Student: MARIANA DE MORAIS CAVALCANTI
Title: ESTUDOS DE MELHORIAS NO SUPRIMENTO ENERGÉTICO DOS SISTEMAS AUXILIARES DE SUBESTAÇÕES CONECTADAS À REDE BÁSICA
Supervisor: PROF. DR. MANOEL HENRIQUE DA NÓBREGA MARINHO
External Examiner: PROF. DR. HUGO VALADARES SIQUEIRA
Internal Examiner: PROF. DR. ROBERTO FELICIANO DIAS FILHO
Date: JUNE 28th, 2023
Time: 14:00
Place: Online - meet.google.com/eqx-fhvp-ewv
Abstract:
The substations (SEs) of the Basic Grid (transmission facilities that are part of the National Interconnected System with operating voltage level equal to or greater than 230 kV), must follow the Network Procedures (NP) established by the National Electric System Operator - ONS. Among these documents there is the Sub-module (2.6), which dictates the minimum requirements for the SEs and its equipment. With regard to the auxiliary services of the substations and, more specifically, to the alternating current (AC) power supply, these must have at least two power supplies, one external from the local distribution company and the other internal from the substation itself or two internal sources. In the second case, the sources must be provided through the transformer's tertiary or through a transformer dedicated for this purpose (TSA - Auxiliary Services Transformer). If none of these options are feasible for the substation under study, the agent responsible for the project should propose a solution for ONS to evaluate and, if consistent, approve. Furthermore, the substation should include a motor-generator group (GMG) with automatic startup and the capacity to feed the essential loads of the substation, in order to maintain the supply in case of a shortage in the two sources of supply. Many substations fail to comply with this sub-module and use GMG as the second main source. However, GMGs, in case of contingency, are not able to instantly supply power since they have an inertia time to come into operation. Furthermore, this solution is not environmentally friendly due to the gases emitted when the fuel is burned. Therefore, the Companhia Hidro Elétrica do São Francisco (CHESF) published the public call for RD project, under ANEEL's Research and Technological Development Program, entitled "Photovoltaic Minigeneration with Energy Storage by Batteries as an Autonomous Source of Supply of the Auxiliary Services of 230/500 kV Substations with Internal Source Restriction" to be applied at SE Messias/AL. Thus, this work developed solutions to replace the GMGs, both for the internal source and the emergency source, by more sustainable and efficient components: the Battery Energy Storage Systems (BESS), with or without the addition of a Photovoltaic (PV) system. For this, simulations were performed in the Homer Pro software and, with the results, analyses of reliability, environmental impact and financial viability. Finally, the best solution was the BESS with the PV System, being able to maintain the GMG for the case of emergency when there is only one Source, being it: external, coming from the transformer's tertiary or from the TSA.
Keywords: Milk Processing; Slow Pasteurization; Cheese Production; Thermal Solar Energy; Cooling Tower; Energetic Performance.
O Programa
