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

Research Output
Now showing 1 - 10 of 118
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Sliding Mode Speed Control in Synchronous Motors for Agriculture Machinery: A Chattering Suppression Approach

2024 , Marcos Andrade, David , Beltran Carbajal, Francisco , Rivas Cambero, Ivan , Yañez Badillo, Hugo , Favela Contreras, Antonio , 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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Numerical Optimization of the Capacitors Selection in the MSBA Converter to Reduce the Output Voltage Ripple

2022 , Alejo-Reyes, Avelina , Rodríguez Vázquez, Alma Nayeli , Rosas-caro, Julio , Mendoza, Abraham

DC–DC power electronics converters are widely used in many applications, such as renewable energy systems. The multistage-stacked boost architecture (MSBA) converter is a large voltage gain converter whose PWM scheme may reduce a percentage of the output voltage ripple, taking advantage of the symmetry of the voltage signals in capacitors (they are triangular waveforms) to have a symmetry cancelation. The switching ripple is unavoidable; the correct selection of components can reduce it, but this may result in a large amount of stored energy (larger size). The selection of capacitors influences the output voltage ripple magnitude. This article proposes a design methodology that combines a recently introduced PWM scheme with a numerical optimization method to choose the capacitors for the MSBA converter. The objective is to minimize the output voltage ripple by choosing two capacitors simultaneously while ensuring the constraint of a certain (maximum) amount of stored energy in capacitors is not overpassed. The internal optimization was performed with the differential evolution algorithm. The results demonstrate that the proposed method that includes numerical optimization allows having a very low output voltage ripple with the same stored energy in capacitors compared to the traditional converter. In a design exercise, up to 60% reduction was observed in the output voltage ripple with the same stored energy in capacitors.

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Data-Driven Based Control Applied to DC Network Converters for Voltage Bus Stabilization

2020 , J. Loranca-Coutino , C.V. Villarreal-Hernandez , Ruiz-Martinez, O.F. , Mayo Maldonado, Jonathan , J.E. Valdez-Resendiz , G. Escobar , Rosas-caro, Julio , Daniel Guillen

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Improvement of ultracapacitors-energy usage in fuel cell based hybrid electric vehicle

2020 , Jesus E. Valdez-Resendiz , Rosas-caro, Julio , Mayo Maldonado, Jonathan , Abraham Claudio-Sanchez , Omar Ruiz-Martinez , Victor M. Sanchez

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Storage and Dissipation Limits in Resonant Switched-Capacitor Converters

2018 , Mayo Maldonado, Jonathan , T. M. Maupong , Jesús E. Valdez-Reséndiz , Rosas-caro, Julio

The purpose of this manuscript is twofold, first we introduce an energy-based modeling framework for the analysis of resonant switched-capacitor (SC) converters and second we demonstrate that energy storage and dissipation in resonant SC with ideal switches are bounded by a fundamental physical limit that, up until now, has been only associated with the special case of pure SC topologies. For instance, we show that the maximum energy stored in the small size inductors in resonant SC converters is equal to the energy that would be dissipated by their purely SC counterpart. The presented analysis permits the computation of resonant inductances in terms of maximum current peak values, which is experimentally validated. Furthermore, we introduce a relative loss factor that permits determining the efficiency of a design for a general case in the presence of parasitic resistances. These results corroborate that migrating to resonant SC technologies is one of the most compelling alternatives to overcome well-known disadvantages in pure SC topologies.

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High Gain Boost Converter with Reduced Voltage in Capacitors for Fuel-Cells Energy Generation Systems

2020 , Javier Loranca-Coutiño , Carlos A. Villarreal-Hernandez , Mayo Maldonado, Jonathan , Jesús E. Valdez-Resendiz , Adolfo R. Lopez-Nuñez , Ruiz-Martinez, O.F. , Rosas-caro, Julio

This work presents a power-electronics based system for renewable energy applications, the system is driven with an only one switch quadratic type boost converter, the discussed converter is based on a stack of switching stages which provide a large voltage gain, a desirable feature for fuel cell generation systems, the converters gain function is the quadratic boost-type converters; furthermore, the topology can be extended. The major benefit of the topology is that there is not a capacitor that sustains the entire output voltage, in contrast to other similar topologies in which there is a capacitor rated to the output port voltage, there is no high voltage capacitor in this system. Experimental verification is presented to confirm the system principles; experiments included a fuel cell emulator that was built and used for the experiments.

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Quadratic gain converter with output voltage ripple mitigation

2017 , Pedro Martin Garcia-Vite , Jesus Elias Valdez-Resendiz , Mayo Maldonado, Jonathan , Rosas-caro, Julio , Maria del Rosario Rivera-Espinosa , Valderrabano-Gonzalez, Antonio

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Closed-loop online harmonic vibration estimation in DC electric motor systems

2021 , F. Beltran-Carbajal , R. Tapia-Olvera , Valderrabano-Gonzalez, Antonio , H. Yanez-Badillo , Rosas-caro, Julio , Mayo Maldonado, Jonathan

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Power Balancing Approach for Modeling and Stabilization of DC Networks

2019 , Mayo Maldonado, Jonathan , Jesus E. Valdez-Resendiz , Rosas-caro, Julio

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Numerical Optimization of Switching Ripples in the Double Dual Boost Converter through the Evolutionary Algorithm L-SHADE

2020 , Rodríguez Vázquez, Alma Nayeli , Alejo-Reyes, Avelina , Erik Cuevas , Robles-Campos, Héctor R. , Rosas-caro, Julio

Power-electronics based converters are essential circuits in renewable energy applications such as electricity generated with photovoltaic panels. The research on the field is getting increasing attention due to climate change problems and their possible attenuation with the use of renewable energy. Mathematical models of the converters are being used to optimize several aspects of their operation. This article is dedicated to optimizing (through the mathematical model and an evolutionary algorithm) the operation of a state-of-the-art converter. The converter, which is composed of two parts or phases, is controlled by pulse width modulation with two switching signals (one for each phase). The converter provides by itself low switching ripple in both the output voltage and the input current, which is beneficial for renewable energy applications. In the traditional operation, one of the switching signals has an algebraic dependence on the other one. This article proposes a new way to select the duty cycle for both signals. In the proposed method, duty cycles of both phases are considered independent of each other; this provides an extra degree of freedom; on the other hand, this produce that the possible combinations of duty cycles which produce a certain voltage gain is infinite, it becomes a problem with infinite possible solutions. The proposed method utilizes the a linear success-history based adaptive differential evolution with linear population reduction, also called L-SHADE algorithm for simplicity, to find the two duty cycles that achieve the desired voltage gain and to minimize the converters switching ripple. The obtained results are compared with the former operation of the converter; the proposed operation achieves a lower output voltage ripple while achieving the desired operation (voltage gain).

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