About
113
Publications
27,739
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
390
Citations
Publications
Publications (113)
Retrofitting legacy systems provides significant advantages by addressing compatibility issues with new devices and technologies, meeting current process requirements, and increasing security and regulatory compliance. The process starts by collecting requirements and evaluating the legacy system’s attributes and limitations, followed by integratin...
Concepts such as "legacy system" and "brownfield system" emerge in the field of industrial automation and manufacturing, referring to older systems that can be updated or integrated with new technologies through a process called "retrofit". This process is aimed at improving the performance, connectivity, and integration of old systems with new tec...
This paper explores the use of ETC in DC-DC buck and boost converters connected to Constant Power Loads (CPLs). A co-design approach is proposed for developing event-based control strategies, aiming to minimize the frequency of events and maximize the interval between them. An optimization problem with Linear Matrix Inequality (LMI) constraints is...
This work investigates fractional-order control techniques applied to the speed, load, and frequency management of a high-capacity industrial gas turbine (heavy-duty). The aim is to optimize the turbine's response to fluctuations in load and generation, as well as to analyze fuel consumption. Two fractional approaches are employed to develop speed...
This article presents an analysis of the performance of classification algorithms Decision Tree Machine Learning, Random Forest, Gradient Boosting, Naive Bayes, Sequential Neural Network and Multilayer Perceptron for Malicious Attack Detection in cyber-physical systems with Internet of Things (IoT) networks with communication-based on Message Queui...
In recent years, the educational field has evolved rapidly owing to the integration of several technologies, especially experiments in remote laboratories in the engineering area. Therefore, this article addresses the development of an innovation system for automatically correcting experiments in remote laboratories in mechatronics using digital tw...
Direct current microgrids have aroused significant interest due to their operational efficiency and their ability to integrate with renewable energy sources. However, the presence of constant power loads represents a potential challenge to the stability of these systems, due to the negative incremental impedance effect. To assess stability in this...
This article aims to develop an application of classic robust control tools to electromobility in isolated communities in the Amazon. These isolated communities sometimes have no electricity supply from the conventional grid. The main difficulty is geographical accessibility, so in many communities, the only way to access and move people and cargo...
The diffusion of electric vehicles as a mode of transportation, supported by market growth despite the COVID-19 pandemic, highlights the appeal of the product and the transformation of the urban mobility cenary. This study proposes a probabilistic methodology for evaluating the hosting capacity of fast-charging electric vehicle charging stations wi...
The use of power converters to regulate voltage and power in electrical power systems has been attracting attention due to the increasing number of research and applications on renewable energy. The integration of these switched devices may cause instability and undesired oscillations depending on the operation conditions, such as when they feed co...
This paper presents a novel methodology that combines fractional-order control theory with robust control under a parametric uncertainty approach to enhance the performance of linear time-invariant uncertain systems with integer or fractional order, referred to as Fractional-Order Robust Control (FORC). In contrast to traditional approaches, the pr...
This paper presents two control design strategies for voltage regulation in a single inductor dual-output DC-DC buck converter system. Based on a nominal multiple input multiple output plant model and performance requirements, both a Linear Quadratic Regulator and a Decoupled PI control law are designed to control the power converter system under p...
This paper investigates the Sundaresan technique for modeling fractional order systems. Sundaresan, Prasad, and Krishnaswamy published this method in 1978 for modeling oscillatory and non-oscillatory systems based on the second-order integer transfer function. This technique is based on the transient response parameters. A problem of convergence of...
This paper presents two control design strategies for voltage regulation in a single inductor dual output (SIDO) DC-DC Buck converter system. Based on a nominal multiple input multiple output (MIMO) plant model and performance requirements, both an LQR and a decoupled PI control laws are designed to control the power converter system, under paramet...
O artigo apresenta uma abordagem inovadora ao propor a utilização de uma inteligência artificial (IA), representada pelo chatbot, como instrumento estratégico para potencializar a eficácia do programa de integridade (PI) em uma universidade pública. Esta pesquisa busca não somente facilitar o acesso à informação, mas também estimular a inovação e o...
In this paper, the practical application of automatic control techniques is performed to enhance the performance of the isochronous speed regulator of hydraulic turbines, thus making the electrical power system more efficient. To achieve this, the dynamic model of the 2kVA small-scale power system is employed for controller tuning. This system enco...
Currently, researchers and engineers have been dedicated to the development of more efficient and cost-effective implementation strategies to minimize the technical impacts caused by the connection of Electric Vehicle (EV) and Photovoltaic Distributed Generation (DGPV) in a Low-Voltage Distribution Network (LVDN). Although the embedded controls in...
Industry 4.0 is driving profound changes in the industry through solutions that enhance production and raise product quality. Technologies like IoT, CPS, Big Data, and Cloud Computing are reshaping business operations by integrating systems, creating smart factories, and enhancing efficiency. An example is the educational system CP Lab by Festo, ut...
The modernization of a legacy system through the retrofit process involves a comprehensive update of an older system, aiming to enhance features such as performance, security, and functionality. The proposed methodology seeks to align retrofitting with the core principles and requirements of Industry 4.0. This methodology provides a step-by-step gu...
This paper investigates a new automatic control technique with fractional order based on the analytical calculation of parameters using the gain margin and phase margin (GMPM). The objective is to evaluate the performance of this controller compared to conventional methods in a Power System Stabilizer (PSS) applied to a Power Electrical System in a...
Direct current microgrids have been extensively studied due to their efficiency and compatibility with renewable energy sources. However, the presence of constant power loads can lead to instabilities due to the negative incremental impedance characteristic of these loads. In this context, three control methods based on linear matrix inequalities w...
Decarbonization stimulates the increased penetration of photovoltaic (PV) systems and plug-in electric vehicles (PEV) in low-voltage (LV) distribution networks. However, the individual or combined PV and PEV massive connections may incur significant economic costs for distribution utilities due to technical issues caused by these connections. This...
This research work aims to develop a comprehensive methodology for retrofitting legacy industrial automation systems, encompassing hardware and software updates, testing, and validations, to ensure that the system aligns with current and future needs. The proposed methodology not only addresses the technical aspects but also takes into account the...
This paper aims to evaluate two machine learning techniques using low-frequency photoplethysmography (PPG) associated with motion sensors, accelerometers and gyroscopes, from wearable devices such as smartwatches in gesture recognition from the wrist and fingers motion. The applied method consider the application of second-order gradient calculatio...
DC microgrid systems can be represented by cascade converter systems. These types of systems are composed of constant power loads that can lead the system to instability. In this context, several stability criteria based on the forbidden region that evaluate the smallest mesh gain are used to assess the stability of the system. This work proposes t...
This work proposes a new method to use virtual reconfigurable stabilizers for stabilization and oscillation damping in DC-DC converters with constant power loads. This concept, inspired by reconfiguration blocks for fault hiding, is used in this paper for dealing with negative impedance effects while maintaining the operation with a controller prev...
In this paper, a new automatic control technique based on fractional-order systems is investi- gated to improve the performance of the Power Systems Stabilizer (PSS), making the Electric Power System (EPS) most efficient. For this, we used the dynamic model of the 10 kVA scaled-down generation system. Initially, two power system stabilizers are tun...
In this work, we approach the control of non-holonomic mobile robots. We designed a backstepping controller project focused on the trajectory tracking of mobile robots. Furthermore, an asymptotic stability analysis based on Lyapunov’s theory was presented to guarantee the robot’s stability from tracking errors. Initially, we reproduce a combined ki...
This paper aims to adapt the structure and design procedures of a power system stabilizer (PSS) to the context of the use of DC-DC converters to mitigate the oscillations due to connection of constant power loads (CPL). In this sense, a buck converter with voltage previously regulated by a controller is considered and based on the power variations...
In this article methodologies and implementations are investigated into the SIMO converter, with focus on systems with two outputs using centralized control strategies. The control system is based in Parametric Robust Control and LQR techniques, using states feedback for output regulation purposes. To obtain the dynamics of the plant in the desire...
This work presents the design of an output feedback dynamic controller applied in a generation system connected to the infinite bus. This controller aims to allocate the system poles in a desired region of the complex plane and minimize the relationship of norm-H2 and norm-H∞ to perform the damping of electromechanical oscillations. The proposed po...
The concept of Industry 4.0 is being widely implemented in all phases of industry and brings the proposal of possible solutions for more complex applications such as data flow, modelling, simulation of physical systems, safety, and security. Among the technologies related to Industry 4.0, we have the digital twin that is based on the physical model...
Industry 4.0 integrates a series of emerging technologies, such as the Internet of Things
(IoT), cyber-physical systems (CPS), cloud computing, and big data, and aims to improve operational efficiency and accelerate productivity inside the industrial environment. This article provides a series of information about the required structure to adopt In...
Nowadays, the use of renewable energy has made it possible creating new ways to generate electricity like photovoltaic generation, wind generation, hydro generation, and others. It is common to connect this generation system to a power storage device like batteries promoting the voltage regulation of the system using DC-DC power converters. By conn...
Nowadays, several ways of electric generation have been investigated, one of the most promising is the photovoltaic system. They are renewable systems because they use the energy of the Sun as an input, and they are also an alternative to the types of sources more polluting like the combustible ones. This system produces electric energy in DC forma...
Photovoltaic panels are devices that is used to supply energy via solar radiation. However, these panels depends on the stochastic variables, such as temperature and irradiance, and offer variable voltage levels during the the day and are sometimes found on the market with nominal voltage specification with low load values that require high power l...
The use of renewable energy sources in parallel with the development of power electronics enabled the development of DC microgrids. In this sense, this work carries out a review of classic control strategies applied to mitigate oscillations in a boost converter connected to CPL based on buck converter, where these strategies are applied to the boos...
Os paineis fotovoltaicos são dispositivos utilizados para fornecimento de energia por meio da radiação solar. Entretanto, por dependerem de variáveis estocásticas, como temperatura e irradiância, estes dispositivos oferecem níveis de tensões variáveis ao longo do dia e, por vezes, são encontrados em mercado com especificação nominal de tensão com b...
Recursos energéticos renováveis são soluções promissoras para uma futura crise energética global. Melhorar a eficiência da captação de energia e reduzir o custo de energia renovável são os principais objetivos para o desenvolvimento da tecnologia de eletrônica de potência. Para integrar os sistemas de geração e armazenamento de energia e regulação...
Um problema comum em sistemas de manufatura modernos é a recorrente necessidade de configuração das linhas montagem em função da mudança do produto, especialmente devido à chamada "costumização em massa". O desafio, portanto, é a rápida reconfiguração para permitir a produção de vários produtos customizados. Para isso, diversos paradigmas para a ma...
This study presents the design and evaluation of robust controllers, based on linear programming, Kharitonov's theorem and Chebyshev's theorem, in order to enhance the performance of a typical structure of multi-stage converters present in direct current (dc) systems. In such electric power distribution systems, point-of-load converters act as a co...
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 wi...
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 sphe...
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 stabil...
This study presents the design and evaluation of a robust controller, based on frequency-domain, in order to enhance the performance of dc-dc power converters under parametric uncertainties. This robust control approach takes into account all possible uncertainties in the system such as load and input voltage variations. Thereby, the robust control...
Automatic routines for Fault Detection and Diagnosis (FDD) are very important in industrial monitoring systems. However, false alarms potentially occur. High false alarm rates may lead to outages and consequent losses in the production process. To address such problem, a new FDD strategy based on type-2 fuzzy systems is proposed herein to minimize...
The use of renewable energy has enabled new ways of generating electricity by means of photovoltaic energy, wind energy, among others. In order to improve the voltage regulation, DC-DC converters are used. Modeling Buck converters and linearization around an operating point ensures proper operation of the drive as a voltage regulator or a power reg...
DC-DC switching power converters exhibit the important characteristic of almost-perfect regulation at the output terminals independent of the input perturbations. However, this characteristic reflects at the input terminal as a constant power load (CPL). Microgrids (MGs) consists of multiple converters to satisfy the different voltage levels that l...
DC-DC switching power converters exhibit the important characteristic of almost-perfect regulation at the output terminals independent of the input perturbations. However, this characteristic reflects at the input terminal as a constant power load (CPL). Microgrids (MGs) consists of multiple converters to satisfy the different voltage levels that l...