Contribuições à modelagem e análise de fluxo de carga de redes elétricas com geração distribuída fotovoltaica
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| 1. autor: | |
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| Data wydania: | 2020 |
| Format: | Master thesis |
| Język: | por |
| Źródło: | Repositório Institucional da UFG |
| Download full: | http://repositorio.bc.ufg.br/tede/handle/tede/10550 |
Streszczenie: | This work presents new contributions to the modeling of photovoltaic panels and the analysis of power systems by means of load flow, with emphasis on distribution networks with associated distributed generation. Such contributions consist of: (a) an equivalent parameter estimation method for photovoltaic cells and panels, which possesses greater accuracy in comparison to similar methods in the literature; (b) matrix equations for the power-mismatch Newton-Raphson load flow algorithm, which provides concise notation for polyphase load flow and reduces execution time due to usage of matrix operations; and (c) a method for the approximate computation of neutral voltages in three-phase systems, whose advantage consists in reducing the computational complexity associated to the study of neutral-earth voltages as functions of grounding impedances. All proposed methods are validated by means of computer simulations based on real data pertaining to distribution networks; the obtained results are compared to those provided by different methods in the literature. In order to expand the analysis to distribution grids with penetration of distributed photovoltaic generation, the simulations are carried out via the Monte Carlo method, by means of which the randomness of power injection and allocation of generators is emulated. The results confirm the validity of the proposed methods and suggest their applicability to problems involving photovoltaic panels and/or load flow in grids with distributed generation. |