Optimal Sizing of a Photovoltaic/Battery Energy Storage System to Supply Electric Substation Auxiliary Systems under Contingency
Author:
Gonçalves Ailton1, Cavalcanti Gustavo O.1, Feitosa Marcílio A. F.1ORCID, Dias Filho Roberto F.1ORCID, Pereira Alex C.2ORCID, Jatobá Eduardo B.2ORCID, de Melo Filho José Bione2, Marinho Manoel H. N.1ORCID, Converti Attilio3ORCID, Gómez-Malagón Luis A.1ORCID
Affiliation:
1. Postgraduate Program in Systems Engineering, Department of System Engineering, Polytechnic School of Pernambuco, University of Pernambuco, Recife 50720-001, PE, Brazil 2. São Francisco Hydroelectric Company (Chesf), Recife 50761-901, PE, Brazil 3. Department of Civil, Chemical and Environmental Engineering, Pole of Chemical Engineering, University of Genoa, Via Opera Pia 15, 16145 Genoa, Italy
Abstract
Electric substations (ESS) are important facilities that must operate even under contingency to guarantee the electrical system’s performance. To achieve this goal, the Brazilian national electricity system operator establishes that alternating current (AC) auxiliary systems of ESS must have, at least, two power supplies, and in the case of failure of these sources, an emergency generator (EG) must at least supply energy to the essential loads. In order to improve the availability of auxiliary systems, a microgrid with other sources, such as photovoltaic (PV) systems and Battery Energy Storage Systems (BESS), can be an alternative. In this case, an economical optimization of the PV/BESS system must be addressed considering the costs associated with the installation and maintenance of equipment, and the gains from the credits generated by the photovoltaic system in the net metering scheme. In this paper, the size of the BESS system was determined to supply energy to the load of auxiliary systems of an ESS, as well as a PV system to achieve a null total cost. Furthermore, multi-objective optimization using the genetic algorithm technique was employed to optimize the size of the hybrid PV/BESS to minimize the investment cost and time when the demand was not met. Simulations under different scenarios of contingency were allowed to obtain the Pareto frontier for the optimal sizing of a PV/BESS system to supply energy to AC auxiliary systems in an ESS under contingency.
Funder
National Electric Energy Agency, ANEEL Eletrobras-Chesf
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
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