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Papers by Dorel Soares Ramos

Research paper thumbnail of Evaluation of Capacity Markets in the Political Dimension of the Full Potential Energy Resources Methodology

Research paper thumbnail of Avaliação econômica da operação de centrais termelétricas a gás natural

Research paper thumbnail of Capacity Payments to Foster Hydro-Wind Portfolio Investments: A Real Option Analysis

Research paper thumbnail of Analysis of the Implementation of Virtual Power Plants and Their Impacts on Electrical Systems

Energies

The increasing penetration of Distributed Energy Resources (DERs) in Distribution Systems (DSs) h... more The increasing penetration of Distributed Energy Resources (DERs) in Distribution Systems (DSs) has motivated studies on Virtual Power Plants (VPPs). However, few studies have jointly assessed the sizing and economic attractiveness of VPPs from the entrepreneur’s perspective and the potential benefits and impacts on power systems while maintaining the scope to DSs. This study proposes a methodology for sizing VPPs and simulating their economic optimal dispatch and economic attractiveness with a focus on the entrepreneur’s viewpoint. In addition, it also evaluates VPPs’ potential benefits and impacts on a DS or Transmission System (TS) while considering the interface between the Distribution System Operator (DSO) and the Transmission System Operator (TSO). The methodology employs optimization to minimize the Net Present Cost (NPC) of the project, in relation to sizing the DERs, and to obtain the economic optimal dispatch of the BESSs that comprise the VPP. Moreover, a power flow anal...

Research paper thumbnail of Dimensionamento e alocacao da compensacao reativa para correcao do nivel de tensao: metodologia e experiencia de aplicacao

Research paper thumbnail of Brazilian Energy Sector Secret: The Higher the Reservoir Level, the Higher the River Flow

Social Science Research Network, 2023

It is a well-known fact that the climate and hydrology of a region can be significantly impacted ... more It is a well-known fact that the climate and hydrology of a region can be significantly impacted by water management practices. Typically, the downstream river flow is decreased in average because of new hydropower reservoirs development and operation due to an increase in evaporation in upstream dams. However, this is not true in every situation, as the present study demonstrates, showing how hydropower storage reservoirs can help boost river flows in humid locations like Brazil. Water storage and hydropower generation data from Brazilian basins in the Southeast region have been used to test this hypothesis. We discover that Brazil's river flows are significantly impacted by the operation of hydropower reservoirs. On average the yearly hydropower potential of a basin operation with full reservoir is 111% higher than when reservoirs are empty. In order to increase hydropower generation, the paper suggests solutions to fill up reservoirs after an energy crisis and to keep reservoirs full.

Research paper thumbnail of Evaluación de la eficiencia energética del lado de la oferta en la integración energética Brasil – Bolivia

Journal boliviano de ciencias, Jul 1, 2023

Evaluación de la eficiencia energética del lado de la oferta en la integración energética Brasil-... more Evaluación de la eficiencia energética del lado de la oferta en la integración energética Brasil-Bolivia Evaluation of the energy efficiency of the supply side in the Brazil-Bolivia energy integration Renán Orellana Lafuente (1) http//orcid.org/0009-0004-7761-1536, Ianca da Silveira de Oliveira(2) http//orcid.org/0000-0003-4370-4705, Dorel Soares Ramos(3), Miguel Edgar Morales Udaeta(4), Viviane Tavares Nascimento (5)

Research paper thumbnail of Estudo de localização de termoelétricas no Estado de São Paulo

Research paper thumbnail of Natural Gas Power Plants in the System Security Role – the Situation and Solutions in Brazil

Social Science Research Network, 2023

Research paper thumbnail of Inserção de centrais cogeradoras a bagaço de cana no parque energético do Estado de São Paulo: exemplo de aplicação de metodologia para análise dos aspectos locacionais e de integração energética

Page 1. UNIVERSIDADE DE SÃO PAULO Programa Interunidades de Pós-Graduação em Energia - PIPGE (EP/... more Page 1. UNIVERSIDADE DE SÃO PAULO Programa Interunidades de Pós-Graduação em Energia - PIPGE (EP/FEA/IEE/IF) INSERÇÃO DE CENTRAIS COGERADORAS A BAGAÇO DE CANA NO PARQUE ENERGÉTICO DO ESTADO DE SÃO PAULO: ...

Research paper thumbnail of Barriers to the Expansion of Sugarcane Bioelectricity in Brazilian Energy Transition

Energies, Jan 14, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of PRIOBI'TY ElULUATIOR AND UANKIIPG OF TBMISIIISSIOR SYSTEM PROJECTS COWUTEB PKIDELS AAD RESULTS

- One of the consequences of the severe economic crisis which has affected Brazil in the past yea... more - One of the consequences of the severe economic crisis which has affected Brazil in the past years has been a substantial reduction in the available resources for power system investments. If budget is constrained below the ideal investment level, the problem of defining .which generation and/or transmission investments should be postponed becomes very important. The objective of this paper is to describe a methodology for identifying which subset of transmission investments in a given expansion plan can be postponed in order to meet a preestablished budget constraint with the least possible impact on system performance. The methodology is based on the ranking of scheduled reinforcements by a costlbenefit index. The cost corresponds to the deterioration of operating conditions (e.g. increased risk of load curtailment) if the equipment is postponed. The benefit is associated with the financial relief brought by the postponement. A computational package for determining this ranking has been developed and is being used by the Brazilian utilities as a subsidy for deciding the adjustment of their expansion plans.

Research paper thumbnail of Improving Electricity Marketplace Security in Brazil: Role of Power Exchange to Support Further Market Liberalization

Research paper thumbnail of Economic Dispatch Considering Hourly Capacity Allocation with a Variable Renewable and Hydro-Based Generation Portfolio

Energy and Power Engineering, 2022

The objective of this paper is to assess an economic dispatch considering a power system portfoli... more The objective of this paper is to assess an economic dispatch considering a power system portfolio, which includes predominant amount of hydro power and increasing quantities of intermittent renewables in relation to the total electric capacity. With growing importance of intermittent wind and solar generation taking part into power systems worldwide, there is need for greater chronological resolution to estimate the flexibility of the power system to offer firm capacity. In this way, a linear optimization model operating hourly is developed to calculate the minimum power system cost, while stablishing the capacity allocation to meet the projected load throughout one-year simulation, as an estimation of how the hourly economic dispatch impacts the scheduling of generators belonging to a power system with this portfolio composition. A central focus is how to operate the available hydro capacity to back up intermittent renewables, evaluating the physical hydro operating constraints, monthly energy balance and maximum power availability. A case study was simulated based on the Brazil's power system configuration, showing that existing hydro capacity provide hourly flexibility to backup intermittent renewables, potentially saving 1.2 Billion R$, about 3.6% of total system cost referred to 2019. It is worthwhile to realize that the developed methodology can be employed to other power systems with similar capacity portfolio structure for the purpose of calculating its optimum allocation for a specified region and target year.

Research paper thumbnail of Pumped-Hydro Storage Plants Influencing the Optimal Hourly Dispatch in Hydro-Thermal Systems with Massive Integration of Variable Renewable Energy

Research paper thumbnail of Fatores de sucesso e principais dificuldades enfrentadas pelas micro e pequenas empresas na operacionalização de suas atividades na Cidade de São Francisco - PB

Universidade Federal de Campina Grande, 2015

Research paper thumbnail of Modelo computacional para analise de confiabilidade de sistemas compostos de grande porte

Research paper thumbnail of Consideracao de incertezas no planejamento da transmissao

Research paper thumbnail of Deep sea authigenic clays as a sink for seawater Mg through the Cenozoic

Research paper thumbnail of Resposta da demanda industrial e sua influência na formação dos preços de curto prazo no mercado de energia elétrica: uma proposta

Research paper thumbnail of Evaluation of Capacity Markets in the Political Dimension of the Full Potential Energy Resources Methodology

Research paper thumbnail of Avaliação econômica da operação de centrais termelétricas a gás natural

Research paper thumbnail of Capacity Payments to Foster Hydro-Wind Portfolio Investments: A Real Option Analysis

Research paper thumbnail of Analysis of the Implementation of Virtual Power Plants and Their Impacts on Electrical Systems

Energies

The increasing penetration of Distributed Energy Resources (DERs) in Distribution Systems (DSs) h... more The increasing penetration of Distributed Energy Resources (DERs) in Distribution Systems (DSs) has motivated studies on Virtual Power Plants (VPPs). However, few studies have jointly assessed the sizing and economic attractiveness of VPPs from the entrepreneur’s perspective and the potential benefits and impacts on power systems while maintaining the scope to DSs. This study proposes a methodology for sizing VPPs and simulating their economic optimal dispatch and economic attractiveness with a focus on the entrepreneur’s viewpoint. In addition, it also evaluates VPPs’ potential benefits and impacts on a DS or Transmission System (TS) while considering the interface between the Distribution System Operator (DSO) and the Transmission System Operator (TSO). The methodology employs optimization to minimize the Net Present Cost (NPC) of the project, in relation to sizing the DERs, and to obtain the economic optimal dispatch of the BESSs that comprise the VPP. Moreover, a power flow anal...

Research paper thumbnail of Dimensionamento e alocacao da compensacao reativa para correcao do nivel de tensao: metodologia e experiencia de aplicacao

Research paper thumbnail of Brazilian Energy Sector Secret: The Higher the Reservoir Level, the Higher the River Flow

Social Science Research Network, 2023

It is a well-known fact that the climate and hydrology of a region can be significantly impacted ... more It is a well-known fact that the climate and hydrology of a region can be significantly impacted by water management practices. Typically, the downstream river flow is decreased in average because of new hydropower reservoirs development and operation due to an increase in evaporation in upstream dams. However, this is not true in every situation, as the present study demonstrates, showing how hydropower storage reservoirs can help boost river flows in humid locations like Brazil. Water storage and hydropower generation data from Brazilian basins in the Southeast region have been used to test this hypothesis. We discover that Brazil's river flows are significantly impacted by the operation of hydropower reservoirs. On average the yearly hydropower potential of a basin operation with full reservoir is 111% higher than when reservoirs are empty. In order to increase hydropower generation, the paper suggests solutions to fill up reservoirs after an energy crisis and to keep reservoirs full.

Research paper thumbnail of Evaluación de la eficiencia energética del lado de la oferta en la integración energética Brasil – Bolivia

Journal boliviano de ciencias, Jul 1, 2023

Evaluación de la eficiencia energética del lado de la oferta en la integración energética Brasil-... more Evaluación de la eficiencia energética del lado de la oferta en la integración energética Brasil-Bolivia Evaluation of the energy efficiency of the supply side in the Brazil-Bolivia energy integration Renán Orellana Lafuente (1) http//orcid.org/0009-0004-7761-1536, Ianca da Silveira de Oliveira(2) http//orcid.org/0000-0003-4370-4705, Dorel Soares Ramos(3), Miguel Edgar Morales Udaeta(4), Viviane Tavares Nascimento (5)

Research paper thumbnail of Estudo de localização de termoelétricas no Estado de São Paulo

Research paper thumbnail of Natural Gas Power Plants in the System Security Role – the Situation and Solutions in Brazil

Social Science Research Network, 2023

Research paper thumbnail of Inserção de centrais cogeradoras a bagaço de cana no parque energético do Estado de São Paulo: exemplo de aplicação de metodologia para análise dos aspectos locacionais e de integração energética

Page 1. UNIVERSIDADE DE SÃO PAULO Programa Interunidades de Pós-Graduação em Energia - PIPGE (EP/... more Page 1. UNIVERSIDADE DE SÃO PAULO Programa Interunidades de Pós-Graduação em Energia - PIPGE (EP/FEA/IEE/IF) INSERÇÃO DE CENTRAIS COGERADORAS A BAGAÇO DE CANA NO PARQUE ENERGÉTICO DO ESTADO DE SÃO PAULO: ...

Research paper thumbnail of Barriers to the Expansion of Sugarcane Bioelectricity in Brazilian Energy Transition

Energies, Jan 14, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of PRIOBI'TY ElULUATIOR AND UANKIIPG OF TBMISIIISSIOR SYSTEM PROJECTS COWUTEB PKIDELS AAD RESULTS

- One of the consequences of the severe economic crisis which has affected Brazil in the past yea... more - One of the consequences of the severe economic crisis which has affected Brazil in the past years has been a substantial reduction in the available resources for power system investments. If budget is constrained below the ideal investment level, the problem of defining .which generation and/or transmission investments should be postponed becomes very important. The objective of this paper is to describe a methodology for identifying which subset of transmission investments in a given expansion plan can be postponed in order to meet a preestablished budget constraint with the least possible impact on system performance. The methodology is based on the ranking of scheduled reinforcements by a costlbenefit index. The cost corresponds to the deterioration of operating conditions (e.g. increased risk of load curtailment) if the equipment is postponed. The benefit is associated with the financial relief brought by the postponement. A computational package for determining this ranking has been developed and is being used by the Brazilian utilities as a subsidy for deciding the adjustment of their expansion plans.

Research paper thumbnail of Improving Electricity Marketplace Security in Brazil: Role of Power Exchange to Support Further Market Liberalization

Research paper thumbnail of Economic Dispatch Considering Hourly Capacity Allocation with a Variable Renewable and Hydro-Based Generation Portfolio

Energy and Power Engineering, 2022

The objective of this paper is to assess an economic dispatch considering a power system portfoli... more The objective of this paper is to assess an economic dispatch considering a power system portfolio, which includes predominant amount of hydro power and increasing quantities of intermittent renewables in relation to the total electric capacity. With growing importance of intermittent wind and solar generation taking part into power systems worldwide, there is need for greater chronological resolution to estimate the flexibility of the power system to offer firm capacity. In this way, a linear optimization model operating hourly is developed to calculate the minimum power system cost, while stablishing the capacity allocation to meet the projected load throughout one-year simulation, as an estimation of how the hourly economic dispatch impacts the scheduling of generators belonging to a power system with this portfolio composition. A central focus is how to operate the available hydro capacity to back up intermittent renewables, evaluating the physical hydro operating constraints, monthly energy balance and maximum power availability. A case study was simulated based on the Brazil's power system configuration, showing that existing hydro capacity provide hourly flexibility to backup intermittent renewables, potentially saving 1.2 Billion R$, about 3.6% of total system cost referred to 2019. It is worthwhile to realize that the developed methodology can be employed to other power systems with similar capacity portfolio structure for the purpose of calculating its optimum allocation for a specified region and target year.

Research paper thumbnail of Pumped-Hydro Storage Plants Influencing the Optimal Hourly Dispatch in Hydro-Thermal Systems with Massive Integration of Variable Renewable Energy

Research paper thumbnail of Fatores de sucesso e principais dificuldades enfrentadas pelas micro e pequenas empresas na operacionalização de suas atividades na Cidade de São Francisco - PB

Universidade Federal de Campina Grande, 2015

Research paper thumbnail of Modelo computacional para analise de confiabilidade de sistemas compostos de grande porte

Research paper thumbnail of Consideracao de incertezas no planejamento da transmissao

Research paper thumbnail of Deep sea authigenic clays as a sink for seawater Mg through the Cenozoic

Research paper thumbnail of Resposta da demanda industrial e sua influência na formação dos preços de curto prazo no mercado de energia elétrica: uma proposta