856 resultados para Power system state estimation
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
                                
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The transmission expansion planning problem in modern power systems is a large-scale, mixed-integer, nonlinear and non-convex problem. this paper presents a new mathematical model and a constructive heuristic algorithm (CHA) for solving transmission expansion planning problem under new environment of electricity restructuring. CHA finds an acceptable solution in an iterative process, where in each step a circuit is chosen using a sensitivity index and added to the system. The proposed model consider multiple generation scenarios therefore the methodology finds high quality solution in which it allows the power system operate adequacy in an environment with multiple generators scenarios. Case studies and simulation results using test systems show possibility of using Constructive heuristic algorithm in an open access system.
                                
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Faced with an imminent restructuring of the electric power system, over the past few years many countries have invested in a new paradigm known as Smart Grid. This paradigm targets optimization and automation of electric power network, using advanced information and communication technologies. Among the main communication protocols for Smart Grids we have the DNP3 protocol, which provides secure data transmission with moderate rates. The IEEE 802.15.4 is another communication protocol also widely used in Smart Grid, especially in the so-called Home Area Network (HAN). Thus, many applications of Smart Grid depends on the interaction of these two protocols. This paper proposes modeling, in the traditional network simulator NS-2, the integration of DNP3 protocol and the IEEE 802.15.4 wireless standard for low cost simulations of Smart Grid applications.
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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Pós-graduação em Engenharia Elétrica - FEIS
                                
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This paper presents a mixed-integer convex-optimization-based approach for optimum investment reactive power sources in transmission systems. Unlike some convex-optimization techniques for the reactive power planning solution, in the proposed approach the taps settings of under-load tap-changing of transformers are modeled as a mixed-integer linear set equations. Are also considered the continuous and discrete variables for the existing and new capacitive and reactive power sources. The problem is solved for three significant demand scenarios (low demand, average demand and peak demand). Numerical results are presented for the CIGRE-32 electric power system.
                                
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Pós-graduação em Engenharia Elétrica - FEB
                                
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Pós-graduação em Engenharia Elétrica - FEIS
 
                    