Conversor Cc-ca Trifásico Com Comutação Em Baixa Frequência E Baixa Distorção HarmÈnica

Conversor CC-CA trifásico com comutação em baixa frequência e baixa distorção harmônica, caracterizado pelo fato de que o conversor CC-CA trifásico ora tratado utiliza um circuito que é uma estrutura em ponte, possuindo seis transistores, que podem ser do tipo bipolar, IGBT, MOSFET, ou qualquer outro tipo de interruptor controlável na condução e no bloqueio, e seis diodos em antiparalelo, fazendo a condução de corrente no sentido oposto ao dos transistores; os interruptores sendo denominados de T1 a T6. Adiciona-se um circuito auxiliar composto por interruptores bidirecionais eletrolíticos, tendo como função melhorar a forma de onda.BR0201377H02M1/12H02M1/14H02M1/12H02M1/14BR20020201377H02M1/12H02M1/14H02M1/12H02M1/1

Método De Controle Para Sistema De Armazenamento De Energia Elétrica Hìbrido

MÉTODO DE CONTROLE PARA SISTEMA DE ARMAZENAMENTO DE ENERGIA ELÉTRICA HÍBRIDO. A presente invenção trata de um método de controle para um sistema de armazenamento de energia elétrica híbrida composta por bateria e ultracapacitor. O método tem como finalidade o controle de conversores eletrônicos de modo a realizar a divisão da demanda de potência entre as os dispositivos de armazenamento de forma a melhorar o desempenho (por exemplo, aceleração e autonomia se aplicada em um veículo elétrico) e a vida útil das baterias.BRPI1000319 (A2)B60L15/10B60L11/18BR2010PI00319B60L15/10B60L11/1

Passive filter aided by shunt compensators based on the conservative power theory

Passive filters are widely used in electrical system for power quality improvements. Their first installations from 1940 s and their advantages make them an attractive and standard solution up to nowadays. However, passive filters have their filtering characteristics deteriorated due to parameter variation caused by aging or temperature. In addition, a capacitor bank for power factor correction is designed for specific loads and may not supply the right amount of reactive power when loads keep being added or changed. When these issues make the passive filter and the capacitor bank incapable to keep the system operating within acceptable level of power quality, an inconvenience arises and a solution must be provided. A common one is to replace both of them either by new elements or by active power compensators. However, replacing the passive filter and the capacitor bank may not be economically feasible, because they belong to a past investment. This paper presents a solution to overcome such inconvenience keeping the passive filter and the capacitor bank installed and unchanged. It consists of installing two shunt compensators specially designed for performing what the passive filter and the capacitor bank are incapable to do. The result is a reduced processed power in the compensators. The generation of the references is based on conservative power theory (CPT). A case study is presented to prove the compensators' efficacy and the power quality improvement52433403347CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP303036/2010-92012/23914-5Conference on Clemson-University Power Systems (PSC

Control of single-phase power converters connected to low-voltage distorted power systems with variable compensation objectives

This paper presents a flexible control technique for power electronics converters, which can function as an active power filter, as a local power supply interface, or perform both functions simultaneously. Thus, it can compensate for current disturbances while simultaneously injecting active power into the electrical grid, transforming the power converter into a multifunctional device. The main objective is to use all the capacity available in the electronic power converter to maximize the benefits when it is installed in the electricity grid. This objective is achieved by using the orthogonal current decomposition of the conservative power theory. Each current component is weighted by compensation coefficients (k(i)), which are adjusted instantaneously and independently, in any percentage, by means of load conformity factors (lambda(i)), thus providing online flexibility with respect to the objectives of compensation and injection of active power. Finally, simulated and experimental results are presented to validate the effectiveness and performance of the proposed approach31320392052CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPnão temnão tem2011/15884-6; 2013/08545-

Three/Four-leg Inverter Current Control Based on Generalized Symmetrical Components

Considering a scenario of high penetration of voltage source inverters in distribution grids, on which the number of conductors is variable, this paper proposes a current control approach for three- or four-leg inverters based on the generalized symmetrical components decomposition of non-sinusoidal signals. The approach is an alternative to d-q and α-β transformation-based approaches and allows to model and design the control system directly in the abc frame. Simulation results of three- and four-leg inverters operating as multifunctional interfaces of distributed energy resources are presented, as well as comparative results of the proposed approach and other abc frame-based approaches to control four-leg inverters

Optimized compensation of unwanted current terms by AC power converters under generic voltage conditions

This paper formulates an optimization-based algorithm for the compensation of unwanted current terms by means of distributed electronic power converters, such as active power filters and grid-connected inverters. The compensation goal consists in achieving suitable load conformity factors, defined at the source side and within a feasible power region in terms of the power converter capability. Based on the measured load quantities and on a certain objective function, the algorithm tracks the expected source currents, which are thereupon used to calculate proper scaling coefficients and, therefore, the compensation current references. It improves the power quality at the point of common coupling and enables full exploitation of distributed energy resources, increasing their efficiency. The compensation is based on a decoupled current decomposition and on an optimization-based algorithm. In this paper, the strategy is applied to nonlinear and unbalanced three-phase four-wire circuit, under nonsinusoidal and asymmetrical voltage conditions. The steady-state and dynamic behaviors have been analyzed by theoretical, simulation, and experimental results. Furthermore, the proposed approach is also compared to other compensation strategies showing its effectiveness631277437753CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP302257/2015-2; 487471/2012-12012/24309-8; 2013/08545-6; 2014/23691-