Results 11 to 20 of about 189,381 (167)
IET Power ElectronicsThe occurrence of voltage variations caused by the input/output of large loads and/or transmission lines, as well as faults and high levels of photovoltaic‐based distributed energy resource (DER) penetration, impairs power quality indicators at the power
Matheus B. Soares +4 more
doaj +2 more sources
IET Microwaves, Antennas &Propagation, Volume 17, Issue 7, Page 547-557, June 2023., 2023 This study proposes an analytical formulation in complex coordinates to synthesise three‐dimensional single‐shell dielectric lens surfaces. An exact formulation based on geometrical optics is developed, and the synthesis problem is modelled as a non‐linear second‐order partial differential equation of the Monge–Ampère type. Abstract This study proposes
Aline Rocha de Assis +2 more
wiley +1 more source
Application of the Base Transceiver Station with Smart Antennas in the Power Distribution Sector
International Journal of Antennas and Propagation, Volume 2021, Issue 1, 2021., 2021 The use of distribution automation systems has grown significantly in electricity companies in recent years. The main reason for this is the need to have a smarter network, in order to reduce the time of power interruption. For such applications, communication using radio frequency is preferred because this solution is more reliable than 3G/4G and ...
B. A. Kleinau +7 more
wiley +1 more source
Fertirrigação e regulador de crescimento na produção de mudas de café em tubete [PDF]
, 2018 The use of quality seedlings is important in establishing a productive coffee crop. However, the most widely used method to produce coffee seedlings is time consuming (6-12 months) and lacks new production technologies.
Carvalho, Mychelle +4 more
core +5 more sources
Physicochemical characteristics of organic honey samples of africanized honeybees from Paraná River islands. [PDF]
, 2011 This research was carried out to evaluate the physicochemical composition of organic honey in Paraná River islands, in Porto Brasílio, State of Paraná. Honey was harvested directly from super of the colonies in three apiaries spread in the Floresta and ...
Alves, Eloi Machado +6 more
core +3 more sources
Eletrônica de Potência, 2013 Este artigo apresenta o desenvolvimento de um novo medidor de flicker baseado na análise direta da variação instantânea do fluxo luminoso. A proposta do medidor é baseada no Flickermeter IEC modificado, o que permite medir o flicker produzido por ...
Guilherme P. Colnago +2 more
doaj +1 more source
Poluição harmónica em instalações elétricas industriais [PDF]
, 2014 Qualidade de Energia Elétrica (QEE) pode ser definida como a ausência relativa de perturbações que afetem a correta operação de um qualquer equipamento ou instalação elétrica.
Carvalho, José António Beleza +1 more
core +2 more sources
Mercados de energia elétrica. Estratégias de comercialização de potência em mercado liberalizado [PDF]
, 2012 Em ambientes comerciais cada vez mais competitivos, caracterizados pela importância das redes comerciais, hipercompetição e pelo ciclo de vida de produtos e serviços, a inovação e o empreendedorismo são fundamentais para o sucesso das organizações ...
Carvalho, José Beleza
core +1 more source
Proposal Of A Hysteresis Controller With Constant Switching Frequency
Eletrônica de Potência, 2005 This paper introduces a new control technique for power factor correction in ac-dc converters. It has the advantages of conventional hysteresis control strategy and the prominent characteristics PWM control, since the limits of the hysteresis band can be
Marcos Tadeu Galelli +6 more
doaj +1 more source
Scalar Pulse Width Modulation Strategies For Matrix Converters
Eletrônica de Potência, 2007 This paper describes three different scalar pulse width modulation (PWM) techniques for matrix converters to be compared to two other scalar techniques proposed here.
A. G. H. Accioly +5 more
doaj +1 more source