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8th Workshop on Communication Networks and Power Systems, WCNPS 2023

作者： Mendes, Erico E. B. Assis, Ana Clara S. Pinto, Marcello H. M. De Conti, Alberto Ufmg - Universidade Federal de Minas Gerais PPGEE/UFMG - Graduate Program in Electrical Engineering Lrc - Lightning Research Center Brazil

ISBN: (纸本)9798350343571

A wideband black-box model is proposed to represent the transient response of an inductive voltage transformer used in 15-kV class distribution systems in Brazil. The proposed model is used to evaluate the surge transfer characteristics of the voltage transformer considering different loads for the application of a step-like impulse voltage at primary side. The model is built as a Norton-type equivalent circuit that is valid from 10 Hz to 10 MHz. It is demonstrated that the model is able to accurately reproduce the transient waveforms measured at the transformer secondary side for the application of impulse voltages at the primary side in all tested cases. © 2023 IEEE.

关键词： Equivalent circuits

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Time-Domain Analysis of Protection Systems - Assessing the Behavior of Overcurrent Function of Harmonic Filters During Energizations 8

Time-Domain Analysis of Protection Systems - Assessing the B...

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8th Workshop on Communication Networks and Power Systems, WCNPS 2023

作者： Soares De Souza, Joao R. Monteiro, Felipe Vidotti Resende, Filipe B. De Conti, Alberto Ufmg - Universidade Federal de Minas Gerais Brazil Vale S. A. Brazil Ppgee - Graduate Program in Electrical Engineering - Ufmg Brazil

ISBN: (纸本)9798350343571

This paper evaluates the behavior of harmonic filters subjected to overcurrents during energization. Statistical studies were carried out in ATPDraw considering different techniques to estimate the magnitude of inrush currents, one based on a true RMS estimator and another based on a 60-Hz Fourier filter phasor estimator. The results show that the theoretical limits of the currents used as reference to the overcurrent protection settings presented in literature were consistently defined in the evaluated cases, but that the selection of the decay time could be improved. © 2023 IEEE.

关键词： Time domain analysis

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Independent Field Excitation Control of an In-Wheel Wound-Field Flux-Switching Machine for Micro-Hybrid Applications 8

Independent Field Excitation Control of an In-Wheel Wound-Fi...

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

作者： Vilela Galo, Diogo Pereira Carvalho Maia, Thales Alexandre De Jesus Cardoso Filho, Braz Ufmg Graduate Program in Electrical Engineering Belo Horizonte Brazil Ufmg Department of Electrical Engineering Belo Horizonte Brazil

ISBN: (纸本)9798350321128

The tightening global emission regulations are com-pelling original equipment manufacturers and researchers to prioritize electrified solutions. In developing countries, fossfl fuel-powered vehicles are expected to continue being the primary choice for light-duty passenger vehicles in the medium term. It is crucial to recognize that micro and mild hybrid electric vehicles can make a significant contribution to reducing emissions and mitigating environmental impact. Electric machine designs with fewer or no rare-earth permanent magnets will play an important role in the widespread adoption of hybrid solutions. In this context, doubly salient reluctance machines exhibit a simple structure, robust mechanical strength, excellent fault tolerance, and a wide speed regulation range, making them well-suited for in-wheel applications. Particular emphasis should be placed on flux-switching ma-chines, which offer great operating flexibility, efficient heat dissipation, and power density of up to 4.8 kW/kg. This paper introduces a wound-field flux-switching machine designed for in-wheel applications, featuring individual field current control. Firstly, the machine is reconfigured to enable independent control of field currents, with a dedicated test bench equipped for precise current control. The primary objective of this research is to enhance the machine's operational versatility by facilitating electronic adjustment of the number of poles, promoting balanced operation' and auamentina field-weakenina capabilities. © 2023 IEEE.

关键词： Hybrid Electric Vehicles In-wheel drives Independent Field-Current Control Wound-Field Flux-Switching Machine

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The sensitivity analysis using adjoint method in numerical modeling of electric potential distribution of the transmission lines

The sensitivity analysis using adjoint method in numerical m...

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作者： Paganotti, André Luiz Saldanha, Rodney Resende Lisboa, Adriano Chaves Afonso, Márcio Matias Duane, Bell Abrão Marques Electrical Engineering Postgraduate Program UFSJ-CEFET-MG Minas Gerais Brazil Graduate Program in Electrical Engineering UFMG Minas Gerais Brazil

This paper proposes a new methodology for sensitivity analysis evaluation, fast and with high precision of the electric potential distribution near the transmission lines (TL's). The TL is modeled by the finite element method and the sensitivity of the cable positions is obtained using the adjoint method. The sensitivity of the objective function during the optimization process by using methods based on gradient information is obtained by using the adjoint method. The exact sensitivity obtained by the adjoint method concerning the numeric model of the TL's results in new geometries of the bundles conductors with high surge impedance loading. These geometries are not possible to get using analytic models. The sensitivities of a large number of conductors by phase are obtained with high precision and very low computational cost using adjoint sensitivities, which are independent of the number of design variables. The central finite difference method is used to calculate the sensitivities and to validate the adjoint method. With this methodology, the FEM model of the TL can be used during the optimization process without compromising the required computational processing time. © 2024 John Wiley & Sons Ltd.

关键词： Electric lines

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Low-Cost FPGA-Based Digital-to-Time Converter

Low-Cost FPGA-Based Digital-to-Time Converter

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IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Vilmondes Ribeiro Silva Dalton Martini Colombo Tomás Perpetuo Corrêa Graduate Program in Electrical Engineering (PPGEE) Federal University of Minas Gerais (UFMG) Brazil

ISBN: (数字)9798331522124

ISBN: (纸本)9798331522131

In this paper, we present a Digital-to-Time Converter (DTC) based on a low-cost FPGA platform, utilizing the Vernier with oscillators architecture. A DTC is a circuit that converts digital information into a very accurate time output. The proposed Vernier DTC is implemented on an Altera Cyclone III FPGA chip and features tunable resolution through the periodic relationships between two PLL-generated signals. The linearity of the system was measured for a resolution of 990 ps, showing DNL and INL values of −0.41 to +0.54 and −0.82 to +0.17, respectively. It has a range of 99 ns and an estimated power consumption of 89 mW. Furthermore, measurements demonstrate that the system achieves a maximum resolution of 12.5 ps, utilizing only 2% of the FPGA resources.

关键词： Semiconductor device measurement Power demand Linearity Timing Resource management IP networks Phase locked loops Signal resolution Field programmable gate arrays Oscillators

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Control Performance Assessment of a Zero Harmonic Distortion Grid-Forming Converter in Islanded Microgrids 8

Control Performance Assessment of a Zero Harmonic Distortion...

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

作者： Ramos, Gabriel Vilkn Parreiras, Thiago Morais De Jesus Cardoso Filho, Braz Ufmg Graduate Program in Electrical Engineering Belo Horizonte Brazil CEFET-MG Department of Electrical Engineering Belo Horizonte Brazil Ufmg Department of Electrical Engineering Belo Horizonte Brazil

ISBN: (纸本)9798350321128

The world is currently witnessing a rapid transformation in the production and utilization of electrical energy. The traditional centralized generation model for electric power is swiftly evolving into a more decentralized system, known as Distributed Generation (DG), which incorporates renewable energy sources situated closer to end-users. This shift towards DG has paved the way for the emergence of grid-forming converters, which play a pivotal role in enhancing voltage and frequency stability within microgrids (MGs) and isolated applications. This transformation is primarily driven by the increasing prevalence of inverter-based energy resources. In isolated MGs, ensuring high power quality becomes a paramount concern due to the presence of potentially disruptive loads and the risk of resonance issues arising from the integration of multiple electronically interfaced distributed energy resources (DERs) and loads. This study focuses on assessing the performance of the Zero Harmonic Distortion (ZHD) control method when applied to grid-forming converters in both stand-alone and parallel operation modes. The distinctive feature of this converter lies in its inherent ability to generate a sinusoidal voltage source without the need for capacitive filtering components, which can adversely affect cost, efficiency, and size while potentially contributing to resonance problems. This is achieved through a judicious combination of harmonic cancellation within a three-winding transformer and the utilization of Selective Harmonic Elimination Pulse Width Modulation (SHE PWM) dismissing a closed-loop control structure. Simulation results presented in this work demonstrate the satisfactory performance of the ZHD grid-forming converter. © 2023 IEEE.

关键词： ac microgrids Distributed generation grid forming converters power converters power systems selective harmonic elimination

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A modeling approach of EFT faults on in-vehicle communication protocols supported by FTA analysis

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IFAC-PapersOnLine 2024年第4期58卷 580-585页

作者： Daniel H. Pohren Alexandre dos S. Roque Edison P. de Freitas Carlos E. Pereira Graduate Program on Electrical Engineering (PPGEE)-UFRGS Graduate Program on Electrical Engineering - URI Competence Center Embrapii on Digital Agriculture - SENAI-RS

This paper explores the fault susceptibility of in-vehicle communication protocols. It proposes integrating aspect-oriented concepts to model common faults in the design phases of embedded systems and faults as non-functional requirements NFR. An analytical case study was conducted considering the tests of electrical fast transients (EFT) injection presented in previous works and based on data collected during these experiments. A fault tree analysis was conducted to determine the effect of the faults in the networked control system. Results based on a single-time approach reveal adverse effects (CAN: 0.622, CAN-FD: 0.352, FlexRay: 0.730). The research contributes to mitigating the impact of EFT faults on in-vehicle communication networks, enabling more specific fault analysis.

关键词： Fault tree analysis electrical Fast Transients Modeling In-vehicle communication

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A Nonlinear Adaptive H∞ Control with Finite-Time Stability and Exact Parameter Estimation∗

A Nonlinear Adaptive H∞ Control with Finite-Time Stability ...

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63rd IEEE Conference on Decision and Control, CDC 2024

作者： Campos, Jonatan M. Cardoso, Daniel N. Raffo, Guilherme V. Graduate Program in Electrical Engineering MG Belo Horizonte31270-901 Brazil Ufmg Department of Electrical Engineering MG Belo Horizonte Brazil Ufmg Department of Electronic Engineering MG Belo Horizonte Brazil

ISBN: (纸本)9798350316339

This work addresses the problem of adaptive control of Euler-Lagrange systems considering unknown parameters without the hypothesis that the persistence of excitation (PE) condition holds. A systematic framework to obtain linear regression equations in accordance with the dynamic regressor extension and mixing (DREM) technique is proposed involving the notion of the Euler-Lagrange first integral. Then, we develop a novel robust nonlinear adaptive H∞ controller capable of ensuring both convergence of the estimated unknown parameters and trajectory tracking in finite-time under a more relaxed condition than the PE assumption. The effectiveness of the proposed robust nonlinear adaptive H∞ controller is corroborated through numerical experiments with a simplified CRS-A465 robot manipulator. © 2024 IEEE.

关键词： Lagrange multipliers

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Time-Domain Analysis of Protection Systems - Assessing the Behavior of Overcurrent Function of Harmonic Filters During Energizations

Time-Domain Analysis of Protection Systems - Assessing the B...

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Workshop on Communication Networks and Power Systems (WCNPS)

作者： João R. Soares De Souza Felipe Vidotti Monteiro Filipe B. Resende Alberto De Conti UFMG - Universidade Federal de Minas Gerais Vale S. A. PPGEE - Graduate Program in Electrical Engineering - UFMG

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Inductive Voltage Transformer Model for High-Frequency Studies

Inductive Voltage Transformer Model for High-Frequency Studi...

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Workshop on Communication Networks and Power Systems (WCNPS)

作者： Érico E. B. Mendes Ana Clara S. Assis Marcello H. M. Pinto Alberto De Conti PPGEE/UFMG - Graduate Program in Electrical Engineering LRC - Lightning Research Center UFMG - Universidade Federal de Minas Gerais

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