UMBRELLA

"Toolbox for Common Forecasting, Risk assessment, and Operational Optimisation in Grid Security Cooperations of Transmission System Operators (TSOs)"

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 Obiettivo del progetto (Objective)

'The growing share of electricity generation from intermittent renewable energy sources as well as increasing market-based cross border flows and related physical flows are leading to rising uncertainties in transmission network operation. In the mainland central Europe synchronous area due to large installations of renewable energy generation such as wind and photovoltaic, the difference between actual physical flows and the market exchanges can be very substantial. Remedial actions were identified by previous smart grid studies within the 6th European framework program in operational risk assessment, flow control and operational flexibility measures for this area. At the same time an efficient and sustainable electricity system requires an efficient usage of existing and future transmission capacities to provide a maximum of transportation possibilities. New interconnections and devices for load flow control will be integrated in future transmission networks and will offer new operational options. Further developments of coordinated grid security tools are one of the major challenges TSOs will face in future. The methods to be applied have to take into account all technological measures to enhance flexibility of power system operations. The zonal structure of the European energy market along with the legal responsibilities of TSOs for different system areas will continue to pose increasingly complex requirements to the system operators concerning the quality and accuracy of cooperation. The proposed UMBRELLA research and demonstration project is designed for coping with these challenging issues and boundary conditions. The toolbox to be developed will enable TSOs to ensure secure grid operation also in future electricity networks with high penetration of intermittent renewables. It enables TSOs to act in a coordinated European target system where regional strategies converge to ensure the best possible use of the European electricity infrastructure.'

Introduzione (Teaser)

Cross-border exchanges and a growing contribution of intermittent renewable energy sources (RESs) are threatening the secure operation of the EU's electricity system. Scientists are creating a management toolbox to help to address the problem.

Descrizione progetto (Article)

Transmission system operators (TSOs) are facing increasingly complex requirements regarding cooperation to ensure reliable grid operation in current and future pan-EU electricity network. Scientists are developing a toolbox for innovative power flow management in future electricity systems with substantial contributions from intermittent RESs, with EU funding of the project http://www.e-umbrella.eu/ (UMBRELLA) .

The work takes into account integration of an increasing number of load flow control devices and other technological measures to enhance security. Among these are flexible alternating current transmission (FACTS) and high-voltage direct current (HVDC) lines. The toolbox will simulate uncertainties related to market demand and input from RESs on time scales from real-time to day-ahead. It will optimise corrective actions based on total costs and transmission capabilities. Finally, the toolbox will include risk-based assessment of anticipated system states with and without those actions.

During the first project phase, scientists finalised the methodologies for the three components of the toolbox. Modelling of uncertainties includes those related to wind and solar power sources, loads, short-term trading and power plant outages. Evaluation models for all remedial actions include topology adjustments, transformer tap changing, tapping of shunt elements, setting of FACTS set points, control of HVDC lines and re-dispatch. The risk-based assessment includes both the probability and severity of events.

TSO expectations and needs have been determined and used to formulate the toolbox requirements. Realisation of the prototype toolbox for forecasting and optimisation is underway regarding interfaces, data formats, data processing and preparation of databases. In addition, the team has made excellent progress in setting up the test cases, including initiating the draft version of a test book. Several workshops have been conducted and work has been presented at conferences, in five publications and on the project website.

Knowledge acquired will facilitate the development of efficient and effective TSO cooperation rules. The UMBRELLA toolbox will incorporate novel prediction and optimisation methodologies. This will significantly contribute to electricity network security in the face of increasing cross-border challenges and the use of intermittent RESs.