Clóvis Bôsco Mendonça Oliveira

Universidade Federal do Maranhão

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Co-Authors

Osvaldo R. Saavedra

Universidade Federal do Maranhão

Denisson Q. Oliveira

Universidade Federal do Maranhão

Darliane Ribeiro Cunha

Universidade Federal do Maranhão

Manoel Firmino de Medeiros

Federal Institute of Education, Science and Technology Alagoas

Francisco L. A. Neto

Universidade Federal do Rio de Janeiro

Shigeaki L. de Lima

Universidade Federal do Maranhão

Audálio Rebelo Torres

Universidade Federal do Maranhão

Marcelo de Santana Porte

Universidade Federal do Rio Grande do Norte

Ramon Morais de Freitas

National Institute for Space Research

José Tavares de Oliveira

Universidade Federal do Rio Grande do Norte

Cooperative Institutions

Universidade Federal do Maranhão

Universidade Federal do Rio Grande do Norte

Agência Nacional de Energia Elétrica

Universidad Filadelfia de México

Universidade Federal de Itajubá

Universidade de São Paulo

Energy Institute

Universidade Estadual do Maranhão

Universidade Federal de Santa Catarina

National Institute for Space Research

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Analysis of the potential of wind and ocean energy in the State of Maranhão

Jonas Vicente Pinto Clóvis Bôsco Mendonça Oliveira Nadia Velez Parente Osvaldo R. Saavedra

Brazil has its energy matrix mostly based on renewable energies from hydroelectric plants, however the water potential of Northeastern States is saturated. Thus, there is a need for their diversification by other renewable sources. Regarding this context, the State of Maranhão presents properties that are favorable to the exploration of wind and tidal power, even if at different scales. However, there are barriers such as the insufficient number of studies, a significant number of areas of environmental protection and slight government incentives for the production of renewable energy. Therefore, this study proposes the comparative evaluation of the potential of wind power generation, in relation to the potential of tidal power generation in the State coast. The evaluation was done through a bibliographical research related to the proposed subject. It has been verified that wind generation is more advanced and feasible only on the western coast of the State, where average wind speeds are between 8.0 m / s and 8.5 m/s, with energy density of wind of the order of 350 W/m ² . Consequently, there are wind farm projects in operation and prospected in the region. As for tidal power production, the State of Maranhão is one of the few sites with the potential for exploitation of tidal power in the world, with at least three bays with great potential for power generation, which are the bays of Turiaçu, Bacanga estuary and Ilha do Medo. Even with the environmental obstacles, studies indicate the possibility of implementation with significant reduction of impacts, giving technical-economic viability to the project. Furthermore, the energy data extracted from the tides of its coast were higher than the data obtained by wind strength, reaching a value of up to 2,260 w/m ² .

Tidal power

Marine energy

10.1109/induscon.2018.8627305

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Exploração da Complementaridade Eólica - Solar no Uso Eficiente dos Contratos de Uso do Sistema de Transmisão de Energia Elétrica

Anais do ... Simpósio Brasileiro de Sistemas Elétricos (2022)

Rafael B. S. Veras Augusto A. A. Chaves Clóvis Bôsco Mendonça Oliveira Denisson Q. Oliveira Osvaldo R. Saavedra

In this paper, the exploration of the complementarity between renewable sources to improve the use of the transmission capacity contracted by the generating agent considering the new rules established by the Brazilian regulatory body is proposed. To quantify the complementarity between sources, the Pearson coefficient is used. The results of the case study prove that the exploitation of complementarity through the implementation of hybrid projects based on renewable energy sources leads to significant gains in the exploitation of the transmission contract, thus bringing benefits to the generating agent.

Complementarity (molecular biology)

10.20906/sbse.v2i1.2948

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Assessing Economic Complementarity in Wind–Solar Hybrid Power Plants Connected to the Brazilian Grid

Sustainability (2023)

Rafael B. S. Veras Clóvis Bôsco Mendonça Oliveira Shigeaki L. de Lima Osvaldo R. Saavedra Denisson Q. Oliveira

The share of electricity generation from Variable Renewable Energy Sources (VRES) has increased over the last 20 years. Despite promoting the decarbonization of the energy mix, these sources bring negative characteristics to the energy mix, such as power ramps, load mismatch, unpredictability, and fluctuation. One of the ways to mitigate these characteristics is the hybridization of power plants. This paper evaluates the benefits of hybridizing a plant using an AI-based methodology for optimizing the wind–solar ratio based on the Brazilian regulatory system. For this study, the hybrid plant was modeled using data collected over a period of 10 months. The measurements were obtained using two wind profilers (LIDAR and SODAR) and a sun tracker (Solys 2) as part of the EOSOLAR R&D project conducted in the state of Maranhão, Brazil. After the power plant modeling, a Genetic Algorithm (GA) was used to determine the optimal wind–solar ratio, considering costs with transmission systems. The algorithm achieved a monthly profit increase of more than 39% with an energy curtailment inferior to 1%, which indicates economic complementarity. Later, the same methodology was also applied to verify the wind–solar ratio’s sensitivity to solar energy pricing. The results show that a price increase of 15% would change the power plant’s optimal configuration.

Grid parity

10.3390/su15118862

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Mission Critical Microgrids: The Case of the Alcântara Space Center

Energies (2022)

César Augusto Santana Castelo Branco Fabricio P. Moraes Hércules Araújo Oliveira Pedro Bezerra Leite Neto Osvaldo R. Saavedra

This article reports the conception and design of a mission critical microgrid to serve a critical infrastructure application, namely, the Alcântara Space Launch Center, a government military facility in Brazil. The assumptions, general characteristics, requirements and particularities arising from the application are established and discussed in detail. High resilience and energy security are required in critical periods of operation, demanding a power supply infrastructure composed of redundant and dispachable sources capable of supporting n−1 generation contingencies. Whereas, in the remaining time, economic and environmental aspects take place as main requests. Operation scenarios, on both grid-connected (on-grid) and isolated (off-grid) modes, are formulated as optimization problems and simulations have been performed to analyze these scenarios, which are reported and analyzed here. The off-grid operation, which is clearly more complex, is preferentially addressed, especially in scenarios with contingencies. In this context, the proposed microgrid is conceived to satisfactorily balance requirements such as the economy, pollutant emission reduction, high reliability, resilience and operational security, which are requested by this critical infrastructure application.

Microgrid

Resilience

10.3390/en15093226

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A method for definition of the active power limits of distributed generation through an optimal strategy

Manoel Firmino de Medeiros Max Chianca Pimentel Filho Clóvis Bôsco Mendonça Oliveira

Distributed generation is already a reality in almost all countries in the world. Wind farms, cogeneration systems and SHP (small hydropower) are already common elements that can be connected to medium voltage systems (up to 15kV). Additionally, with the development of technology and reduced costs, it is expected that the number of generations connected to the network increases, whether coming from solar collectors, biomass, SHP, wind, or any other kind which will become popular. Based on this premise, a new problem arises, what is the best place for each connection to the network. This work aims to develop a method that will determine the best connection point for each generation to the distribution network in order to achieve a reduction in active power flows in its sections, so that, the global network loading becomes minimal. (4 pages)

Cogeneration

Small hydro

10.1049/cp.2012.0887

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Method for network simplification for voltage variation analysis caused by wind farm integrated on power system with two different treatments for boundary buses

Clóvis Bôsco Mendonça Oliveira José Tavares de Oliveira Manoel Firmino de Medeiros B. A. da Silva Pires

This work presents a description of the development of a model for representation of simplified grid applied in hybrid load flow for calculation of the voltage variations in steady-state provoked by wind farm on power system with two different treatments for boundary buses. At the beginning of the analysis process on system, lead for the wind producer, it has as base given technician data supplied by the concessionaire. The main aim consists to propose models of simplified networks that allow to the necessity of the knowledge only of the data referring the internal network, that is, the parcel of the network of interest for analysis. This way, it is intended to supply forms for auxiliary in the systematization of the relations between the sector agents. The model of simplified network proposed identifies the internal network, external network and the boundary buses from a vulnerability study of the grid, testing to the boundary buses active and reactive powers floating model (slack buses) and determination of powers by optimization process using Particle Swarm Optimization. It was opted to apply the cited model in a hybrid load flow, composite by Gauss Seidel Zbus and Summation Power methods. Finally, presents the results obtained for a developed computational environment of FORTRAN, with their respective analysis and conclusion.

Fortran

10.1109/induscon.2010.5740053

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ANÁLISE DA OFERTA DE SERVIÇOS ESPECIALIZADOS PARA O DESENVOLVIMENTO DA INDÚSTRIA EÓLICA BRASILEIRA

Congresso Nacional de Engenharia Mecânica e Industrial (2018)

Jonas Fontes de Carvalho Yuri dos Santos Pontes Vieira Clóvis Bôsco Mendonça Oliveira Shigeaki Leite de Lima

10.17648/conemi-2018-91250

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Revisão de Métodos de Estimativa do Comprimento de Rugosidade Aerodinâmica para Fins de Obtenção de Energia Eólica

Anais do ... Simpósio Brasileiro de Sistemas Elétricos (2022)

Natália P. Saraiva Erika T. I. Barbosa Francisco L. A. Neto Clóvis Bôsco Mendonça Oliveira Osvaldo R. Saavedra

In this article, is proposed to identify the methods for estimating aerodynamic roughness length (z0) best suited to feasibility studies for the construction of wind farms. For that, a systematic review is carried out to filter the latest works that apply different methods to find z0 values. Identifying z0 for a specific surface is important to simulate the vertical wind profile and mechanical and turbulent fluxes estimation in the atmospheric surface layer. Must be considered those factors in viability studies for a wind farm, therefore impacting the calculation of energy efficiency. Morphometric and micrometeorological methods are listed, besides presenting works that have developed tables with z0 optimal values for different types of land. In the end, situations are presented in which each method has better applicability.

Roughness length

10.20906/sbse.v2i1.3142

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Modeling of equivalent grids through vulnerability studies for analysis of power systems with wind producers

Renewable Energy and Power Quality Journal (2017)

Clóvis Bôsco Mendonça Oliveira José Tavares de Oliveira Manoel Firmino de Medeiros

Vulnerability

10.24084/repqj10.532

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Caracterização e Aplicações de Microrredes de Missão Crítica

Congresso Brasileiro de Automática (2022)

Fabricio P. Moraes Hércules Alves de Oliveira Clóvis Bôsco Mendonça Oliveira José Gomes de Matos Osvaldo R. Saavedra

Mission-critical microgrids present themselves as an opportunity to add resilience and reliability to critical processes, characterized by strict requirements for energy continuity, achieving a strategic connotation for different civil and military sectors. In this context, this article reviews the concepts, classifications, modes of operation, and management of a microgrid, emphasizing critical microgrids. The work also includes cases focused on this application, including the conceptual scope of the circuit and management strategies of a microgrid under implementation in a Brazilian aerospace launch center. Based on this experience and on what has been reported from other microgrids already implemented, the main challenges and particularities involved in the installation and operation of microgrids are addressed, especially those related to the aspects of selectivity, coordination, and resilience of the electrical protection system of the microgrid, also observing criteria of economic and energy optimality.

Microgrid

Scope (computer science)

Resilience

Connotation

10.20906/cba2022/3298

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