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  • CSF-PC based grid tied improved hybrid three quasi Z source converter
    COMPEL (IF 0.59) Pub Date : 2020-08-03
    Ramanjaneyulu Alla; Anandita Chowdhury

    Purpose A new control method is proposed for grid integration of improved hybrid three quasi z source converter (IHTQZSC). The proposed controller provides a constant switching frequency with an improved dynamic response with fewer computations. The proposed constant switching frequency predictive controller (CSF-PC) does not need weighting factors and reduces the complexity of the control circuit

    更新日期:2020-08-04
  • Investigation of convolutional neural network U-net under small datasets in transformer magneto-thermal coupled analysis
    COMPEL (IF 0.59) Pub Date : 2020-08-03
    Ruohan Gong; Zuqi Tang

    Purpose This paper aims to investigate the approach combine the deep learning (DL) and finite element method for the magneto-thermal coupled problem. Design/methodology/approach To achieve the DL of electrical device with the hypothesis of a small dataset, with ground truth data obtained from the FEM analysis, U-net, a highly efficient convolutional neural network (CNN) is used to extract hidden features

    更新日期:2020-07-30
  • Characterization of rotor losses in permanent magnet machines
    COMPEL (IF 0.59) Pub Date : 2020-07-27
    Antomne Caunes; Noureddine Takorabet; Sisuda Chaithongsuk; Laurent Duranton

    Purpose The purpose of this paper is to present a synthesis of the analysis and modeling of the rotor losses in high speed permanent magnets motors. Design/methodology/approach Three types of losses are as a result of eddy currents in the conductive parts of the rotor. The analysis includes their characterization and the setup of a numerical model using finite element method. The adopted methodology

    更新日期:2020-07-28
  • Application of new algorithms on asymmetric cascaded multilevel inverter
    COMPEL (IF 0.59) Pub Date : 2020-07-24
    Ashraf Yahya; Syed M. Usman Ali; Muhammad Farhan Khan

    Purpose Multilevel inverter (MLI) is an established design approach for inverter applications in medium-voltage and high-voltage range of applications. An asymmetric design synthesizes multiple DC input voltage sources of unequal magnitudes to generate a high-quality staircase sinewave comprising a large number of steps or levels. However, the implications of using sources of unequal magnitudes results

    更新日期:2020-07-24
  • 3-D adaptive FEA with weighted node density technique
    COMPEL (IF 0.59) Pub Date : 2020-07-15
    Tadashi Yamaguchi; Yoshihiro Kawase; Shota Ishimura

    Purpose This paper aims to propose a method to create 3-D finite element meshes automatically using the Delaunay tetrahedralization with the weighted node density technique. Using this method, the adaptive finite element analysis (FEA) was carried out for the calculation of the magnetic field of an eddy current verification model to clarify the usefulness of the method. Moreover, the error evaluation

    更新日期:2020-07-22
  • Irreversible demagnetization analysis of RWAFPM motor using modified MEC algorithm
    COMPEL (IF 0.59) Pub Date : 2020-07-22
    Farshid Mahmouditabar; Abolfazl Vahedi; Pourya Ojaghlu; Noureddine Takorabet

    Purpose This paper aims to present a modified MEC algorithm for demagnetization modeling of the PM motor. One of the major issues that the designers of the permanent magnet (PM) motors are faced with is the demagnetization of magnets because of high temperatures and armature reaction. Demagnetization will weaken the magnetic properties of the magnet and lead to a reduction in the performance of the

    更新日期:2020-07-22
  • Effect of magnetic slot wedge on the performance of bulb tubular turbine generator
    COMPEL (IF 0.59) Pub Date : 2020-07-22
    Hongbo Qiu; Xutian Zou; Xiaobin Fan

    Purpose Owing to the salient pole structure and stator slots of hydro-generator, the air gap magnetic field in the generator is unevenly distributed. High-frequency harmonic components contained in the inhomogeneous air gap magnetic field will have a negative impact on the generator performance. The purpose of this paper, therefore, is to improve the distribution of air gap magnetic field by using

    更新日期:2020-07-22
  • Simulation of induction thermography NDT technique using SIBC
    COMPEL (IF 0.59) Pub Date : 2020-07-03
    Abdoulaye Ba; Huu Kien Bui; Gérard Berthiau; Didier Trichet; Guillaume Wasselynck

    Purpose This paper aims to present a lightened 3D finite element model (FEM) for coupled electromagnetic thermal simulation of the induction thermography non-destructive testing (NDT) technique to reduce the computation time. Design/methodology/approach The time harmonic electromagnetic problem is expressed in A – ϕ formulation and lightened by using the surface impedance boundary condition (SIBC)

    更新日期:2020-07-20
  • Analysis of electrical circuits supplied by sequence of impulses
    COMPEL (IF 0.59) Pub Date : 2020-07-13
    Zhivko Georgiev; Ivan Trushev

    Purpose This paper aims to analyze transient and steady state processes in series resistive capacitive-circuits when the supplied voltage is a sequence of periodic rectangular pulses. The purpose is to obtain an analytical formula for the capacitor voltage at any instant of time, both for the transient and the steady-state processes. Design/methodology/approach The main approach is to use a combination

    更新日期:2020-07-20
  • Unstructured PEEC method with the use of surface impedance boundary condition
    COMPEL (IF 0.59) Pub Date : 2020-05-20
    Gerard Meunier; Quang-Anh Phan; Olivier Chadebec; Jean-Michel Guichon; Bertrand Bannwarth; Riccardo Torchio

    Purpose This paper aims to study unstructured-partial element equivalent circuit (PEEC) method for modelling electromagnetic regions with surface impedance condition (SIBC) is proposed. Two coupled circuits representations are used for solving both electric and/or magnetic effects in thin regions discretized by a finite element surface mesh. The formulation is applied in the context of low frequency

    更新日期:2020-07-20
  • A bicomplex finite element method for wave propagation in homogeneous media
    COMPEL (IF 0.59) Pub Date : 2020-05-13
    Thomas Reum; Hannes Toepfer

    Purpose The purpose of this paper is to present the advantageous applicability of the bicomplex analysis in the context of the Finite Element Method (FEM). This method can be applied for wave propagation problems in various environments. Design/methodology/approach In this paper, the bicomplex number system is introduced and accordingly the differential equation for time-harmonic Maxwell’s equations

    更新日期:2020-07-20
  • Spurious radiation suppression in microstrip monopulse antenna
    COMPEL (IF 0.59) Pub Date : 2020-05-11
    Rasime Uyguroğlu; Allaeldien Mohamed Hnesh; Muhammad Sohail; Abdullah Y. Oztoprak

    Purpose This paper aims to introduce a new novel microstrip monopulse comparator system to reduce the spurious radiation from the comparator and the feed network for achieving better radiation performance. Design/methodology/approach Two substrate layers have been used for the microstrip monopulse comparator system. The feed network and the comparator circuits are on the first substrate layer and the

    更新日期:2020-07-20
  • Axial claw pole motor: harmonic torque estimation using finite element method
    COMPEL (IF 0.59) Pub Date : 2020-07-10
    Dominique Giraud; Baptiste Ristagno; Denis Netter; Julien Fontchastagner; Nicolas Labbe; Vincent Lanfranchi

    Purpose This paper aims to propose a method to evaluate the information obtained on harmonics calculations and to estimate the precision of results using finite element method for an innovative motor topology in which some well-known meshing rules are difficult to apply. Design/methodology/approach The same magnetostatic problem is solved with several mesh sizes using both scalar and vector potentials

    更新日期:2020-07-20
  • A thermal extension and loss model for Tellinen’s hysteresis model
    COMPEL (IF 0.59) Pub Date : 2020-06-25
    Jan Kühn; Andreas Bartel; Piotr Putek

    Purpose The thermally extended Tellinen model (Kühn et al., to appear) is here investigated and equipped with a hysteresis loss model, while preserving its simple structure. Design/methodology/approach As in the original model, these approaches are based upon phenomenal observations and measured saturation curves. The authors start with the original model and step-by-step add their extensions, such

    更新日期:2020-07-20
  • Wideband performance limitations of the C-FDTD in the discretization impoverishment of a curved surface
    COMPEL (IF 0.59) Pub Date : 2020-06-30
    Lucas Lobo Latorre Fortes; Sandro Trindade Mordente Gonçalves

    Purpose This paper aims to explore the limitations of the conformal finite difference time-domain method (C-FDTD or Dey–Mittra) when modeling perfect electric conducting (PEC) and lossless dielectric curved surfaces in coarse meshes. The C-FDTD is a widely known approach to reduce error of curved surfaces in the FDTD method. However, its performance limitations are not broadly described in the literature

    更新日期:2020-07-20
  • Transient quasi-3D magneto-thermal analytical solution in PM induction heating device
    COMPEL (IF 0.59) Pub Date : 2020-05-23
    Ammar Abdi; Youcef Ouazir; Georges Barakat; Yacine Amara

    Purpose This paper aims to develop a new quasi-three dimensional (3D) analytical model devoted to the study of nonlinear transient magneto-thermal coupled problems in permanent magnet (PM) transverse flux induction heating device (TFIHD). Design/methodology/approach The presented work is based on analytical development of strongly coupled problem, including electromagnetic and thermal boundary problems

    更新日期:2020-07-20
  • A novel and accurate analytical-numerical method for inrush current modeling of three-limb power transformers
    COMPEL (IF 0.59) Pub Date : 2020-07-14
    Mohammad Ali Taghikhani; Zahra Taghikhani

    Purpose Using appropriate solution techniques for transformer inrush current transient study is of great prominence owing to the inevitable inclusion of differential equations leading to complicated analysis procedures. This study aims to propose an analytical-numerical method to accurately analyze the three-phase three-limb core-type transformer inrush current in different cases considering the nonlinear

    更新日期:2020-07-20
  • A fault tolerant sensorless position estimation scheme for switched reluctance motor at low speed
    COMPEL (IF 0.59) Pub Date : 2020-05-11
    Feng Dong; Hao Chen; Shuai Xu; Sihang Cui

    Purpose This paper aims to present a novel position sensorless control scheme with fault-tolerance ability for switched reluctance motor at low speed. Design/methodology/approach First, the detection pulses are injected in the freewheeling and idle intervals of each phase. Second, the aligned position of each phase can be detected by comparing the consecutive rise time of detection current. Third,

    更新日期:2020-07-20
  • Model order reduction techniques applied to magnetodynamic T-Ω-formulation
    COMPEL (IF 0.59) Pub Date : 2020-05-11
    Fabian Müller; Lucas Crampen; Thomas Henneron; Stephane Clénet; Kay Hameyer

    Purpose The purpose of this paper is to use different model order reduction techniques to cope with the computational effort of solving large systems of equations. By appropriate decomposition of the electromagnetic field problem, the number of degrees of freedom (DOF) can be efficiently reduced. In this contribution, the Proper Generalized Decomposition (PGD) and the Proper Orthogonal Decomposition

    更新日期:2020-07-20
  • Dynamic output feedback control for nonlinear large-scale interconnected systems
    COMPEL (IF 0.59) Pub Date : 2020-05-18
    Ezzeddine Touti; Ali Sghaier Tlili; Muhannad Almutiry

    Purpose This paper aims to focus on the design of a decentralized observation and control method for a class of large-scale systems characterized by nonlinear interconnected functions that are assumed to be uncertain but quadratically bounded. Design/methodology/approach Sufficient conditions, under which the designed control scheme can achieve the asymptotic stabilization of the augmented system,

    更新日期:2020-07-20
  • Modeling of airgap flux density for the study of stator core vibration in low speed synchronous machines
    COMPEL (IF 0.59) Pub Date : 2020-06-05
    Allan De Barros; Ivan Chabu

    Purpose This paper aims to develop models and simulations focused on the prediction of electromagnetic forces acting on the stator core of a synchronous machine. It contributes to the study of stator core vibrations. Design/methodology/approach An analytical model based on the rotating fields’ theory including the damper winding contribution was developed. Such model allows the comprehension of airgap

    更新日期:2020-07-20
  • Analytical solution of the Duffing equation
    COMPEL (IF 0.59) Pub Date : 2020-06-25
    Zhivko Georgiev; Ivan Trushev; Todor Todorov; Ivan Uzunov

    Purpose The purpose of this paper is to find an exact analytical expression for the periodic solutions of the double-hump Duffing equation and an expression for the period of these solutions. Design/methodology/approach The double-hump Duffing equation is presented as a Hamiltonian system and a phase portrait of this system has been found. On the ground of analytical calculations performed using Hamiltonian-based

    更新日期:2020-07-20
  • Transient performance of a magnetically geared induction machine
    COMPEL (IF 0.59) Pub Date : 2020-07-16
    Badr-El-Boudour Bidouche; Thierry Lubin; Smaïl Mezani

    Purpose The purpose of this paper is to investigate the transient performance of an induction machine coupled with a magnetic gear for industrial applications with low speed and high torque requirements. This new solution increases mechanical reliability and does not require maintenance and lubrication. The main objective is to study the direct-on-line starting ability of the electrical machine and

    更新日期:2020-07-20
  • Switching harmonic suppression design based on multi-objective optimization algorithm with constraint processing
    COMPEL (IF 0.59) Pub Date : 2020-07-13
    Songtao Huang; Jie Ye; Haozhe Wang; Baojin Li; Anwen Shen; Junli Deng

    Purpose Traditional switching harmonic suppressor design methods require domain experts to adjust design parameters due to various complex performance requirements and practical limitations in switching ripple suppressor designs. The purpose of this paper is to present a method for filter parameter design. Design/methodology/approach An improved non-dominated sorting genetic algorithm II (NSGA II)

    更新日期:2020-07-20
  • Parameter identification of solar cells and fuel cell using improved social spider algorithm
    COMPEL (IF 0.59) Pub Date : 2020-06-30
    Hadi Kashefi; Ahmad Sadegheih; Ali Mostafaeipour; Mohammad Mohammadpour Omran

    Purpose To design, control and evaluate photovoltaic (PV) systems, an accurate model is required. Accuracy of PV models depends on model parameters. This study aims to use a new algorithm called improved social spider algorithm (ISSA) to detect model parameters. Design/methodology/approach To improve performance of social spider algorithm (SSA), an elimination period is added. In addition, at the beginning

    更新日期:2020-07-20
  • Application of discrete differential operators of periodic functions to solve 1D boundary-value problems
    COMPEL (IF 0.59) Pub Date : 2020-07-11
    Tadeusz Sobczyk; Marcin Jaraczewski

    Purpose Discrete differential operators (DDOs) of periodic functions have been examined to solve boundary-value problems. This paper aims to identify the difficulties of using those operators to solve ordinary nonlinear differential equations. Design/methodology/approach The DDOs have been applied to create the finite-difference equations and two approaches have been proposed to reduce the Gibbs effects

    更新日期:2020-07-20
  • Improved 3D electromagnetic analytical model for planar induction heater with consideration of transverse edge effects
    COMPEL (IF 0.59) Pub Date : 2020-06-08
    Mohammed Messadi; Larbi Hadjout; Youcef Ouazir; Hakim Bensaidane; Noureddine Takorabet; Thierry Lubin; Smail Mezani

    Purpose This paper aims to propose a new 3D electromagnetic model to compute translational motion eddy current in the conducting plate of a novel linear permanent magnet (PM) induction heater. The movement of the plate in a DC magnetic field created by a PM inductor generates induced currents that are at the origin of a heating power by Joule effect. These topologies have strong magnetic end effects

    更新日期:2020-07-20
  • New digital background calibration method for pipelined ADCs
    COMPEL (IF 0.59) Pub Date : 2020-06-04
    Ehsan Zia; Ebrahim Farshidi; Abdolnabi Kosarian

    Purpose Pipelined analog-to-digital converters (ADCs) are widely used in electronic circuits. The purpose of this paper is to propose a new digital background calibration method to correct the capacitor mismatch, finite direct current (DC) gain and nonlinearity of residue amplifiers in pipelined ADCs. Design/methodology/approach The errors are corrected by defining new functions based on generalized

    更新日期:2020-07-20
  • Transcranial ultrasonic propagation and enhanced brain imaging exploiting the focusing effect of the skull
    COMPEL (IF 0.59) Pub Date : 2020-06-05
    Stamatis A. Amanatiadis; Georgios K. Apostolidis; Chrysanthi S. Bekiari; Nikolaos V. Kantartzis

    Purpose The reliable transcranial imaging of brain inner structures for diagnostic purposes is deemed crucial owing to the decisive importance and contribution of the brain in human life. The purpose of this paper is to investigate the potential application of medical ultrasounds to transcranial imaging using advanced techniques, such as the total focussing method. Design/methodology/approach Initially

    更新日期:2020-07-20
  • An adaptive sparse polynomial-chaos technique based on anisotropic indices
    COMPEL (IF 0.59) Pub Date : 2020-05-21
    Christos Salis; Nikolaos V. Kantartzis; Theodoros Zygiridis

    Purpose The fabrication of electromagnetic (EM) components may induce randomness in several design parameters. In such cases, an uncertainty assessment is of high importance, as simulating the performance of those devices via deterministic approaches may lead to a misinterpretation of the extracted outcomes. This paper aims to present a novel heuristic for the sparse representation of the polynomial

    更新日期:2020-07-20
  • Parametric dependence of lightning impulse behavior of grounding electrodes buried in a dispersive and ionized lossy soil under first- and subsequent-stroke currents
    COMPEL (IF 0.59) Pub Date : 2020-05-09
    Seyed Sajad Sajadi; Saeed Reza Ostadzadeh; Seyed Hossein Hesamedin Sadeghi

    Purpose The purpose of this paper is to investigate the simultaneous effects of ionization and dispersion of soil on the impulse behavior of grounding electrodes under first and subsequent stroke currents. Design/methodology/approach A recently introduced technique called improved multi-conductor transmission line (MTL) is simplified for grounding electrodes buried in both-affected soils. Findings

    更新日期:2020-05-09
  • Investigation on the shaft voltage generation of large synchronous turboalternators
    COMPEL (IF 0.59) Pub Date : 2020-05-08
    Kevin Darques; Abdelmounaïm Tounzi; Yvonnick Le-menach; Karim Beddek

    Purpose This paper aims to go deeper on the analysis of the shaft voltage of large turbogenerators. The main interest of this study is the investigation process developed. Design/methodology/approach The analysis of the shaft voltage because of several defects is based on a two-dimensional (2D) finite element modeling. This 2D finite element model is used to determine the shaft voltage because of eccentricities

    更新日期:2020-05-08
  • Modeling the electric field at interfaces and surfaces in high-voltage cable systems
    COMPEL (IF 0.59) Pub Date : 2020-05-08
    Christoph Jörgens; Markus Clemens

    Purpose In high-voltage direct current (HVDC) cable systems, space charges accumulate because of the constant applied voltage and the nonlinear electric conductivity of the insulating material. The change in the charge distribution results in a slowly time-varying electric field. Space charges accumulate within the insulation bulk and at interfaces. With an operation time of several years of HVDC systems

    更新日期:2020-05-08
  • Design techniques for cogging torque reduction in a fractional-slot PMBLDC motor
    COMPEL (IF 0.59) Pub Date : 2020-05-06
    Lidija Petkovska; Paul Lefley; Goga Vladimir Cvetkovski

    Purpose This paper presents the design techniques applied to a novel fractional-slot 6/4 pole permanent magnet brushless direct current (PMBLDC) motor, for cogging torque reduction. The notable feature of this motor is the simplicity of the design and low production cost. The purpose of this paper is to reduce the peak cogging torque of the motor. The focus is put on the stator topology tuning, and

    更新日期:2020-05-06
  • Multi-physics analysis of a novel circular pantograph catenary system for high-speed trains
    COMPEL (IF 0.59) Pub Date : 2020-05-04
    Song Xiao; Yuanpei Luo; Jingchi Wu; Can Zhang; Yang Rao; Guangning Wu; Jan Sykulski

    Purpose In high-speed trains, the energy is supplied from a high voltage catenary to the vehicle via a pantograph catenary system (PCS). Carbon pantograph strips must maintain continuous contact with the wire to ensure safety and reliability. The contact is often confined to a particular spot, resulting in excessive wear due to mechanical and thermal damage, exacerbated by the presence of an electric

    更新日期:2020-05-04
  • Guest editorial
    COMPEL (IF 0.59) Pub Date : 2020-05-04
    Valeri Mladenov; Wolfgang Mathis

    更新日期:2020-05-04
  • Improved Jaya algorithm-based FOPID/PID for AVR system
    COMPEL (IF 0.59) Pub Date : 2020-05-01
    Jailsingh Bhookya; Ravi Kumar Jatoth

    Purpose This paper aims to get the optimal controller parameters of fractional order proportional integral derivative (FOPID)/proportional integral derivative (PID) i.e. Kp, Ki, Kd, λ and µ for designing controller in automatic voltage regulator (AVR) system. Design/methodology/approach A novel method is proposed to get the optimal controller parameters for designing controller in AVR system using

    更新日期:2020-05-01
  • Two-way coupling of thin shell finite element magnetic models via an iterative subproblem method
    COMPEL (IF 0.59) Pub Date : 2020-04-27
    Vuong Quoc Dang; Christophe Geuzaine

    Purpose The purpose of this paper is to deal with the correction of the inaccuracies near edges and corners arising from thin shell models by means of an iterative finite element subproblem method. Classical thin shell approximations of conducting and/or magnetic regions replace the thin regions with impedance-type transmission conditions across surfaces, which introduce errors in the computation of

    更新日期:2020-04-27
  • Electro-quasistatic field-simulation of biological cells using balanced domain-decomposition
    COMPEL (IF 0.59) Pub Date : 2020-04-23
    Sebastian Böhmelt; Nils Kielian; Michael Hagel; Marcus Stiemer; Marvin-Lucas Henkel; Markus Clemens

    Purpose The purpose of this paper is to present the implementation of a balanced domain decomposition approach for the numerical simulation of large electro-quasistatic (EQS) systems in biology. The numerical scheme is analyzed and first applications are discussed. Design/methodology/approach The scheme is based on a finite element discretization of the individual domains obtained by decomposition

    更新日期:2020-04-23
  • High-performance combined ring oscillators
    COMPEL (IF 0.59) Pub Date : 2020-04-16
    Masoud Soltani; Farzan Khatib; Seyyed Javad Seyyed Mahdavi Chabok

    Purpose The purpose of this paper is to investigate a more robust ring oscillator. Less sensitivity to power supply variations is a target. This is important since low-quality ring oscillators could be exploited in numerous systems to reduce die costs. Design/methodology/approach The method in this work is large signal analysis. Delay time as the large signal parameter is calculated symbolically to

    更新日期:2020-04-16
  • Water cycle algorithm-based PID controller for AVR
    COMPEL (IF 0.59) Pub Date : 2020-04-13
    Nikhil Pachauri

    Purpose In a power system, the purpose of automatic voltage regulator (AVR) is the voltage control of synchronous generator. Power system stability and security depends on the AVR. Design/methodology/approach The present work is concentrated on the precise terminal voltage control of AVR system and simultaneously maintaining the stability of the system. Therefore, an optimal proportional–integral–derivative

    更新日期:2020-04-13
  • Magnetic shielding of a thin Al/steel/Al composite
    COMPEL (IF 0.59) Pub Date : 2020-04-13
    Paul Clérico; Xavier Mininger; Laurent Prévond; Thierry Baudin; Anne-Laure Helbert

    Purpose This paper aims to investigate the efficiency of a laminated composite for shielding applications. The solution has to be efficient not only for the shield against static magnetic fields but also “for low-frequency ones, in order to be well-suited for applications with electromagnetic perturbations in the frequency range DC to 100 kHz.” Design/methodology/approach The composite constituted

    更新日期:2020-04-13
  • Design of efficient graphene plasmonic coupling circuits for THz applications
    COMPEL (IF 0.59) Pub Date : 2020-04-13
    Stamatis A. Amanatiadis; Theodoros Zygiridis; Nikolaos V. Kantartzis

    Purpose The coupling characteristics between adjacent circuits are crucial for their efficient design in terms of electromagnetic compatibility features. Specifically, either the wireless power transfer can be enhanced or the interference can be limited. This paper aims to the extraction of the coupling characteristics of surface plasmon polariton waves propagating onto graphene layers to facilitate

    更新日期:2020-04-13
  • Scattering by cracks in a conducting surface
    COMPEL (IF 0.59) Pub Date : 2020-04-02
    Ralf T. Jacobs; Arnulf Kost

    Purpose The purpose of this study is the formulation of an efficient method to compute and analyse the scattering characteristics of cracks or grooves in a conducting object, where the size of the crack is significantly larger than the wavelength of an incident plane wave. Design/methodology/approach A hybrid finite element-boundary element procedure is formulated for the computation of the scattering

    更新日期:2020-04-02
  • Measurement of the leakage flux in the vicinity of a transformer core: Application to detection and localization of faults
    COMPEL (IF 0.59) Pub Date : 2020-03-27
    Stéphane Duchesne; Fabrice Morganti; Carl Shulz; Daniel Roger

    Purpose This study presents a new method for the detection of faults in large transformer cores. It is based on the analysis of leakage flux components in the vicinity of the sheet stack. The purpose of this study is to provide a nondestructive analysis tool for transformer cores during the assembly process to detect accidental defects such as inter-laminar short circuits. Design/methodology/approach

    更新日期:2020-03-27
  • Analysis of a wind farm with SCIG integrated into a high power system
    COMPEL (IF 0.59) Pub Date : 2020-03-27
    Dian Malamov; Ivan Hadzhiev; Vasilina Zlatanova; Snejana Terzieva; Aleksandar Georgiev

    Purpose The aim of this paper is a steady-state analysis of the basic electrical characteristics of a wind farm with squirrel-cage induction generators (SCIG), integrated into a high power system. The SCIG are connected to the system by means of a step-up substation 21/115 kV, realized by cable lines. Design/methodology/approach The analyses have been done with the help of a computer model, developed

    更新日期:2020-03-27
  • Analysis of memristor-based differentiating circuit
    COMPEL (IF 0.59) Pub Date : 2020-03-11
    Stoyan Kirilov; Ivan Zaykov

    Purpose The purpose of this paper is to propose a detailed analysis of a memristor-based differentiating circuit with buffering amplifier, a capacitor and a memristor. Design/methodology/approach The analyzed circuit is based on a resistor–capacitor differentiating scheme together with a buffering operational amplifier. In the proposed circuit, the resistor is replaced by a memristor element. Findings

    更新日期:2020-03-11
  • Analysis of the structure of different optimization strategies
    COMPEL (IF 0.59) Pub Date : 2020-03-02
    Alexander Zemliak; Jorge Espinosa-Garcia

    Purpose In this paper, on the basis of a previously developed approach to circuit optimization, the main element of which is the control vector that changes the form of the basic equations, the structure of the control vector is determined, which minimizes CPU time. Design/methodology/approach The circuit optimization process is defined as a controlled dynamic system with a special control vector.

    更新日期:2020-03-02
  • Quadrupolarisability extraction for planar metamaterial scatterers via far-field response
    COMPEL (IF 0.59) Pub Date : 2020-01-29
    Theodosios Karamanos; Stamatis A. Amanatiadis; Theodoros Zygiridis; Nikolaos V. Kantartzis

    Purpose The majority of first-principle, homogenisation techniques makes use of the dipole terms of a small particle radiation, and, consequently, the respective dipole polarisabilities. This paper aims to take the next step and propose a new systematic technique for extracting the quadrupolarisability of planar metamaterial scatterers. Design/methodology/approach Firstly, it is assumed that the particle

    更新日期:2020-01-29
  • Stochastic investigation of graphene structures with efficient polynomial models
    COMPEL (IF 0.59) Pub Date : 2020-01-25
    Theodoros Zygiridis; Stamatis A. Amanatiadis; Theodosios Karamanos; Nikolaos V. Kantartzis

    Purpose The extraordinary properties of graphene render it ideal for diverse contemporary and future applications. Aiming at the investigation of certain aspects commonly overlooked in pertinent works, the authors study wave-propagation phenomena supported by graphene layers within a stochastic framework, i.e. when uncertainty in various factors affects the graphene’s surface conductivity. Given that

    更新日期:2020-01-25
  • Enhanced method for pulse skin effect calculation of cylindrical conductors
    COMPEL (IF 0.59) Pub Date : 2020-01-25
    Nebojsa B. Raicevic; Slavoljub R. Aleksic; Ilona Iatcheva; Marinko Barukcic

    Purpose This paper aims to present a new approach to the numerical solution of skin effect integral equations in cylindrical conductors. An approximate, but very simple and accurate method for calculating the current density distribution, skin-effect resistance and inductance, in pulse regime of cylindrical conductor, having a circular or rectangular cross-section, is considered. The differential evolution

    更新日期:2020-01-25
  • 100 years multivibrator-history, circuits and mathematical analysis
    COMPEL (IF 0.59) Pub Date : 2020-01-22
    Wolfgang Mathis

    Purpose This work is intended to historically commemorate the one hundredth anniversary of the invention of a new type of electronic circuit, referred to in 1919 by Abraham and Bloch as a multivibrator and by Eccles and Jordan as a trigger relay (later known as a flip-flop). Design/methodology/approach The author also considers the circuit-technical side of this new type of circuit, considering the

    更新日期:2020-01-22
  • Analysis of DC bus bar dominant stray parameters based on equivalent calculation models
    COMPEL (IF 0.59) Pub Date : 2019-11-17
    Shaomin He; Huan Yang; Guangzhuo Li; Sideng Hu; Xiangning He

    Purpose This paper aims to analyze the dominant stray parameters of the DC bus bar and focus on weakening the influence of the stray parameters instead of reducing the value of the stray parameters in DC bus bar while switching. By finding the mechanisms to reduce the effects of stray parameters on switching transient, the simple and straightforward optimization methods could be given for the engineering

    更新日期:2019-11-17
Contents have been reproduced by permission of the publishers.
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