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About

About

Fábio Sester Retorta is an electrical engineer graduated at the Federal University of Paraná (UFPR). During his time in Brazil, he worked for 3 years with ANEEL R & D projects and services in the area of electric power quality by the company Lactec. Fábio earned his master's degree in UFPR with the theme of an ANEEL R & D project being awarded 1 place in the CIGRE Showcase Paris 2018. Since 2015 the researcher has been contributing with publications in international events, chapters of Brazilian books and Brazilian periodicals. The researcher has been working with the themes: electric power quality of wind farms / GD, operation of distributed generation, storage systems, solar thermal energy (CSP), rural electrification, multicriteria methodologies, fuzzy systems, optimization, forecasting methods, and planning of distribution systems. Fábio has taught classes at SENAI and CEPS (technical schools in Brazil) and is a member of the C6 group of CIGRÉ. He currently works at CPES with topics related to energy markets, deregulated electricyty markets, flexibilities in electricity markets, OPF and optimization methods

Interest
Topics
Details

Details

  • Name

    Fábio Retorta
  • Cluster

    Power and Energy
  • Role

    Research Assistant
  • Since

    18th February 2019
003
Publications

2020

Local Market for TSO and DSO Reactive Power Provision Using DSO Grid Resources

Authors
Retorta, F; Aguiar, J; Rezende, I; Villar, J; Silva, B;

Publication
ENERGIES

Abstract
This paper proposes a near to real-time local market to provide reactive power to the transmission system operator (TSO), using the resources connected to a distribution grid managed by a distribution system operator (DSO). The TSO publishes a requested reactive power profile at the TSO-DSO interface for each time-interval of the next delivery period, so that market agents (managing resources of the distribution grid) can prepare and send their bids accordingly. DSO resources are the first to be mobilized, and the remaining residual reactive power is supplied by the reactive power flexibility offered in the local reactive market. Complex bids (with non-curtailability conditions) are supported to provide flexible ways of bidding fewer flexible assets (such as capacitor banks). An alternating current (AC) optimal power flow (OPF) is used to clear the bids by maximizing the social welfare to supply the TSO required reactive power profile, subject to the DSO grid constraints. A rolling window mechanism allows a continuous dispatching of reactive power, and the possibility of adapting assigned schedules to real time constraints. A simplified TSO-DSO cost assignment of the flexible reactive power used is proposed to share for settlement purposes.

2020

Local Energy Markets for Energy Communities with Grid Constraints

Authors
Rocha R.; Collado J.V.; Soares T.; Retorta F.;

Publication
International Conference on the European Energy Market, EEM

Abstract
Renewable energy communities (REC) and local energy markets (LEM) emerge as entities capable, not only to promote the penetration of renewable energy sources into lower levels of the grid, but also to manage distributed energy resources (DER) and local energy exchanges between small players. This paper proposes a benefit assessment among different regulatory frameworks for LEM, considering network constraints and a virtual storage unit. Results show significant savings can be achieved, even without storage. Therefore, the continuous increase of DER can have considerable grid impacts if not complemented by other structures as storage or by alternative market services like flexibility. © 2020 IEEE.

2020

Flexibility hub – Flexibility provision by decentralised assets connected to the distribution grid

Authors
Filipe, NL; Marques, M; Villar, J; Silva, B; Moreira, J; Louro, M; Retorta, F; Aguiar, J; Rezende, I; Simões, T; Marinho, N;

Publication
IET Conference Publications

Abstract
EU-SysFlex H2020 project aims at developing and testing innovative tools for the integration of high levels (above 50%) of renewable energy sources (RES) in the pan-European Electricity system. Those high levels of RES will increase the need for new sources of flexibility to support the system services, since there will be a decreasing number of conventional power plants connected to the grid, traditionally the main providers of these services. In this context, this study describes the Flexibility Hub (FlexHub) concept, part of the EU-SysFlex Portuguese demonstrator, consisting of a platform of tools managed by the distribution system operator to facilitate market-based flexibility provision to the transmission system operator (TSO) using resources connected to the distribution system. The FlexHub includes the provision of active power flexibility to the TSO (with an extended restoration reserve market concept), an essential tool to help the TSO balancing the grid, being a replicable concept that will become increasingly relevant in a future with a high share of decentralised assets connected to the distribution grids.

2020

Operational optimisation framework improving DSO/TSO coordination demonstrated in real network operation

Authors
Stock, DS; Löwer, L; Harms, Y; Wende Von Berg, S; Braun, M; Wang, Z; Albers, W; Calpe, C; Staudt, M; Silva, B; Retorta, F; Silva, JV; Carvalho, L;

Publication
IET Conference Publications

Abstract
The study at hand describes the state of the art regulatory framework for managing the distribution system operator (DSO)/transmission system operator (TSO) interface including information about the available flexibility data and access rights of the different grid operators. It describes a possible future procedure to manage this interface using software tools to support this coordination performing grid analysis and providing active as well as reactive power flexibility information at several TSO–DSO interconnection points. The proposed study gives a short overview of two optimisation approaches/software tools with different application functionalities, developed and adapted to meet the demands coming up with such tasks, performed within the European project ‘EU-SysFlex’. Both tools contribute to the objective of optimising available flexibility resources connected to meshed distribution grids with multiple grid connection points to the transmission grid. The investigations/calculations are performed using a real existing high-voltage grid of MITNETZ STROM. Using the outputs, provided by both tools, the demonstrator aims at providing beneficiary results for the discussion of how to evolve the regulatory framework. The functionality of the developed algorithms of both optimisation tools is evaluated and investigated by means of a live field test.

2020

Reactive power provision using distribution grid resources: flexibility hub use case

Authors
Moreira, J; Louro, M; Simões, TF; Villar, J; Fulgêncio, N; Silva, B; Retorta, F; Aguiar, J; Rezende, I; Filipe, NL; Marinho, N;

Publication
IET Conference Publications

Abstract
With the energy transition at sight and the EU renewable energy source integration ambition, the EU-SysFlex project aims at defining a set of advancements in the electric system that drives us towards that direction. With the increasing decentralisation and granularity of the generation facilities, local generation will gain a determinant role in the provision of future local and global systems services. This study presents an overview of a framework for a local market for reactive power control that will be implemented and demonstrated under a real scenario in a Portuguese demo site. The demonstration includes a set of capacitor banks of the distribution system operator (DSO) and two wind farms of a wind power generation operator. This local reactive power market consists of a close to real-time continuous intraday local market managed by the DSO, with 15 min delivery time to increase temporal granularity, and with 7 h delivery horizons with complex bids to allow more flexible assets operation. Market agents can also correct future previously scheduled positions by participating themselves as sellers or buyers of capacitive or inductive reactive power, providing a more flexible framework.