This work presents a non‐isolated DC–DC boost converter employing coupled inductors, a diode‐capacitor network, and a voltage multiplier cell (VMC). This converter allows extending the conversion ratio not only by increasing the turns ratio of the coupled inductor, but also by adding more networks and VMCs, resulting in a more flexible design approach. Unlike most coupled‐inductor‐based boost‐type converters reported in the literature, the topology presents an output stage whose current is non‐pulsating, which leads to reduced electromagnetic interference (EMI) levels. Other prominent advantages include the fact that the input current is non‐pulsating with low high‐frequency ripple, as well as the operation of the switch and output diode under soft‐switching condition. Experimental results obtained from a 200‐W prototype are presented and discussed to validate the theoretical assumptions, also showing that the converter has high efficiency over a wide load range.
This paper presents the development of a photovoltaic (PV) system to supply electric energy to a typical rural school in the countryside of the sunny Northern East of Brazil. The system is designed to supply a rural school for up to two days, even under minimum solar radiation conditions. The solar energy is captured by PV panels and stored in lead acid batteries. The solar battery charger (A boost converter) extracts the maximum power from the PV panels for any radiation. The load is supplied through a high gain boost converter (24 Vcc to 311 Vcc) and the entire system is controlled by a microcontroller, which runs the MPP algorithm, monitors the charge state of the batteries and controls the operation of the DC/DC boost converter according to the load demand.
Photovoltaic (PV) systems used in DC Nanogrids present prominent advantages associated with low maintenance need and operation costs. Owing to the low output voltage of the PV module, highly efficient high-voltage gain DC-DC converters are required for connection with the DC nanogrid. This work presents a novel DC-DC converter topology with current source characteristic for PV applications and current injection in DC nanogrids. The introduced converter uses coupled inductors and switched capacitors to achieve high voltage gain with low component count and without using extreme duty ratios. Besides, the main switch is turned on with nearly zero current, thus contributing to minimized switching losses. The qualitative and quantitative analyzes of the circuit are presented in detail and a prototype rated at 200 W is developed and evaluated in the laboratory. Experimental results demonstrate efficient renewable energy conversion, where the maximum efficiency is 96.8%.
O Brasil passou por um período de crise energética no último ano de 2021, devido às baixas dos rios que abastecem as hidrelétricas, sendo obrigado a acionar as usinas térmicas para o abastecimento de energia elétrica da população brasileira. Essa crise energética trás vários aspectos negativos, que podem ser evitados ou parcialmente evitados com a utilização de previsões que podem ajudar na tomada de decisões por parte dos Operadores do Sistema de Energia Elétrica. Dentro desta perspectiva este trabalho tem como objetivo principal prever a geração de energia elétrica renovável do estado do Ceará (CE) em um período de três dias à frente, através do modelo de previsão Prophet, algoritmo utilizado em grande escala pela rede social Facebook, utilizando dados de geração de energia elétrica extraído do site do Operador Nacional do Sistema (ONS). Os dados foram coletados de 01 de novembro de 2018 a 01 de março de 2021, totalizando 852 medições considerando intervalos diários. As previsões foram avaliadas pelas métricas de avaliação de modelos: RMSE, MSE e MAPE. Os dados foram divididos em 75% de dados de treinamento e 25% em dados de testes. Como resultado, observou-se que o modelo obteve um erro 5,5% levando em consideração a métrica MAPE.
Distributed solar photovoltaic (PV) generation is becoming more popular. Similarly, the number of electronic loads has increased along with the need to improve power quality. The PV-Shunt Active Filter (PV-SAF) is a system capable of injecting the PV power generated in the electrical grid and eliminating harmonics of current and reactive power of the local installation load. In the single-stage topology, the PV array is connected directly to the SAF DC bus, without the need for an intermediate DC-DC converter. In this paper, a three-phase single-stage PV-SAF system is evaluated in partial shading conditions. For this,
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