisit the usual application footprint used by TSOs and DSOs to manage their Grid operations and secondly to make evolve interactions andinterfaces between them.
The working group will investigate these new trends through European experiences in a first stage as well as other international experiences later
(*) DER encompasses DG (Distributed Generation), DR (Demand Response), ES (Energy Storage), EV (Electrical Vehicle)


Our analysis will focus on the 3 following inter-dependent levels:
1. Identify the key Use Cases associated with TSO-DSO Data exchanges as well as necessary interfaces
2. Synthetize the various options for energy stakeholder roles (focusing on TSO/DSOs particularly). We propose to consider it in the prospective of the role model established as part of the ETSI-CEN-CENELEC standardization committee according to the Smart Grid Architecture Model (SGAM).
3. Define the associated Technical architecture (ICT architectures / Interfaces) (mapping them to the SGAM and suitable standards if any)
We propose to base the working group effort on European Smartgrid project experiences (reusing documents available within key associations such as EDSO, ENTSOe as well as GSGF), and adopt the following steps:
1. Confirm the list of key SmartGrid usecases requiring TSO-DSO coordination, particularly focusing on challenges related to DER introduction into the energy system.
We will start by listing the activities to be undertaken in order to operate Energy Systems with high penetration of DER:
a. Network “Real-Time” Operations: Network Stability (frequency), Voltage Regulation, Switching Orders, Outage/Fault Management, etc.
b. Generation/Load Scheduling: Schedule Preparation, Balancing Market, Flexibility Market, Capacity Market, etc.

2. Map the Usecase list with the roles of the various stakeholders
As a second step we will map the usecase list with the roles of the stakeholders by identifying for each usecase, the responsibility (potentially several alternatives) of the various stakeholders involved in energy value chain (TSO, DSO, Prosumers, Aggregators, Regulators, Market Players, DG Producers, etc.). We will primarily focus on TSO and DSO roles even though the roles of the other stakeholders cannot be totally avoided as there are all inter-dependent.
3. Define the associated Reference architecture
Considering the SGAM as a reference, we will determine the high level requirements for the underlying ICT technology to support exchanges between TSO and DSO leveraging standards from the ETSI-CEN-CENELEC working group.
4. Define Data Flows between TSO & DSO
Based on the role definition and the associated IT architecture, we will identify the main data flows to be implemented between TSO & DSO.

Convener :
Laurent Schmitt, Alstom, France

Members :            

Amezua Aitor, ORMAZABAL, Spain
Belhomme Régine, EDF R&D, FranceUniversity, China
Berge Øystein Randal, BKK Nett, Norway
Davidson Euan, Smarter Grid Solutions, United Kingdom
Grenard Sébastien, ERDF, France
Kockar Ivana, University of Strathclyde, United Kingdom
Liu Junyong, Sichuan 
Louro Miguel, EDP, Portugal
Olivier Ratel, ICELEC, France
Pedersen Jan, Agder Energi, Norway
Poulain Louis, ALSTOM, France
Sandulli Domenico, ACEA, Italy
Taylor Jason, EPRI, U.S.A.
Wright John ALSTOM United Kingdom