Rosas-Caro, Julio
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Preferred name
Rosas-Caro, Julio
Official Name
Rosas Caro, Julio César
Alternative Name
crosas
Main Affiliation
ORCID
Scopus Author ID
57191227591
Researcher ID
R-6224-2018

Research Output
Now showing 1 - 10 of 122
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Publication

Implementation and Control of an Industrial Static VAr Compensator

2018 , R. Garcia-Rochin , J.C. Mayo-Maldonado , Rosas-Caro, Julio , J.E. Valdez-Resendiz

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Publication

Data-Driven Modeling of DC–DC Power Converters

2024 , Edgar D. Silva-Vera , Jesus E. Valdez-Resendiz , Gerardo Escobar , Daniel Guillen , Rosas-Caro, Julio , Jose M. Sosa

This article presents a data-driven methodology for modeling DC–DC power electronic converters. Using the proposed methodology, the dynamics of a converter can be captured, thereby eliminating the need for explicit theoretical modeling methods. This approach only requires the acquisition of fundamental measurements: currents through inductors and voltages across capacitors. The acquired data are used to construct a linear difference system, which is algebraically manipulated to form a state–space representation of the converter under analysis. Three DC–DC converter topologies were analyzed, and their resulting models were tested and compared with simulation data, yielding an average error deviation of approximately 2% for current signals and 4% for voltage signals, demonstrating precise tracking of the actual dynamics. The proposed data-driven methodology could simplify the implementation of adaptive control strategies in larger-scale solutions or in the interconnection of multiple converters.

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Adaptive neural strategies for the interactive tracking flight of two aerial vehicles

2018-01-01 , Yañez-Badillo H. , Tapia-Olvera R. , Beltran-Carbajal F. , Valderrabano-Gonzalez, Antonio , Rosas-Caro, Julio , Aguilar-Mejia O.

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Sliding Mode Speed Control in Synchronous Motors for Agriculture Machinery: A Chattering Suppression Approach

2024 , David Marcos-Andrade , Francisco Beltran-Carbajal , Ivan Rivas-Cambero , Hugo Yañez-Badillo , Antonio Favela-Contreras , Rosas-Caro, Julio

Synchronous motors have extended their presence in different applications, specifically in high-demand environments such as agronomy. These uses need advanced and better control strategies to improve energy efficiency. Within this context, sliding mode control has demonstrated effectiveness in electric machine control due to its advantages in robustness and quick adaptation to uncertain dynamic system disturbances. Nevertheless, this control technique presents the undesirable chattering phenomenon due to the discontinuous control action. This paper introduces a novel speed integral control scheme based on sliding modes for synchronous motors. This approach is designed to track smooth speed profiles and is evaluated through several numeric simulations to verify its robustness against variable torque loads. This approach addresses using electric motors for different applications such as irrigation systems, greenhouses, pumps, and others. Moreover, to address the chattering problem, different sign function approximations are evaluated in the control scheme. Then, the most effective functions for suppressing the chattering phenomenon through extensive comparative analysis are identified. Integral compensation in this technique demonstrates improvement in motor performance, while sign function approximations show a chattering reduction. Different study cases prove the robustness of this control scheme for large-scale synchronous motors. The simulation results validate the proposed control scheme based on sliding modes with integral compensation, by achieving chattering reduction and obtaining an efficient control scheme against uncertain disturbances in synchronous motors for agronomy applications.

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A Multilevel Boost Converter with Reduced Inductor Current

2023 , Rosas-Caro, Julio , Jesus E. Valdez-Resendiz , Gerardo Escobar , Francisco Beltran-Carbajal

DC–DC converters are gaining attention due to their importance in key applications like renewable energy generation. A desirable feature in new DC–DC converters is a reduction in the size, which can be achieved with a reduction in the energy stored in the inductors. This article introduces a new step-up DC–DC converter topology with the following advantages: (i) a larger relation of duty cycle vs. voltage gain compared with the classical boost topology and (ii) an inductor with smaller current and smaller inductance (for the same power conversion characteristics) compared to the traditional boost converter. The smaller inductor current is an advantage against many step-up topologies with the inductor in series with the input (and then the input and the inductor currents are equal). The necessary inductance to achieve a certain current ripple is also reduced compared to the classical boost topology. This results in an inductor with a smaller amount of stored energy, lower inductance, and lower current. The proposed topology can be scaled to have a full family of large-voltage-gain converters. This paper presents the mathematical analysis, simulations, and experiments to assess the benefits of the proposition.

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An Overview of Non-Isolated Hybrid Switched-Capacitor Step-Up DC–DC Converters

2022 , Rosas-caro, Julio , Mayo Maldonado, Jonathan , Jesus E. Valdez-Resendiz , Francisco Beltran-Carbajal , Alejo-Reyes, Avelina , Oswaldo López-Santos

The increasing interest in renewable energy sources has brought attention to large voltage-gain dc–dc converters; among the different available solutions to perform a large voltage-gain conversion, this article presents an overview of non-isolated dc–dc converter topologies that utilize switched-capacitor circuits, i.e., diode-capacitors voltage multipliers. The review includes combinations of a traditional power stage with a diode-capacitor-based voltage multiplier, such as the multilevel boost converter. This article starts by reviewing switched-capacitor (SC) circuits, different topologies, and different types of charge exchange; it provides a straightforward analysis to understand the discharging losses. It then covers the multilevel boost converter and other topologies recently introduced to the state-of-the-art. Special attention is put on SC circuits with resonant charge interchange that have recently been probed to achieve very good efficiency. An additional contribution of the article is new proof of the discharging losses in resonant switched-capacitor circuits focused on the initial and final stored energy in capacitors, and this proof explains the relatively large efficiency obtained with SC resonant converters.

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Detailed Modeling of the Low Energy Storage Quadratic Boost Converter

2021 , Oswaldo Lopezsantos , Nicolas Lopez Varon , Rosas-caro, Julio , Mayo Maldonado, Jonathan , Jesus E. Valdez-Resendiz

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A Dynamic Motion Tracking Control Approach for a Quadrotor Aerial Mechanical System

2020 , Hugo Yañez-Badillo , Francisco Beltran-Carbajal , Ruben Tapia-Olvera , Valderrabano-Gonzalez, Antonio , Antonio Favela-Contreras , Rosas-caro, Julio , Pierangelo Masarati

This paper deals with the reference trajectory tracking problem and simultaneous active disturbance suppression on a class of controlled aerial mechanical systems by processing measurable output signals. A novel dynamic control method for desired motion reference trajectory tracking for quadrotor helicopters is introduced. Measurements of position output signals for efficient and robust tracking of motion profiles specified for the unmanned aerial vehicle are only required. Thus, differentiation of signals and real-time estimation of disturbances affecting the multi-input multioutput, underactuated nonlinear dynamic system are unnecessary. The presented active control approach can be directly extended for a class of vibrating mechanical systems. Analytical, experimental, and numerical results are presented to prove the satisfactory performance of the proposed trajectory tracking control approach for considerably perturbed operating scenarios.

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Publication

A DC–DC converter with quadratic gain and input current ripple cancelation at a selectable duty cycle

2017 , Pedro Martín García–Vite , Carlos Abraham Soriano–Rangel , Rosas-caro, Julio , Fernando Mancilla–David

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Simulation and Comparative Analysis of DFIG-based WECS Using Stator Voltage and Stator Flux Reference Frames

2017 , Gabriel Calderon Zavala , Jesus Dario Mina Antonio , Rosas-caro, Julio , Manuel Madrigal Martinez , Abraham Claudio Sanchez , Adolfo Rafael Lopez Nunez

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