Raphael L. A. Reis

In this letter, a new algorithm is proposed to improve frequency estimation for relaying applications. The key idea is to apply successive filtering stages whose parameters are adapted following the estimated frequency deviation. Its performance is compared against other algorithms reported in the literature. Results show that the proposed algorithm provides an accurate and fast frequency estimation.

This letter proposes a settings-free Pseudo-Incremental Normalized (PIN) quantity-based phase selection method, which is suitable for systems with conventional and inverter-based resources (IBRs). The proposed solution process voltage and current PIN components in the same way, being flexible for applications in weak and strong terminals. The proposed method is initially evaluated by means of PSCAD simulations with the aim to compare it against five other competing solutions. Then, real-world records are used to validate the proposed method application in actual fault scenarios. In both evaluation stages, faults on lines that interconnect IBRs to synchronous generator-dominated grids are considered, allowing to assess the proposed solution under the influence of conventional generations and IBRs. The obtained results attest that the proposed phase selection method is robust, flexible and reliable, being promising for systems with conventional generations and/or IBRs.

Este estudo apresenta uma Avaliação de Impacto Ambiental (AIA) da usina solar fotovoltaica de 1 MW localizada em Juazeirinho, Paraíba. Os objetivos buscam identificar e analisar os possíveis efeitos ambientais decorrentes da instalação e operação da usina, utilizando métodos de Checklist e Matriz de Interação. Dos estudos realizados, embora a operação da usina contribua para a redução das emissões de gases de efeito estufa e promoção da sustentabilidade ambiental, impactos significativos como a remoção de vegetação, a movimentação de solo e a falta de mitigação ambiental podem ter resultado em perda de habitat, erosão e degradação da qualidade do solo. Neste cenário, este trabalho destaca a importância de uma abordagem sistemática na AIA para garantir o desenvolvimento sustentável de projetos de energia solar.