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The growing integration of renewable energy sources, such as photovoltaic and wind systems, into energy grids has underscored the need for reliable control mechanisms to mitigate the inherent intermittency of these sources. According to the Brazilian grid operator (ONS), there have been cascading disconnections in renewable energy distributed systems (REDs) in recent years, highlighting the need for robust control models. This article addresses this issue by presenting the validation of an active power ramp rate control (PRRC) function for a PV plant coupled with a Battery Energy Storage System (BESS) using WECC generic models. The proposed model underwent rigorous validation over an extended analysis period, demonstrating good accuracy using the Root Mean Squared Error (RMSE) and an R-squared (R2) metrics for the active power injected at the Point of Connection (POI), PV active power, and BESS State of Charge (SOC), providing valuable insights for medium and long-term analyses. The ramp rate control module was implemented within the plant power controller (PPC), leveraging second-generation Renewable Energy Systems (RES) models developed by the Western Electricity Coordination Council (WECC) as a foundational framework. We conducted simulations using the Anatem software, comparing the results with real-world data collected at 100 ms to 1000 ms intervals from a PV plant equipped with a BESS in Brazil. The proposed model underwent rigorous validation over an extended analysis period, with the presented results based on two days of measurements. The positive sequence model used to represent this control demonstrated good accuracy, as confirmed by metrics such as the Root Mean Squared Error (RMSE) and R-squared (R2). Furthermore, the article underscores the critical role of accurately accounting for the power sampling rate when calculating the ramp rate. [ABSTRACT FROM AUTHOR]

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This article presents the results of a simulation of the electrical system of the "Corveta Classe Barroso" or CCB, a ship in the Brazilian Navy, using the MATLAB program. The objective of the simulation is to measure, evaluate, and mitigate the harmonics at the output terminals of the ship's generator group, driven by the non-linear loads connected to the Point of Common Coupling (PCC) of the distribution system, such as three-phase Static Rectifiers, Specific Loads, and a WaterCooling Unit. The simulation was divided into two stages, with the first stage simulating the system without the presence of the Shunt Active Power Filter (SAPF) and the second stage including the SAPF. The design of the SAPF was based on the IRP p-q theory, and it was found that the SAPF was effective in reducing current and voltage distortions, improving the true power factor, reducing harmonic pollution, and reducing voltage modulation. The results obtained during the second stage of the simulation that considered the presence of the SAPF indicated that the aforementioned filter was an adequate choice for improving the power quality of the ship under study. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Tecnologia Aplicada is the property of Faculdade Campo Limpo Paulista and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

As investments in photovoltaic distributed generations (PVDG) become more attractive, medium and low-voltage networks may be impacted by this intermittent source. In this sense, power quality studies are essential to ensure continuity and reliability in power supply, especially in priority loads, such as industries connected to the medium-voltage network. This paper aims to analyze the impacts on power quality of industries fed in medium-voltage (MV) for different penetration levels of intermittent PV generation installed in low-voltage (LV) networks. Two industries were modeled in different buses on IEEE 8500-node test system, simulated in the OpenDSS program. The analysis parameters are based on steadystate voltage, power factor, and voltage imbalance for each industry. The results show violation in steady-state voltage starting in 5.5 MW and 27.5 MW of PVDG penetration in the MV and LV buses, for both industries, respectively. In addition, voltage imbalance problems are seen in 100 % of PVDG penetration for the industry at the end of the feeder. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Tecnologia Aplicada is the property of Faculdade Campo Limpo Paulista and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)