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2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP)
This paper presents the results of voltage and current Total Harmonic Distortion (THD) minimization for a three-phase cascaded H-bridge inverter with a fundamental staircase modulation. Theoretically optimal switching angles are found using THD minimization time domain constraint optimization problem formulations. Numerically obtained optimal switching angles and minimal voltage and current THD values...
Multiphase Switched Capacitor Converters (SCC) recently gained attention due to their ability to generate different voltage Target Ratios (TR). One of the reconfigurable multiphase SCC topologies is a binary one. For this SCC, the switched capacitor normalized voltage distribution is binary as the name implies and each capacitor represents a single bit. This paper suggests SCC topologies that are...
Sustainable use of energy through an increased public and individual awareness is an important goal from several perspectives: it is a useful mean to obtain energy savings based on users behavior change, it is a way to understand the local and general context of energy ecosystem related to renewable energy contribution and to carbon footprint and its possible correlation with ambient factors. Thus...
The purpose of this paper is to estimate the efficiency of the inverter circuits used for the Photovoltaic (PV) systems. The analysis of a power electronics converter with the SPICE during the steady-state operation takes a long time and the results may not be obtained accurately due to convergence problem in the solver. The MATLAB package program is widely preferred to analyze the power electronics...
Lately, new solutions have been added to the control of autonomous grids, which improve the way the power grids operate. These changes may affect the reliability and safety of power distribution grids, the dynamic stability being a real concern. This issue is more prominent in autonomous microgrids (MGs) with high penetration of renewable energy sources. On this topic, this paper aims to study how...
This paper describes design modifications of a brushed permanent magnet DC motor. Test motor is modeled using a Finite Element Method (FEM) based software. Model accuracy is investigated by comparing measurement and simulation results. Reducing material consumption in motor fabrication while the motor develops the desired torque at a higher efficiency is aimed in this paper. Modifications are done...
Modeling and performance prediction of permanent magnet generator (PMG) in healthy and faulty cases are necessary for fault diagnosis of the machine. Application of the PMG for wind energy conversion is reviewed in this paper. Importance of fault diagnosis particularly eccentricity fault is emphasized. Typical eccentricity faults in practice and importance of experimental results for fault index validation...
Hardware-in-the-loop (HiL) systems nowadays become popular. During the HiL creation process it is important to select a proper numerical method because the accuracy of the process simulation, in case of the HiL, depends on the correct numerical approach selection. That is why it is important to evaluate the most popular numerical approaches. The “Sequential” Euler (solves equations step-by-step),...
This paper investigates the influence of finite-element (FE) mesh when computing eddy currents in magnets of a permanent-magnet synchronous machine excited with pulsating currents (such as pulse-width modulation). 3D computations with globally and locally varying mesh densities are performed and results are compared with a reference (fine-mesh) case. It turns out that a global increase of mesh density...
This paper deals with the optimization of a single side Axial Flux Permanent Magnet machine (AFPMM) designs with respect to cogging torque. Although the AFPMMs run generally at high speed and high torque, these machines may run at lower operational speed for aircraft applications. At lower operational speed, the cogging torque is an undesirable effect. Firstly, a reference AFPMM is designed with Finite...
This paper presents a dq0 flux-linkage based electrical model for permanent-magnet synchronous machines. To obtain the relationship between dq0 flux-linkages and currents, a series of magnetostatic finite-element calculations for various dq0 currents at different rotor positions is carried out. This dataset has then to be inverted to avoid having to derive the flux-linkages in Simulink, thus improving...
The purpose of this article is to perform a modal analysis for a three phase induction motor (11kW–1000 rpm), premium efficiency IE3 category. Modal analysis involves determining the frequencies and vibration modes. The analysis was accomplished on the main components of the motor and the entire assembly.
A Ladybird High Speed Synchronous Reluctance Machine (LB-HS-SynRM) with deterministic rotor parameterization has been studied. The primary aim is to derive design rules for SynRM optimization with a novel Ladybird rotor topology. The second goal is to investigate the effect of parameters on machine performance. The 3D nature of the rotor can only be handled by 3D FEM simulations, therefore, 3D FEM...
Induction motor is utilized in wide area of electric drive applications. If sophisticated control of speed or torque is required, the actual rotor angular velocity must be known at every time instant. To obtain the speed information, an optical sensor is usually utilized. However, the usage of such sensor brings some undesired effects. The paper compares two very often used methods on a specific induction...
The paper presents the design of non-uniform linear antenna arrays with symmetrical elements, considering linear and parabolic variations for distances between elements and a non-uniform distribution of currents through the elements. Starting from an imposed radiation pattern the coefficients, which describe the linear and parabolic variations of the array antenna parameters, are determined using...
Based on a previously detailed data mining about primary renewable sources concerning solar radiation and wind speed, the authors present some results related to reliability of supply using Bayesian networks (BNs). The paper focuses on how the structure and parameters of BN can be obtained from the data. A short review of learning methods, scoring function types and specific algorithms is included...
Energy conservation is extremely important for the future of mankind. Energy derived from fossil fuel has serious environmental consequences and this needs attention of researchers as well as end users. Renewable energy is attractive but at the same time, fossil fuel based energy cannot be abruptly abandoned. In addition to encouraging use of renewable energy sources, the author of this paper believes...
The aim of this paper is to emphasize an important practical aspect concerning the interaction between non-thermal plasma activated water (PAW) and plastic materials (i.e. polycarbonate) with severe consequences on living organisms' health status in case of ingestion. For this study, PAW was produced using a gliding arc plasma reactor.
Many existing Algorithmic Trading Systems (ATS) use a large number of parameters to improve the results (i.e. accurate market forecasting and maximisation of profit). However, the use of superfluous parameters can often mask underlying trends leading to result instability and an excessive risk. This paper proposes a method for choosing the minimum number of parameters that are necessary and sufficient...
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