The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP)
The recent rapid progress in development of new technologies offers new procedures, which are environmental-friendly. One of such area are modern seed-protective methods based on treatment of seeds by plasma discharges with consequent settling of the surface by protective fungi. These biotechnological approaches represent progressive practices, which may in the future reduce the amount of chemical...
A spark discharge, which was produced between two electrodes made from a Ni3Al alloy, was applied in the production of hydrogen in the steam reforming of ethanol. The influence of the water:ethanol molar ratio and feed flow on the total conversion rate of ethanol, as well as the conversion of ethanol into hydrogen, energy efficiency and selectivity of ethanol conversion to hydrogen, carbon monoxide,...
In this paper, a study of ground and power bounce effect in small digital CMOS circuits is proposed. First, a simplified model of digital CMOS circuit and its operation are analyzed. Then, an analytical method for computing the ground and power bounce, based on differential equations, is detailed. Finally, the effect of ground and power bounce is studied through simulations in two different simulators...
The aim of this paper is the implementation of the control algorithm of an active DC traction substation using the dSpace DS1103 DSP control board. The adopted current control method is the indirect current control, which assumes that the current regulator controls the power grid current instead of the active filter output current. The active character of the traction substation is given, on one hand,...
The hydropower plants have been one of the most important points in the secure operation of the system in the last period. The massive introduction of the renewable energy sources with a variable production, determined the hydropower plants to become a major player in the power system control, helping stabilize fluctuations between demand and supply. The availability, flexibility and reliability of...
Efficacious work of the Li-ion battery (LIB) is strongly influenced by several factors as temperature, nominal voltage, capacity and charge/discharge current rate, determining its health and state-of-charge (SOC). SOC is an indicator mirroring the available charge stored in the battery relative to its maximum capacity when new, resembling the fuel gauge in the conventional, internal combustion engine...
Hardware in the Loop (HiL) supports development processes in many types of applications. Power electronic systems with switching frequencies up to several kilo hertz constitute some of the most demanding applications for the quantization time of the HiL. The non-avoidable delay forces very short calculation periods which lead to high effort in hardware and software implementation. For PWM based controllers...
With the popularity of Electrical Vehicles (EVs), Lithium-ion battery industry is also developing rapidly. To ensure the battery safety usage and reduce the average lifecycle cost, accurate State Of Charge (SOC) tracking algorithms for real-time implementation are required in different applications. Many different SOC estimation methods have been proposed in the literature. However, only few of them...
This paper deals with the start-up analysis of a synchronous reluctance motors (SynRMs) with uniformly distributed cage bars in the rotor structure. Two SynRMs are modelled using 2D Finite Element Method (FEM). The rotors of both motors are built with stamped conventional steel laminations having flux barriers. The first motor model (SynRM1) has closed rotor slots above each flux barrier separated...
In this paper, an observer-based speed sensorless field oriented control (FOC) algorithm is presented for induction machines. The state observer is based on a new, detailed observer model which describes the machine with seven state variables, i.e. with seven equations. Since these equations are strongly non-linear, the applied observer algorithm is the unscented Kalman filter (UKF). Using the advantages...
This paper presents the effects and importance of the rotor design parameters on the performance of a permanent magnet assisted synchronous reluctance motor (PMaSynRM). At the beginning of the design, number of stator slots and rotor flux barriers are considered. Rotor design parameters such as different insulation ratios and magnet positions are investigated after choosing the number of stator slots...
This study presents the direct torque controlled induction motor (IM) drive utilizing a novel extended Kalman filter (EKF) that simultaneously estimates stator stationary axis components of stator currents and stator fluxes in addition to rotor and stator resistances with the assumption of available stator voltages/currents and rotor speed. Thus, it is desired to show that the on-line estimations...
The presented paper deals with the calculation of the electromagnetic torque ripple waveform of an induction machine (IM) in steady state. The motor is supplied by non-harmonic voltages from semiconductor inverter. Mathematical model of the inverter is built on the base of complex Fourier series. Based on the mathematical formulas across the terminal inverter voltages a voltage spatial phasor is derived...
A study is carried out using the Alternative Transients Program (ATP) to simulate a three-phase induction motor fed from a single-phase ac source and balanced with two static var compensators (SVCs). Two methods, a speed feedback (SF) method and a perturbation and observation (PO) method, are proposed to control the SVCs. As per the simulation results, both methods allow the motor to operate as supplied...
The paper presents the inductances and rotor resistance estimation - using FEM - for the closed slot induction machine. One presents the variations of inductances and rotor resistance as function on current and frequency for emphasizing their dependence upon the saturation level of the machine. So it is possible to estimate the machine parameters for a large area of the operating modes.
For different sorts of electrical sheets, the magnetic losses separation using Bertotti method was performed. Using a fitting procedure, the Steinmetz coefficients were approximated. For each parameter, an analytical expression regarding the measured values was determinated. Finally, a comparison between the measured data and the predicted losses was made. The modeled losses are quite close to the...
The purpose of calculation of parameters of magnetically coupled coils using Ansoft Q3D Extractor program is to find out the electric parameters: R, L, C and G.
The movement of know-how or technical knowledge from one organization to another known as knowledge transfer in literature is considered to be one of the most important components of the strategic plan of a research institute. Despite the fact that INCESA (Research Hub of Applied Sciences, University of Craiova) is a young organization, it already counts an important number of collaborations with...
This paper presents a toolbox created with the purpose of offering support for power engineering students to better understand the power system steady-state operation and active power flow control using a phase-shifting transformer (PST). The toolbox consists of a graphical user interface (GUI) that allows the user to define scenarios, run the load-flow calculation and select scenarios in order to...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.