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Abstract(s)
Com o crescente interesse e utilização da microgeração fotovoltaica tem surgido a necessidade de avaliar o seu impacto nalguns indicadores de Qualidade de Energia Eléctrica (Q.E.E), especialmente na Taxa de Distorção Harmónica (THD), numa rede eléctrica de baixa tensão (BT) rural.
Inicialmente neste trabalho apresenta-se um resumo, com o propósito de enquadramento, da legislação portuguesa referente à produção de energia por via de fontes de energia renovável.
Posteriormente são simulados e dimensionados todos os componentes da rede, para que a simulação final esteja o mais próximo possível da realidade no terreno.
Após a representação detalhada das cargas mais significativas presentes na rede eléctrica, assim como os seus elementos constituintes, foi construído um modelo da rede na plataforma Matlab/Simulink para assim se poderem analisar os parâmetros da rede, nomeadamente a THD das correntes (THDI) e das tensões (THDu) e assim podermos verificar se os seus valores estão ou não de acordo com o recomendado pela norma NP 50160 (THDu≤8%).
Com base nas simulações efectuadas verifica-se que o valor da THDu nunca ultrapassa o valor definido pela norma NP 50160, no entanto o mesmo piora com a introdução das Unidades de Microgeração (UM).
The growing interest and use of photovoltaic microgeneration has arisen the need to assess its impact on some indicators of the Power Quality (Q.E.E), especially the Total Harmonic Distortion rate (THD) on a low voltage rural network. The first part of this work presents a summary of Portuguese legislation on electricity production from renewable energy sources. Subsequently are simulated and dimensioned all network components so that the final simulation is as close as possible to reality. After detailed representation of the most significant loads present in the electrical network, as well as its components, a model was built on Matlab/Simulink software to thereby be able to analyze the network parameters, such as the current and tension THD (THDI ; THDu) so we can verify that the values are or are not in accordance with the recommendations of the NP 50160 (THDu≤8%). Based on simulations it is found that the value of THDU never exceeds the value set by NP 50160, however it worsens with the introduction of Microgeneration Units (MU).
The growing interest and use of photovoltaic microgeneration has arisen the need to assess its impact on some indicators of the Power Quality (Q.E.E), especially the Total Harmonic Distortion rate (THD) on a low voltage rural network. The first part of this work presents a summary of Portuguese legislation on electricity production from renewable energy sources. Subsequently are simulated and dimensioned all network components so that the final simulation is as close as possible to reality. After detailed representation of the most significant loads present in the electrical network, as well as its components, a model was built on Matlab/Simulink software to thereby be able to analyze the network parameters, such as the current and tension THD (THDI ; THDu) so we can verify that the values are or are not in accordance with the recommendations of the NP 50160 (THDu≤8%). Based on simulations it is found that the value of THDU never exceeds the value set by NP 50160, however it worsens with the introduction of Microgeneration Units (MU).
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Keywords
Redes de baixa tensão Sistema de registo de microprodução Taxa de distorção harmónica Energia eléctrica