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Florindo Ayres Junior
Department of Electricity, Federal University of Amazonas, Avenida General Rodrigo Octavio, 6200, Coroado I, 69077-000, Manaus, AM, Brazil

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Journal article
Published: 04 August 2020 in ISA Transactions
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In this work, a novel methodology for tuning fractional order controller, so-called fractional order pole placement (FOPP) is proposed. The proposed methodology extends classical (integer order) pole placement technique, using commensurable transfer functions for representing fractional order controllers and placing the fractional dominant poles within an extended stability region based on three terms fractional transfer functions. The designed fractional order controller can be digitally implemented by using the Oustaloup integer approximation of the fractional order dynamics with Hankel model reduction. The proposed FOPP is used to design fractional order controllers for a DC/DC buck converter. The experimental tests include comparisons between the proposed FOPP and other tuning methodologies for integer and fractional order controllers for the DC/DC buck converter that is subject to load, parametric, and load variations. Integral indices are computed to aid the assessment of the control strategies with respect to the robustness, performance specification compliance, and control effort. The results show that the proposed method outperforms the other approaches when occurs the variations.

ACS Style

Florindo A. De C. Ayres; Iury Valente de Bessa; Vinicius Matheus Batista Pereira; Nei Junior Da Silva Farias; Alessandra Ribeiro de Menezes; Renan L.P. de Medeiros; João Edgar Chaves; Marcelo K. Lenzi; Carlos Tavares da Costa. Fractional Order Pole Placement for a buck converter based on commensurable transfer function. ISA Transactions 2020, 107, 370 -384.

AMA Style

Florindo A. De C. Ayres, Iury Valente de Bessa, Vinicius Matheus Batista Pereira, Nei Junior Da Silva Farias, Alessandra Ribeiro de Menezes, Renan L.P. de Medeiros, João Edgar Chaves, Marcelo K. Lenzi, Carlos Tavares da Costa. Fractional Order Pole Placement for a buck converter based on commensurable transfer function. ISA Transactions. 2020; 107 ():370-384.

Chicago/Turabian Style

Florindo A. De C. Ayres; Iury Valente de Bessa; Vinicius Matheus Batista Pereira; Nei Junior Da Silva Farias; Alessandra Ribeiro de Menezes; Renan L.P. de Medeiros; João Edgar Chaves; Marcelo K. Lenzi; Carlos Tavares da Costa. 2020. "Fractional Order Pole Placement for a buck converter based on commensurable transfer function." ISA Transactions 107, no. : 370-384.

Journal article
Published: 24 July 2020 in Energies
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This paper presents a novel direct form to design a digital robust control using RST structure (i.e., name given because of the R, S and T polynomials computed) based on convex optimization such as Chebyshev sphere; this approach was applied to a DC-DC Buck converter. This methodology takes into account parametric uncertainties and a Chebyshev sphere constraint in order to ensure robust performance and stability of the system in the discrete domain. For this purpose, a mathematical model for the DC-DC Buck converter is presented when considering uncertainties in electrical variables, such as load resistance, inductance, capacitance, and source voltage variation, also to obtain the discrete model of the system by using the bilinear transformation. The proposed methodology is compared with two other approaches designed in a discrete domain: the classical pole placement and the robust methodology based on the Kharitonov theorem. Wide-ranging experiments are performed in order to evaluate the behavior of the control methodologies when the system is subject to parametric variations of the load resistance and voltage setpoint variation. The results show that the proposed methodology outperforms the other approaches in 90% of the tests and ensures robust stability and robust performance when the system is subjected to a parametric uncertainties family.

ACS Style

Cleonor Das Neves; Walter B.; Renan De Medeiros; Florindo Ayres Junior; Iury Bessa; Isaías Bessa; Gabriela De M. Veroneze; Luiz E Silva; Nei Farias. Direct Form Digital Robust RST Control Based on Chebyshev Sphere Optimization Applied in a DC-DC Power Converter. Energies 2020, 13, 3810 .

AMA Style

Cleonor Das Neves, Walter B., Renan De Medeiros, Florindo Ayres Junior, Iury Bessa, Isaías Bessa, Gabriela De M. Veroneze, Luiz E Silva, Nei Farias. Direct Form Digital Robust RST Control Based on Chebyshev Sphere Optimization Applied in a DC-DC Power Converter. Energies. 2020; 13 (15):3810.

Chicago/Turabian Style

Cleonor Das Neves; Walter B.; Renan De Medeiros; Florindo Ayres Junior; Iury Bessa; Isaías Bessa; Gabriela De M. Veroneze; Luiz E Silva; Nei Farias. 2020. "Direct Form Digital Robust RST Control Based on Chebyshev Sphere Optimization Applied in a DC-DC Power Converter." Energies 13, no. 15: 3810.

Journal article
Published: 25 May 2020 in Energies
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The DC microgrid system is composed by converters that operate like feeders and loads. Among these loads, we highlight the constant power loads (CPLs) that may cause instability in the microgrid, observed in the form of undesired oscillations due to its negative impedance behavior. Therefore, this work proposes to use performance indices and stability margins to evaluate state and output feedback control strategies for stabilization of DC microgrids. In particular, it is proposed to evaluate the stability margin of the proposed methodologies by means of the impedance relations in the microgrid based on the Middlebrook criterion. Our simulations and tests showed the relation between the performance and stability degradation and the microgrid impedances variation.

ACS Style

Isaías V. De Bessa; Renan L. P. De Medeiros; Iury Bessa; Florindo A. C. Ayres Junior; Alessandra R. De Menezes; Gustavo M. Torres; João Edgar Chaves Filho. Comparative Study of Control Strategies for Stabilization and Performance Improvement of DC Microgrids with a CPL Connected. Energies 2020, 13, 2663 .

AMA Style

Isaías V. De Bessa, Renan L. P. De Medeiros, Iury Bessa, Florindo A. C. Ayres Junior, Alessandra R. De Menezes, Gustavo M. Torres, João Edgar Chaves Filho. Comparative Study of Control Strategies for Stabilization and Performance Improvement of DC Microgrids with a CPL Connected. Energies. 2020; 13 (10):2663.

Chicago/Turabian Style

Isaías V. De Bessa; Renan L. P. De Medeiros; Iury Bessa; Florindo A. C. Ayres Junior; Alessandra R. De Menezes; Gustavo M. Torres; João Edgar Chaves Filho. 2020. "Comparative Study of Control Strategies for Stabilization and Performance Improvement of DC Microgrids with a CPL Connected." Energies 13, no. 10: 2663.

Journal article
Published: 01 October 2019 in DYNA
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En este artículo se pretende llevar a cabo una evaluación experimental de la utilización de técnicas de asignación de polos en el control Fuzzy aplicadas al flujo de CC en un sistema fotovoltaico autónomo, con el fin de garantizar una condición de estabilidad y un determinado rendimiento para la operación del sistema. Es presentado en la primera etapa del trabajo un modelo matemático que describe adecuadamente el comportamiento dinámico en cuestión fue linealizado el sistema en torno a un punto de operación haciendo uso de las series de Taylor, seguido por el análisis en un ambiente computacional del modelo linealizado del sistema fotovoltaico. Posteriormente, se evaluó de manera experimental el comportamiento dinámico en lazo abierto del sistema fotovoltaico autónomo, observando sus principales variables eléctricas (voltaje y corriente eléctrica). En la segunda etapa del trabajo, se investigó experimentalmente la aplicación de las técnicas de diseño de controladores PI clásico y controladores Fuzzy, con el objetivo de evaluar el comportamiento dinámico del sistema en lazo cerrado y garantizar la estabilidad de este, para pruebas en la variación del voltaje de referencia. Por fin, se presentaron los resultados de la evaluación experimental que demostró un mejor desempeño del controlador Fuzzy en comparación al controlador proyectado por la metodología clásica, cuando utilizada una planta fotovoltaica autónoma

ACS Style

Cleonor Crescêncio Das Neves Das Neves; Renan Landau Paiva De Medeiros; Walter Barra Junior Barra Junior; Florindo Antônio De Carvalho Ayres Junior Ayres Junior; Felipe Kioshi Yoshino Yoshino; Adrian Eduardo Gonzalez Barreda. Evaluación experimental del rendimiento de los controladores Fuzzy aplicados en un sistema fotovoltaico autónomo. DYNA 2019, 86, 354 -362.

AMA Style

Cleonor Crescêncio Das Neves Das Neves, Renan Landau Paiva De Medeiros, Walter Barra Junior Barra Junior, Florindo Antônio De Carvalho Ayres Junior Ayres Junior, Felipe Kioshi Yoshino Yoshino, Adrian Eduardo Gonzalez Barreda. Evaluación experimental del rendimiento de los controladores Fuzzy aplicados en un sistema fotovoltaico autónomo. DYNA. 2019; 86 (211):354-362.

Chicago/Turabian Style

Cleonor Crescêncio Das Neves Das Neves; Renan Landau Paiva De Medeiros; Walter Barra Junior Barra Junior; Florindo Antônio De Carvalho Ayres Junior Ayres Junior; Felipe Kioshi Yoshino Yoshino; Adrian Eduardo Gonzalez Barreda. 2019. "Evaluación experimental del rendimiento de los controladores Fuzzy aplicados en un sistema fotovoltaico autónomo." DYNA 86, no. 211: 354-362.

Journal article
Published: 08 August 2018 in Energies
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In this paper, a Fractional Order Power System controller (FOPSS) is designed, and its performance and robustness are experimentally evaluated by tests in a 10 kVA laboratory scale power system. The FOPSS design methodology is based on the tuning of an additional design variable, namely the fractional order of the controller transfer function. This design variable is tuned aiming to obtain a tradeoff between satisfactory damping of dominant oscillating mode and improved closed-loop system robustness. For controller synthesis, transfer function models were estimated from data collected at selected operating points and subsequently applied for the controller design and for obtaining upper bounds estimates on the operating-point depends on plant uncertainties. The experimental results show that the FOPPS was able to obtain a robust performance for the considered set of the power system operating conditions.

ACS Style

Florindo A. De C. Ayres Junior; Carlos T. Da Costa Junior; Renan L. P. De Medeiros; Walter Barra Junior; Cleonor C. Das Neves; Marcelo K. Lenzi; Gabriela De M. Veroneze. A Fractional Order Power System Stabilizer Applied on a Small-Scale Generation System. Energies 2018, 11, 2052 .

AMA Style

Florindo A. De C. Ayres Junior, Carlos T. Da Costa Junior, Renan L. P. De Medeiros, Walter Barra Junior, Cleonor C. Das Neves, Marcelo K. Lenzi, Gabriela De M. Veroneze. A Fractional Order Power System Stabilizer Applied on a Small-Scale Generation System. Energies. 2018; 11 (8):2052.

Chicago/Turabian Style

Florindo A. De C. Ayres Junior; Carlos T. Da Costa Junior; Renan L. P. De Medeiros; Walter Barra Junior; Cleonor C. Das Neves; Marcelo K. Lenzi; Gabriela De M. Veroneze. 2018. "A Fractional Order Power System Stabilizer Applied on a Small-Scale Generation System." Energies 11, no. 8: 2052.

Journal article
Published: 01 July 2018 in Eletrônica de Potência
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ACS Style

Renan Landau Paiva De Medeiros; Duaymy Bruno Rodrigues Góes; Florindo Antônio De Carvalho Ayres Junior; Walter Barra Junior; Cleonor Crescêncio Das Neves; Erick Melo Rocha. EXPERIMENTAL ASSESSMENT OF A ROBUST CONTROLLER DESIGN VIA INTERVAL ANALYSIS APPLIED TO A DC-DC BUCK CONVERTER. Eletrônica de Potência 2018, 23, 1 -11.

AMA Style

Renan Landau Paiva De Medeiros, Duaymy Bruno Rodrigues Góes, Florindo Antônio De Carvalho Ayres Junior, Walter Barra Junior, Cleonor Crescêncio Das Neves, Erick Melo Rocha. EXPERIMENTAL ASSESSMENT OF A ROBUST CONTROLLER DESIGN VIA INTERVAL ANALYSIS APPLIED TO A DC-DC BUCK CONVERTER. Eletrônica de Potência. 2018; 23 (3):1-11.

Chicago/Turabian Style

Renan Landau Paiva De Medeiros; Duaymy Bruno Rodrigues Góes; Florindo Antônio De Carvalho Ayres Junior; Walter Barra Junior; Cleonor Crescêncio Das Neves; Erick Melo Rocha. 2018. "EXPERIMENTAL ASSESSMENT OF A ROBUST CONTROLLER DESIGN VIA INTERVAL ANALYSIS APPLIED TO A DC-DC BUCK CONVERTER." Eletrônica de Potência 23, no. 3: 1-11.

Journal article
Published: 01 July 2016 in DYNA
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En este se investiga el modelado de un sistema del tipo correa transportadora con la finalidad de uso en el monitoreo y en el diagnóstico de faltas. Primeramente es discutido un modelo fenomenológico del proceso, el cual es basado en la aplicación de las leyes de la mecánica y considerando los diversos tipos de fuerza de oposición al movimiento que actúan sobre la correa. Los principales parámetros del transportador fueron estimados utilizando técnicas de identificación basadas en Mínimos Cuadrados No Recursivos. Los resultados obtenidos en estudios computacionales muestran el buen desempeño de la estrategia propuesta, cuando aplicada a datos reales colectados en el sistema de transporte de minerales de una mina de cobre al sur de Pará, Brasil.

ACS Style

Renan Landau Paiva De Medeiros; Walter Barra Júnior; José Ruben Sicchar; Florindo Antônio De Carvalho Ayres Júnior; José Augusto Lima Barreiros. Modelado fenomenológico e identificación paramétrica aplicada al monitoreo de una correa transportadora en una mina de cobre. DYNA 2016, 83, 110 .

AMA Style

Renan Landau Paiva De Medeiros, Walter Barra Júnior, José Ruben Sicchar, Florindo Antônio De Carvalho Ayres Júnior, José Augusto Lima Barreiros. Modelado fenomenológico e identificación paramétrica aplicada al monitoreo de una correa transportadora en una mina de cobre. DYNA. 2016; 83 (198):110.

Chicago/Turabian Style

Renan Landau Paiva De Medeiros; Walter Barra Júnior; José Ruben Sicchar; Florindo Antônio De Carvalho Ayres Júnior; José Augusto Lima Barreiros. 2016. "Modelado fenomenológico e identificación paramétrica aplicada al monitoreo de una correa transportadora en una mina de cobre." DYNA 83, no. 198: 110.