Papers by JAZMIN HERNANDEZ
2021 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC)
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The use of different sources to energize a load is convenient in many applications, particularly ... more The use of different sources to energize a load is convenient in many applications, particularly those where two or more renewable energy sources are employed as: energy harvesting, hybrid vehicles, and off-grid systems. In these cases, a multi-input converter able to admit sources with different characteristics and, if necessary, select the output power of each source. Several topologies of multi-input converters have been proposed to this aim, however, most of them are based on multi-stage designs, which decreases efficiency and increases control complexity, particularly when more than two sources are used. In this work, a three-input step-up converter easy to control in open loop condition is analyzed. A designed procedure is described, and experimental results are presented for a 1 kW power converter. The implemented converter results in a higher voltage gain, less storage element keeping high efficiency compared to similar topologies. Using the procedure here proposed, this con...
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This paper presents the principle of operation and the control algorithm in matrix converter topo... more This paper presents the principle of operation and the control algorithm in matrix converter topology used in an AC-DC converter for battery charger applications in electric vehicles. The operation of a matrix converter leg is described to achieve a Zero Voltage Transition (ZVT); idealized waveforms and steady-state analysis are explained together with simulation results in Saber.
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In this paper a voltage controller based on an Artificial Neural Network (ANN) is presented. Its ... more In this paper a voltage controller based on an Artificial Neural Network (ANN) is presented. Its online learning back-propagation algorithm allows the output voltage regulation according to a desired reference output voltage. To verify that the proposed controller operates according to the design, a numerical verification in Matlab software is presented for three basic DC-DC converters: buck, boost and buck-boost topologies.
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Mathematics, 2021
Digital image watermarking algorithms have been designed for intellectual property, copyright pro... more Digital image watermarking algorithms have been designed for intellectual property, copyright protection, medical data management, and other related fields; furthermore, in real-world applications such as official documents, banknotes, etc., they are used to deliver additional information about the documents’ authenticity. In this context, the imperceptible–visible watermarking (IVW) algorithm has been designed as a digital reproduction of the real-world watermarks. This paper presents a new improved IVW algorithm for copyright protection that can deliver additional information to the image content. The proposed algorithm is divided into two stages: in the embedding stage, a human visual system-based strategy is used to embed an owner logotype or a 2D quick response (QR) code as a watermark into a color image, maintaining a high watermark imperceptibility and low image-quality degradation. In the exhibition, a new histogram binarization function approach is introduced to exhibit any...
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Electronics, 2021
In a practical watermark scenario, watermarks are used to provide auxiliary information; in this ... more In a practical watermark scenario, watermarks are used to provide auxiliary information; in this way, an analogous digital approach called unseen–visible watermark has been introduced to deliver auxiliary information. In this algorithm, the embedding stage takes advantage of the visible and invisible watermarking to embed an owner logotype or barcodes as watermarks; in the exhibition stage, the equipped functions of the display devices are used to reveal the watermark to the naked eyes, eliminating any watermark exhibition algorithm. In this paper, a watermark complement strategy for unseen–visible watermarking is proposed to improve the embedding stage, reducing the histogram distortion and the visual degradation of the watermarked image. The presented algorithm exhibits the following contributions: first, the algorithm can be applied to any class of images with large smooth regions of low or high intensity; second, a watermark complement strategy is introduced to reduce the visual...
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Electronics, 2020
The use of Inductive Wireless Power Transfer (IWPT) varies from low-power applications such as mo... more The use of Inductive Wireless Power Transfer (IWPT) varies from low-power applications such as mobile phones and tablets chargers to high-power electric vehicles chargers. DC–DC converters are used in IWPT systems, and their design needs to consider the demand of high efficiency in the power transfer. In this paper, a DC–DC power converter for IWPT is proposed. Its topology uses a DC–AC converter in the transmitter circuit and an AC–DC converter in the receptor. The transmitter has an interleaved coupled-Buck converter that integrates two Buck converters connected to a half inverter bridge and a parallel resonant load. The control strategy implemented for the semiconductor switching devices allows two operating modes to obtain a sinusoidal output voltage with a low distortion that makes it suitable in high-efficiency power transfer systems. To obtain a DC output voltage, a full wave bridge rectifier is used in the receptor circuit. The proposed topology and the control strategy are ...
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BMJ, 2020
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Mathematics, 2020
A model and real-time simulation of a gas turbine engine (GTE) by real-time tasks (RTT) is presen... more A model and real-time simulation of a gas turbine engine (GTE) by real-time tasks (RTT) is presented. A Kalman filter is applied to perform the state vector identification of the GTE model. The obtained algorithms are recursive and multivariable; for this reason, ANSI C libraries have been developed for (a) use of matrices and vectors, (b) dynamic memory management, (c) simulation of state-space systems, (d) approximation of systems using equations in matrix finite difference, (e) computing the mean square errors vector, and (f) state vector identification of dynamic systems through digital Kalman filter. Simulations were performed in a Single Board Computer (SBC) Raspberry Pi 2® with a real-time operating system. Execution times have been measured to justify the real-time simulation. To validate the results, multiple time plots are analyzed to verify the quality and convergence time of the mean square error obtained.
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IEEE Latin America Transactions, 2020
The principle of operation of a modular AC-DC converter for Plug in Electric Vehicles (PEV’s) bat... more The principle of operation of a modular AC-DC converter for Plug in Electric Vehicles (PEV’s) battery charger applications is presented. The topology is a split version of a conventional active rectifier in a three-phase matrix converter and an H bridge. A Space Vector Pulse Width Modulation (SVPWM) scheme is used together with a Zero Voltage Switching (ZVS) strategy to reduce the switching loses, output voltage regulation, and a low Total Harmonic Distortion (THD). Simulation results are presented to verify the principle of operation of the AC-DC topology with a 5 kW converter.
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Energies, 2017
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Mathematical Problems in Engineering, 2016
The realization of an improved predictive current controller based on a trapezoidal model is desc... more The realization of an improved predictive current controller based on a trapezoidal model is described, and the impact of this technique is assessed on the performance of a 2 kW, 21.6 kHz, four-wire, Active Power Filter for utility equipment of Metro Railway, Power-Land Substations. The operation of the trapezoidal predictive current controller is contrasted with that of a typical predictive control technique, based on a single Euler approximation, which has demonstrated generation of high-quality line currents, each using a 400 V DC link to improve the power quality of an unbalanced nonlinear load of Metro Railway. The results show that the supply current waveforms become virtually sinusoidal waves, reducing the current ripple by 50% and improving its power factor from 0.8 to 0.989 when the active filter is operated with a 1.6 kW load. The principle of operation of the trapezoidal predictive controller is analysed together with a description of its practical development, showing ex...
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2015 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE), 2015
This paper presents a typical topology of medium-power, active power filter that utilizes a one-s... more This paper presents a typical topology of medium-power, active power filter that utilizes a one-step ahead current controller to improve the power quality of a four-wire, unbalanced nonlinear load without using an additional switching limb to regulate the neutral current. In contrast to commonplace control techniques of shunt active filters, the one-step ahead strategy, or predictive control method of the presented circuit, determines the switching of the active filter and, thereby, the generation of its currents, such that the supply current waveforms become virtually sinusoidal waves, being its THD -% when the filter is operated with a 2kW load. The principle of operation of the switching control scheme is analysed, using a space vector technique for simple implementation together with a description of its practical development, showing experimental results obtained with a 2kW prototype.
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2015 IEEE Vehicle Power and Propulsion Conference (VPPC), 2015
The present work describes the FPGA implementation of a PLL synchronization method and a Space Ve... more The present work describes the FPGA implementation of a PLL synchronization method and a Space Vector Modulation (SVM) for a Matrix Converter destined to be used in future electric vehicles. The use of this implementation technique has three advantages: first, a rotating frame transformation is used as a phase detector; the implementation of the PLL and SVM is realized in a low-cost FPGA; and third, the implementation allows both faster processing time and switching action of a Master Digital Signal Processor (DSP) for other tasks, such as internal and external control loops of the power converter and parallel operation of control blocks. Simulation and experimental results are shown along the paper to verify the correct operation of the FPGA implementation, showing that the system PLL response is accurate to its ideal design with minimal delay effects.
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2014 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC), 2014
This paper presents the experimental verification of a current control technique for an active re... more This paper presents the experimental verification of a current control technique for an active rectifier that uses a one-step ahead sample. The implementation uses a space-vector lineal model of the converter to predict the next current sample using an algorithm implemented on a DSP platform. The one step ahead calculations model and cost function evaluation is rapidly executed, such that control technique is operated at real time on a 3kW prototype. Steady state and dynamic experimental results are presented along the paper.
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2014 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC), 2014
In this work an improved Space Vector PWM (SVPWM) scheme is proposed for a three-phase thirteen-l... more In this work an improved Space Vector PWM (SVPWM) scheme is proposed for a three-phase thirteen-level inverter. The proposed topology has a reduced number of space vector and redundant switching states, and the space vector PWM scheme presented solve the problem of computational complexity in the control of semiconductor devices. Based on this control strategy, the location of the reference voltage vector can be easily determined and the calculation of active times becomes very simple. In addition, a three-phase thirteen-level inverter using space vector modulation has been modeled and simulated. Simulation results are presented for different operation conditions using MATLAB/Simulink.
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2013 15th European Conference on Power Electronics and Applications (EPE), 2013
ABSTRACT Multilevel Inverters are increasingly being used in high-power and medium voltage applic... more ABSTRACT Multilevel Inverters are increasingly being used in high-power and medium voltage applications; there are many modulation techniques available to control their operation. In this paper, the Space Vector PWM Technique (SVPWM) to control a hybrid multilevel inverter is described. The inverter produces thirteen-level, SVPWM, three-phase waveforms using a bidirectional switch, twelve transistors and a delta-star transformer. The simulation and experimental results obtained with a 1 kW prototype are provided to verify the correct operation of the converter.
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2013 IEEE International Symposium on Sensorless Control for Electrical Drives and Predictive Control of Electrical Drives and Power Electronics (SLED/PRECEDE), 2013
ABSTRACT This paper presents a predictive control variant of a Multi-level Inverter that uses Spa... more ABSTRACT This paper presents a predictive control variant of a Multi-level Inverter that uses Space Vector Modulation with a single carrier. A linear model of the inverter is derived to predict the behavior of the EMF converter voltage and implement a current control law which uses the space vector modulation principle of the inverter. The fundamental of operation of this control strategy is described together with Saber numerical simulation results that validate the method with a 1kW prototype.
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2013 IEEE Energy Conversion Congress and Exposition, 2013
ABSTRACT Recent advances in power have made multilevel converters suitable for high-power and med... more ABSTRACT Recent advances in power have made multilevel converters suitable for high-power and medium voltage applications; there are many modulation techniques available to control their operation. In this paper, the Space Vector Pulse Width Modulation (SVPWM) technique to control a multilevel inverter is described. The inverter produces seven-level SVPWM three-phase voltage waveforms using twelve transistors and a delta-star transformer. The control strategy is implemented on a DSPIC and requires only the modulation index as an input to obtain the voltage amplitude required in the three-phase output. A description of the SVPWM algorithm, the improvement of the control signals to reduce the switching losses in the power semiconductor devices and the implementation are presented along with a discussion of simulation and experimental results obtained with a 1 kW prototype.
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A three-phase AC-DC converter is proposed to charge the battery or DC-link of Wireless Electric V... more A three-phase AC-DC converter is proposed to charge the battery or DC-link of Wireless Electric Vehicles (WEVs). The topology uses a current-feed, single-output matrix converter and a high frequency (HF) transformer together with an H bridge to obtain regulated DC output voltage, such that the galvanic isolation of the transformer may be used as the wireless link. The converter uses a variant of a predictive current control strategy by calculating a one-step ahead current sample, such that the input currents become virtually sinusoidal with unity power factor, offering the possibility of handling bidirectional power flow. The paper describes the principle of operation of the converter together with a numerical verification of the system under dynamic conditions.
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Papers by JAZMIN HERNANDEZ