Browsing by Author "Ferreira, Silvia Costa"

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    Adaptive real-time power measurement based on IEEE standard 1459-2010.
    (2015) Ferreira, Silvia Costa; Gonzatti, Robson Bauwelz; Silva, Carlos Henrique da; Silva, Luiz Eduardo Borges da; Pereira, Rondineli Rodrigues; Torres, Germano Lambert
    This article presents the theoretical development and implementation of an adaptive algorithm for real-time measurement of electrical powers under sinusoidal, non-sinusoidal, balanced, and unbalanced conditions according to the definitions given by IEEE Standard 1459-2010. The algorithm is based on adaptive filter notch filter implementation, where the parameters are adjusted by tracking the amplitude and phase variations to improve the accuracy of the power measurement. The algorithm uses the filter coefficients to calculate powers, resulting in low computational burden. The results of computer simulation and practical implementation using a fixed-point digital signal controller are shown in detail, proving the accuracy and efficiency of the algorithm.
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    Filtros adaptativos aplicados em condicionadores de energia.
    (2014) Ferreira, Silvia Costa; Pereira, Rondineli Rodrigues; Gonzatti, Robson Bauwelz; Silva, Carlos Henrique da; Silva, Luiz Eduardo Borges da; Torres, Germano Lambert
    Este artigo apresenta uma comparação entre quatro algoritmos para a compensação do conteúdo harmônico e da potência reativa através de condicionadores de energia. Os quatro algoritmos testados são: o método da referência síncrona, o filtro adaptativo sintonizado utilizando PLL para gerar os sinais de referência, o filtro adaptativo sintonizado utilizando a Transformada de Clarke para gerar os sinais de referência e o filtro adaptativo sintonizado com estimador de frequência. O principal objetivo ´e demonstrar a habilidade dos filtros adaptativos em acompanhar as variações do sinal de entrada, sem a necessidade de um algoritmo de sincronismo, como o PLL. Os algoritmos foram simulados, implementados no DSP TMS320F2812 e testados diretamente em filtros ativos de potência. Diversos aspectos relativos ao tempo de execução, à velocidade de convergência e ao erro em regime permanente são apresentados.
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    Finite control set model predictive control for dynamic reactive power compensation with hybrid active power filters.
    (2017) Ferreira, Silvia Costa; Gonzatti, Robson Bauwelz; Pereira, Rondineli Rodrigues; Silva, Carlos Henrique da; Silva, Luiz Eduardo Borges da; Torres, Germano Lambert
    This work applies finite control set model predictive control (FCS-MPC) for dynamic reactive power compensation using a hybrid active power filter (HAPF). The FCS-MPC uses a model based on LCL-Filter equations to predict the system behavior and optimize the control action. In fact, the application of FCS-MPC in gridconnected converters with LCL-Filter is quite recent. This algorithm is a very promising control technique for power electronics converters and its use for reactive power control of hybrid filter has not been reported in the literature yet. This work uses the FCS-MPC in a multivariable structure along with an adaptive notch filter (ANF) to damp resonance. The main purpose is to improve the dynamic response of the HAPF. Simulation as well as practical results prove the feasibility of FCS-MPC application in HAPF reactive power control. The dynamic response of the equipment was significantly improved and represents the main contribution of this work. As a result, the FCS-MPC allows tracking fluctuations and abrupt changes in load reactive power.