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Alberto Borghetti

Full Professor

Department of Electrical, Electronic, and Information Engineering "Guglielmo Marconi"

Academic discipline: ING-IND/33 Electrical Power Systems


Keywords: Microgrids Lightning protection Electrical power generation Fault location Distributed generation Electrical power systems

-       dynamic behavior of power stations and electrical power systems,

-       decision support tools for power producers in a competitive electricity market,

-       coordination of surge protection particularly against the effects of lightning,

-       automatic fault location in medium voltage distribution networks,

-       power quality improvements in distribution networks,

-       analysis and control of distribution systems with embedded generation from renewable sources and of microgrids.

1. Analysis of the dynamic behavior of electric power plants and power systems, with particular reference to power system restoration procedures after blackouts and to the load modeling

The research activity aims at verifying the thermoelectric power plant capability to autonomously start-up and restore the electricity service after a black-out, which means, in turn, at assessing and improving the black-start capabilities of these power plants. In particular, the research, carried out in collaboration with CESI and HERA, focuses on steam groups repowered by gas turbines.  The interaction of the charges dynamics with the one of the different regulators on the net, and in particular with the dynamics of the under load tap changers, of the transformers and of the voltage regulators is analyzed in collaboration with the research Group at the University of Padova.

2. Decision support tools for power producers in a competitive electricity market.

The research deals with the development of a method for the solution of the Unit Commitment (UC) problem in a competitive market with demand-side bidding (DSB) explicitly considered; in order to allow customers to play a proactive role in the price determination process, the DSB provides the opportunity for them to submit bids for load reductions in specific periods. The research activity concerns also the critical analysis of optimization algorithms applied to the UC problem. For this specific topic, the research, carried out in cooperation with the Department of Informatics of the University of Pisa and the Operations research group at the University of Bologna, also in the framework of Project Decisopelet 2006 supported by the University of Bologna.

3. Evaluation of the lightning performance of distribution lines and networks, with particular reference to the protection against indirect lightning for the power quality improvement.

The main effort of the activity is devoted to the development of a computer code, LIOV (“Lightning-induced overvoltages”), which allows for the calculation of lighting-induced voltages on multiconductor lines above a lossy soil as a function of line geometry, lightning current wave shape, return-stroke velocity, soil resistivity, etc. 

4. Distribution networks operation in presence of small scale generating plants and microgrids

The introduction of generators in distribution grids, possibly together with storage systems, could cause a substantial change in grid operational practice: currently a rising idea proposes to treat generators as distributed resources that are able to supply services to the grid and accept on-line requests. The focus of this research, carried out also in the framework of research collaborations with CESI, ENEL, Univ. of Genova, and HERA, is the development of an automatic scheduler of distributed energy resources. In collaboration with the Energy system group at the University of Bologna, also in the framework of a PRIN 2007 project supported by the Ministry of University and Scientific Research, the research aims also at developing a fully automatic scheduling system of an experimental microgrid composed by a 5 kW PEM FC, a PV emulator, a lead-acid battery system and reactive controllable loads.

5. Fault location in distribution networks.

A fault location procedure for distribution networks based on the wavelet analysis of the fault‑generated traveling waves has been developed. In particular, the proposed procedure implements the continuous wavelet analysis applied to the voltage waveforms recorded during the fault in correspondence of a network bus. In order to improve the wavelet analysis, an algorithm is proposed to build specific mother wavelets inferred from the fault-originated transient waveforms.

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