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32nd IEEE International Symposium on industrial Electronics, ISIE 2023

作者： Rahimi, Leila Dòria-Cerezo, Arnau Griñó, Robert Inst. of Ind. and Control Engineering Universitat Politècnica de Catalunya Barcelona Spain Universitat Politècnica de Catalunya Inst. of Industrial and Control Eng. Dept. of Electrical Engineering Barcelona Spain Universitat Politècnica de Catalunya Inst. of Industrial and Control Eng. Dept. of Automatic Control Barcelona Spain

ISBN: (纸本)9798350399714

This paper analyzes the zero dynamics of three-phase current source inverters fed from a voltage source and connected to a local resistive load or the electrical power grid. The zero dynamics is the remaining dynamics of a system when it exactly meets the control objectives. It is important for understanding the system behaviour, and its limitations, and designing efficacious controllers. The analysis concludes that, when the power source is modelled from its Thévenin equivalent circuit, some stability problems occur in the dc link if the control scheme only tracks the output voltage. The paper includes an alternative nested-loop controller that overcomes the internal dc-current inst.bility. © 2023 IEEE.

关键词： Equivalent circuits

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PI Passivity-based control of a Stand-alone Three-phase Current Source Inverter ⁎

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IFAC-PapersOnLine 2024年第13期58卷 362-367页

作者： Pau Boira-Pujol Romeo Ortega Arnau Dória-Cerezo Robert Griñó Institute of Industrial and Control Engineering Universitat Politècnica de Catalunya 08028 Barcelona Spain Departament of Electrical Engineering ITAM Ciudad de México Mexico Dept. of Electrical Engineering and Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya 08028 Barcelona Spain Dept. of Automatic Control and Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya 08028 Barcelona Spain

This paper presents the design of a Proportional-Integral Passivity-based controller (PI-PBC) for a current source inverter feeding a resistive load. Thanks to the definition of a new passive output, the closed-loop system is shown to be globally asymptotically stable. This result solves the internal stability problem reported for these power converters. To robustify the control algorithm, the paper also includes the design of a parameter estimation scheme for the parasitic resistances and the load conductance. Numerical simulations are carried out to validate the control algorithm. The simulation stage compares the behaviour using the averaged model of the power converter and a more realistic switching model, including the three-phase implementation.

关键词： Current source inverter Passivity-based control Proportional-Integral controllers parameter estimation

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High Efficiency and High Gain Hybrid DC-DC Converter with Switched Capacitor 8

High Efficiency and High Gain Hybrid DC-DC Converter with Sw...

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8th Southern Power Electronics Conference and the 17th Brazilian Power Electronics Conference, SPEC / COBEP 2023

作者： Rodrigues, Brenna Theodora MacHado Matos Moura, Mauricio Albuquerque Sá, Edilson Mineiro De Sousa, Kleber Cesar Alves Dept. Electrical and Computer Engineering Sobral Brazil Federal Institute of Caera Dept. Control and Industrial Processes Sobral Brazil

ISBN: (纸本)9798350321128

This work presents the study and development of a high-gain hybrid DC-DC converter with switched capacitor for photovoltaic energy applications. Qualitative analyzes and quantitative values of the converter are proposed. The proposed converter is based on the converter boost integrated into switched capacitive cells with the addition of a small inductor resonant. A mathematical modeling of the converter was developed to determine the value of the resonant inductance, where the converter was analyzed for inductance values of 1uH at 2uH. This proposal presented some advantages: such as extended static gain, reduction of voltage stress in semiconductors and reduction of current peaks in switches. A 200 W prototype was developed and its respective results are presented. Maximum efficiency obtained was 97.1% for a voltage gain of 10. © 2023 IEEE.

关键词： boost converter efficiency high gain converter hybrid DC-DC converter switched capacitor

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Complex-valued sliding mode control for a stand-alone three-phase CSI modelled with an ideal current source

Complex-valued sliding mode control for a stand-alone three-...

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Mediterranean Electrotechnical Conference (MELECON)

作者： Leila Rahimi Arnau Dòria-Cerezo Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Barcelona Spain Dept. of Electrical Engineering Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Barcelona Spain

ISBN: (数字)9798350387025

ISBN: (纸本)9798350387032

This paper presents the design of a complex-valued sliding mode controller for a three-phase current source inverter feeding a resistive load, assuming that an ideal current source models the DC side. Numerical simulations are carried out to validate the control algorithm. The simulation stage compares the ideal sliding mode behaviour and the performance when a discrete time and the three-phase implementation are considered. Finally, the numerical validation includes the performance in front of nonlinear resistors.

关键词： Resistors Manifolds Switches Numerical simulation Vectors Robustness Numerical models

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A Single-Carrier Modulation Strategy for the Reduction of the DC-Link Voltage Ripple of a 5-Level Multilevel DC-Link Inverter 50

A Single-Carrier Modulation Strategy for the Reduction of th...

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50th Annual Conference of the IEEE industrial Electronics Society, IECON 2024

作者： Kahwa, Almachius Ebot, Besong John Fujimoto, Yasutaka Mwasilu, Francis Ojo, Joseph Olorunfemi Dept. of Electrical Engineering University of Dar es Salaam Dar es Salaam Tanzania United Republic of Inst. of Multidisciplinary Science Yokohama National University Yokohama Japan Dept. of Physics Electrical and Computer Engineering Yokohama National University Yokohama Japan Dept. of Electrical and Computer Engineering Tennessee Technological University TN United States

ISBN: (纸本)9781665464543

This paper presents a simple single-carrier PWM (SC-PWM) method based on the multi-modulation technique and using the redundant switching states of the 5-level hybrid multilevel dc-link inverter to balance the dc-link voltage. The proposed SC-PWM reduces the dc-link capacitor-voltage ripple, thereby reducing the voltage stress on the switches and improving the reliability of the inverter by eliminating all the low-fundamental frequency voltage oscillations in the capacitor voltage in the full range of power factors. Additionally, the proposed modulation strategy achieves a 2-fold reduction in the size of the output filter while reducing the total harmonic distortion of the output voltage and current. The feasibility of the proposed scheme over other modulation techniques is confirmed in a comparative analysis. Finally, the steady-state performances of the SC-PWM strategy are demonstrated in simulations and experiments. © 2024 IEEE.

关键词： Capacitor bank

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Nonlinear optimal control for the 4-DOF underactuated robotic tower crane

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Autonomous Intelligent Systems 2022年第1期2卷 1-30页

作者： Rigatos, G. Abbaszadeh, M. Pomares, J. Unit Industrial Automation Industrial Systems Institute Patras26504 Greece Dept. ECS Engineering Rensselaer Polytechnic Inst. NY12065 United States Dept. of Systems Engineering University of Alicante Alicante03690 Spain

Tower cranes find wide use in construction works, in ports and in several loading and unloading procedures met in industry. A nonlinear optimal control approach is proposed for the dynamic model of the 4-DOF underactuated tower crane. The dynamic model of the robotic crane undergoes approximate linearization around a temporary operating point that is recomputed at each time-step of the control method. The linearization relies on Taylor series expansion and on the associated Jacobian matrices. For the linearized state-space model of the system a stabilizing optimal (H-infinity) feedback controller is designed. To compute the controller’s feedback gains an algebraic Riccati equation is repetitively solved at each iteration of the control algorithm. The stability properties of the control method are proven through Lyapunov analysis. The proposed control approach is advantageous because: (i) unlike the popular computed torque method for robotic manipulators, the new control approach is characterized by optimality and is also applicable when the number of control inputs is not equal to the robot’s number of DOFs, (ii) it achieves fast and accurate tracking of reference setpoints under minimal energy consumption by the robot’s actuators, (iii) unlike the popular Nonlinear Model Predictive control method, the article’s nonlinear optimal control scheme is of proven global stability and convergence to the optimum. © 2022, The Author(s).

关键词： Jacobian matrices

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Improved Row-Column-Addressed Array Imaging by Leveraging Ghost Echoes

Improved Row-Column-Addressed Array Imaging by Leveraging Gh...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Mei, Chung-Shiang Li, Meng-Lin National Tsing Hua University Dept. of Electrical Engineering Hsinchu Taiwan National Tsing Hua University Inst. of Photonic Technologies Brain Research Center Dept. of Electrical Engineering Hsinchu Taiwan

ISBN: (纸本)9798350346459

Among various choices of 2-D ultrasound transducer arrays, the row-column-addressed (RCA) 2-D array has shown its promise for 3-D imaging. However, RCA suffers from notable edge effects and thus receives ghost echoes, which result in ghost artifacts showing in the volumetric image. In this research, rather than discarding these ghost echoes, we consider them as supportive signals and incorporate them into a post-filtering-based method to enhance the RCA imaging quality. Field II simulation and results of a single scatterer are presented in this work. The strongest ghost artifact is suppressed by 23 dB and the -6 dB lateral resolution is improved from 1.06 to 0.81 mm. The proposed method shows promising results in suppressing ghost artifacts and enhancing lateral resolution. © 2023 IEEE.

关键词： Ultrasonic transducers

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Copy-Paste Image Augmentation with Poisson Image Editing for Ultrasound inst.nce Segmentation Learning

Copy-Paste Image Augmentation with Poisson Image Editing for...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Shen, Wei-Hsiang Li, Meng-Lin National Tsing Hua University Dept. of Electrical Engineering Hsinchu Taiwan National Tsing Hua University Inst. of Photonic Technologies Brain Research Center Dept. of Electrical Engineering Hsinchu Taiwan

ISBN: (纸本)9798350346459

Deep learning has shown great success in high-level image analysis problems;yet its efficacy relies on the quality and diversity of the training data. In this work, we introduce a copy-paste image augmentation for ultrasound images. The Poisson image editing technique is used to generate realistic and seamless boundary transitions around the pasted image. Results showed that the proposed image augmentation technique improves training performance in terms of higher objective metrics and more stable training results. © 2023 IEEE.

关键词： Image enhancement

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Improving Axial Resolution of Optical Resolution Photoacoustic Microscopy with Advanced Frequency Domain Eigenspace Based Minimum Variance Beamforming Method

Improving Axial Resolution of Optical Resolution Photoacoust...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Yu, Yu-Hsiang Li, Meng-Lin National Tsing Hua University Dept. of Electrical Engineering and Brain Research Center Hsinchu Taiwan Inst. of Photonic Technologies Brain Research Center National Tsing Hua University Dept. of Electrical Engineering Hsinchu Taiwan

ISBN: (纸本)9798350346459

Optical resolution photoacoustic microscopy (OR-PAM) leverages optical focusing and acoustic detection for microscopic optical absorption imaging. Intrinsically it owns high optical lateral resolution and poor acoustic axial resolution. Such anisometric resolution hinders good 3-D visualization;thus 2-D maximum amplitude projection images are commonly presented in the literature. Since its axial resolution is limited by the bandwidth of acoustic detectors, ultrahigh frequency, and wideband detectors with Wiener deconvolution have been proposed to address this issue. Nonetheless, they also introduce other issues such as severe high-frequency attenuation and limited imaging dept.. In this work, we view axial resolution improvement as an axial signal reconstruction problem, and the axial resolution degradation is caused by axial sidelobe interference. We propose an advanced frequency-domain eigenspace-based minimum variance (F-EIBMV) beamforming technique to suppress axial sidelobe interference and noises. This method can simultaneously enhance the axial resolution and contrast of OR-PAM. For a 25-MHz OR-PAM system, the full-width at half-maximum of an axial point spread function decreased significantly from 69.3 μm to 16.89 μm, indicating a significant improvement in axial resolution. © 2023 IEEE.

关键词： Frequency domain analysis

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New control Method for Multi-phase Buck DC-DC Converters Used with Photovoltaic Panels 5

New Control Method for Multi-phase Buck DC-DC Converters Use...

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5th IEEE International Conference on Modern electrical and Energy System, MEES 2023

作者： Kovac, Dobroslav Melnykov, Viacheslav Technical University of Kosice Faculty of Electrical Engineering and Informatics Dept. of Theoretical and Industrial Electrical Engineering Kosice Slovakia Institute of Electromechanics Energy Saving and Control Systems Kremenchuk Mykhailo Ostrohradskyi National University Kremenchuk Ukraine

ISBN: (纸本)9798350359787

The paper deals with a new algorithm for controlling a multi-phase buck DC-DC converter. The principle of its control is explained in detail using a flowchart. It is based on the continuous change of the converter topology using the number of its currently controlled phases depending on the size of the input power. In connection with this, its microprocessor control is also mentioned. The whole issue is explained on the design, simulation and measurement of a laboratory sample of a four-phase buck converter. © 2023 IEEE.

关键词： Solar panels

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