Robles-Campos, Héctor R.
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Preferred name
Robles-Campos, Héctor R.
Official Name
Robles Campos, Héctor
Alternative Name
hrobles
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ORCID
Scopus Author ID
57192552877
Researcher ID
GPW-8416-2022

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Optimal Operation of the Voltage-Doubler Boost Converter through an Evolutionary Algorithm

2021 , Cesar Ibarra-Nuño , Rodríguez Vázquez, Alma Nayeli , Alejo-Reyes, Avelina , Erik Cuevas , Juan M. Ramirez , Rosas-caro, Julio , Robles-Campos, Héctor R.

This manuscript presents the numerical optimization (through a mathematical model and an evolutionary algorithm) of the voltage-doubler boost converter, also called the series-capacitor boost converter. The circuit is driven by two transistors, each of them activated according to a switching signal. In the former operation, switching signals have an algebraic dependence from each other. This article proposes a new method to operate the converter. The proposed process reduces the input current ripple without changing any converter model parameter, only the driving signals. In the proposed operation, switching signals of transistors are independent of each other, providing an extra degree of freedom, but on the other hand, this produces an infinite number of possible combinations of duty cycles (the main parameter of switching signals) to achieve the desired voltage gain. In other words, this leads to a problem with infinite possible solutions. The proposed method utilizes an evolutionary algorithm to determine the switching functions and, at the same time, to minimize the input current ripple of the converter. A comparison made between the former and the proposed operation shows that the proposed process achieves a lower input current ripple while achieving the desired voltage gain.

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Single-Phase Five-Level Multilevel Inverter Based on a Transistors Six-Pack Module

2022 , Flavio A. Garcia-Santiago , Rosas-caro, Julio , Jesus E. Valdez-Resendiz , Mayo Maldonado, Jonathan , Robles-Campos, Héctor R. , Valderrabano-Gonzalez, Antonio

This article introduces a single-phase five-level multilevel inverter based on six switches and two transformers. The proposed converter requires a single dc input source with low voltage. The disposition of switches makes it possible to build the converter with a transistors six-pack module off-the-shelves, traditionally used to build three-phase inverters, which simplifies the manufacturing process. The converter increases the voltage with two transformers; for that reason, it does not require an auxiliary step-up converter. The use of transformers (with the transformer’s turns ratio) allows for using the same topology for several input voltage levels. To verify the operation of the proposed multilevel inverter, a computer-based simulation was performed with PSIM, a software that considers parasitic components. The results show that the proposed converter can work properly.

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Improved interleaved Ćuk power converter

2023 , Robles-Campos, Héctor R. , Rosas-caro, Julio , Valderrabano-Gonzalez, Antonio , Posada, Johnny

An improved interleaved Ćuk power converter called in short –"Interleaved Two"– is designed and presented in this article. It is investigated and compared to a similar interleaved Ćuk power converter named as –"Interleaved One"– . The result is that the "Interleave Two" topology requires less reactive elements than the "Interleaved One" to achieve same performance, it will offer the possibility to reduce its size and economic cost. The operational principle and modeling is presented thoroughly. Moreover, simulation results comparing steady state time, output voltage, input current ripple and efficiency are presented. Additionally, in order to validate the performance of the "Interleaved Two" converter experimental results are included.

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A high step-up DC-DC converter with MPPT for PV application

2017 , Maria del Rosario Rivera-Espinosa , Alfredo Y. Alejandre-Lopez , Jesus E. Pedraza-Barron , Pedro Martin Garcia-Vite , Robles-Campos, Héctor R.

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Detailed modeling of large scale photovoltaic power plants under partial shading conditions

2019 , Robles-Campos, Héctor R. , Bernardo J. Azuaje–Berbecí , Christopher J. Scheller , Alejandro Angulo , Fernando Mancilla–David

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Double Dual High Step-Up Power Converter with Reduced Stored Energy

2023 , Robles-Campos, Héctor R. , Valderrabano-Gonzalez, Antonio , Rosas-caro, Julio , Hossam A. Gabbar , Bhanu Babaiahgari

This paper introduces a dual-switchhigh step-up DC-DC power converter. The proposed converter features a high step-up voltage gain, relatively low cumulative stored energy over its inductors, low voltage stress on the active switches, and high efficiency, even at a relatively high duty ratio. An assessment of the proposed converter against conventional boost and a high step-up power converter is presented in terms of steady-state time, voltage gain, stored energy over its inductors, and efficiency. The assessment shows a reduction of 81.25% and 62.5% of stored energy in inductors to comply with the same operational conditions. Simulation and experimental results are provided to validate the benefits of the proposed dual-switch high step-up power converter.

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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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Detailed Assessment of Modulation Strategies for Hexverter–Based Modular Multilevel Converters

2022 , Robles-Campos, Héctor R. , Fernando Mancilla-David

Modular multilevel converters are playing a key role in the present and future development of topologies for medium–to–high–power applications. Among this category of power converters, there is a direct AC–AC modular multilevel converter called “Hexverter”, which is well suited to connect three–phase AC systems operating at different frequencies. This topology is the subject of study in this manuscript. The complete Hexverter system is composed of an Hexverter power converter and several control layers, namely, a “virtual VC2 controller”, a branch current controller in a two–frequency dq reference frame, a modulator, and a voltage balancing algorithm. The paper presents a thorough description and analysis of the entire Hexverter system, providing research contributions in three key aspects: (i) modeling and control in a unified two–frequency dq framework; (ii) developing a “virtual VC2 controller” to dynamically account for Hexverter’s active power losses allowing to achieve active power balance on the fly; and (iii) a comparative evaluation of modulation strategies (nearest level control and phase disposition–sinusoidal pulse width modulation). To this end, a detailed switched simulation was implemented in the PSCAD/EMTDC software platform. The proposed “virtual VC2 controller” is evaluated through the measurement of its settling time and calculation of active power losses. Each modulation technique is assessed through total harmonic distortion and frequency spectrum of the synthesized three–phase voltages and currents. The results obtained suggest that the control scheme is able to properly regulate the Hexverter system under both modulation strategies. Furthermore, the “virtual VC2 controller” is able to accurately determine the active power loss, which allows the assessment of the efficiency of the modulation strategies. The nearest level control technique yielded superior efficiency.

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A control scheme in the dq reference frame for Hexverter-based systems

2019 , Robles-Campos, Héctor R. , Fernando Mancilla-David

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Selective harmonic elimination for the modular multilevel converter

2016 , Robles-Campos, Héctor R. , Fernando Mancilla-David

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