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Doctoral Thesis
DOI
https://doi.org/10.11606/T.3.2023.tde-03082023-142432
Document
Author
Full name
Khalid Salman Khan
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2023
Supervisor
Committee
Salles, Maurício Barbosa de Camargo (President)
Cardoso, Jose Roberto
Júnior, José Carlos de Melo Vieira
Alves, Erick Fernando
Asada, Eduardo Nobuhiro
Title in Portuguese
Metodologia para despacho econômico de sistemas de energia offshore híbridos e isolados.
Keywords in Portuguese
Análise de flexibilidade
Despacho econômico
Ferramenta LGridPy
Mecânica dos sólidos
Otimização
Sistema de energia de petróleo e gás
Abstract in Portuguese
A incorporação de Energias Renováveis (ER) no sistema de energia convencional de uma plataforma de Petróleo e Gás (P&G) pode resultar em uma redução significativa nos custos operacionais e nas emissões. No entanto, a penetração de energias renováveis no sistema de energia convencional pode causar sérias instabilidades devido à natureza intermitente, especialmente nos sistemas de energia híbridos autônomos. Portanto, a flexibilidade do sistema de energia convencional deve ser avaliada previamente, para acomodar e compensar a penetração variável da energia renovável. Nesta tese, um método inovador é introduzido para realizar o despacho econômico das unidades geradoras do sistema de energia híbrido autônomo, garantindo a segurança do sistema de energia. Este método considera: (a) a curva de eficiência das Turbinas a Gás (TGs) para simular cenários do mundo real de forma robusta, (b) as restrições de ROCOF (Taxa de Variação de Frequência) e reserva girante para melhorar a segurança do sistema, restringindo a variação de frequência durante eventos de contingência, e (c) a análise de flexibilidade do sistema de energia convencional autônomo de uma plataforma de P&G para avaliar a capacidade do sistema de energia em acomodar a demanda e as variações de ER. Para o problema de Despacho Econômico (DE), a fim de minimizar o custo operacional global (incluindo combustível, custo de inicialização, desligamento e manutenção) do sistema de energia, o LGridPy adota a técnica de Programação Não Linear com Variáveis Inteiras Mistas e resolve o sistema com a ajuda do solver MindtPy, utilizando o resolvedor Gurobi para o Problema Linear de Variáveis Inteiras Mistas (PLVIM) e o resolvedor IPOPT para o Problema Não Linear (PNL). O novo método considera vários Indicadores-Chave de Desempenho (ICDs) e indicadores de flexibilidade para o modelo do sistema de energia, a fim de avaliar a resposta do sistema em diferentes condições e estudos de caso.
Title in English
Methodology to economically dispatch hybrid isolated offshore power systems.
Keywords in English
Economic dispatch
Flexibility analysis
LGridPy tool
Oil and gas power system
Optimization
Abstract in English
The incorporation of Renewable Energy (RE) into the conventional standalone power system of an Oil and Gas (OG) platform can result in a significant reduction in operational cost and emissions. Whereas, the penetration of renewables into the conventional power system can cause serious instabilities due to the intermittent nature, especially in the standalone hybrid power systems. Therefore, the flexibility of the conventional power system should be assessed before, to accommodate and compensate for the variable renewable power penetration. In this thesis, a novel method is introduced to economically dispatch the generating units of the Standalone Hybrid Power System (SHPS), while ensuring the power system security. This method considers (a). the efficiency curve of Gas Turbine (GT) to simulate the robust real world scenario, (b). the Rate of Change of Frequency (ROCOF) and Spinning Reserves (SR) constraints to enhance the system security by restricting the frequency deviation during the contingency events, and (c). the flexibility analysis of the conventional standalone power system of an OG platform to access the ability of the power system to accommodate the demand and RE variations. A novel method has been developed and implemented in a Python-based tool, LGridPy. This method adopts the Mixed-Integer Nonlinear Programming (MINLP) technique to minimize the overall operational cost (including fuel, startup, shut-down, and maintenance cost) of the power system for the Economic Dispatch (ED) problem. It uses the MindtPy solver, which leverages the Gurobi solver for the MINLP and the IPOPT solver for the NLP. The new method considers various Key Performance Indicators (KPIs) and flexibility indicators for the power system model, to access the response of the system under different conditions and case studies.
 
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Publishing Date
2023-08-03
 
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