Estudo de propagação harmônica em redes de distribuição considerando a característica estocástica das cargas

Detalhes bibliográficos
Ano de defesa: 2015
Autor(a) principal: Marcio Melquiades Silva
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Minas Gerais
UFMG
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/1843/BUBD-A2DP6F
Resumo: The main aim of the thesis is to formulate and develop of a new methodology for modelling and handling with aggregated harmonic loads and linear loads in harmonic power flow analysis. This method, so-called Variable Load Method, can be used in balanced and unbalanced systems and for deterministic and stochastic studies. The main types of harmonic loads and their participation coefficients inside the facility are estimated by inspection or based on usual values. In addition, a new type of load model that represents the load variation and minor loads is also defined based on field measurements, in order to build a more adherent harmonic load representation. A stochastic analysis, based on Monte Carlo simulations, is also performed. This sequence of steps makes possible to evaluate if the harmonic distortion has a significant probability of exceeding the limits set by standards due to load variations. This analysis is performed jointly with the bootstrapping method for obtaining the probability density functions of the voltage harmonic distortions. Tests in real plants show that the proposed approach is able to represent measured data with high precision. For these studies new software was development in Matlab environment with graphical interface. The program allows the study of harmonic propagation in radial electric network, in both balanced and in unbalanced networks, and showed similar results to the other referral program when simulating typical IEEE systems. The program also allows multiple simulations using different loads to the same network settings obtained at random. Simulation of cases examples shows realistic results.