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.
The electric power generation using hydro potential is increasing around the globe due to many reasons like increasing power demand, deregulated markets, and environmental concerns etc. At the same time, extended transmission networks, higher degrees of interconnection between different networks, and fast connection and disconnection of the heavy loads demand flexible, fast power generation and consumption...
The optimal operation of a rail vehicle with on-board energy storage device minimizing energy consumption in catenary free mode is discussed in this paper. The electric double layer capacitor (EDLC) is assumed as an energy storage device because of its high power density, long lifetime and quick charge/discharge. The proposed method can determine the optimal acceleration/deceleration at each sampling...
This paper presents a maximum power point tracking (MPPT) method which is applied on a wind turbine with permanent magnet synchronous generator (PMSG). A three-phase switched mode rectifier (SMR) is connected with the three phase output of the PMSG. The SMR employs a modulation strategy which is based on the space vector modulation (SVM) technique. Thus, the three phase input voltage is divided in...
A coupled system simulator, based on analytical circuit equations and a finite element method (FEM) model of the motor, is used to analyze a direct-torque-controlled (DTC) frequency-converter-fed industrial 200 kW squirrel-cage induction motor. The measured stator voltage waveforms are used as inputs to the FEM motor model, and the results are compared with the measured ones. Comparison is also made...
The paper deals with the automatic generation of global model of static converters without the description of their environment. The considered models are average and exact models (i.e. with ideal switches). These models are obtained by using a software tool named AMG (for Average Model Generator) with a priori on the control mode and behaviour of the static converter. In this paper, an extension...
This paper presents a review of some techniques for islanding detection, especially by using inverter based DG applications and it also focuses on several islanding detection methods for a single-phase current-control voltage inverter working with a PV system connected into the grid. It is deliberated a single-phase inverter with maximum power of 5 kW. Islanding detection methods are investigated,...
Recent innovation in vehicle systems has brought the extensive application of power electronics (PE) technology, which in turn has made the system more complex. The vehicle system is a multi-domain system, so that computer simulation has become an indispensable tool for vehicle system analysis. We propose a simulation method for the complex vehicle system based on the VHDL-AMS language. A multi-level...
This paper presents a methodology for modeling the high-voltage silicon carbide (SiC) MOSFET/junction-barrier Schottky (JBS) diode power modules. The electrical model of an actual high-voltage SiC MOSFET/JBS module has been obtained using computer-aided electromagnetic analysis and verified through measurements. A circuit simulation model of a 2 kV, 5 A 4-H SiC MOSFET has also been built based on...
This paper presents a simulation work and control aspects of a Booster Dipole magnet power supply to a light source. Description of structure, operation of the structure and synchronous rectification Buck converter are discussed. Voltage and Current mode controllers for one-quadrant and two-quadrant converters are proposed. Better performance results with Split-Range technique are obtained. The converters...
Operating single phase induction motors across a wide range of speed and load with high efficiency is still of interest. In the paper at hand the suitability of several different capacitor run single phase induction machines for phase control, integral (half) cycle control or integral switched cycle control is investigated. The induction machine's model's electrical and mechanical parameters are estimated...
This paper presents a main flux oriented model of an induction machine which considers the saturation in both magnetizing and leakage inductances. The model is based on a virtual air gap. With this model it is possible to simulate the saturation characteristic and the cross-saturation effect. The validity of these results is proved with measurements on a test bench. A procedure is presented that shows...
Dynamical phenomena like oscillations and instability in railway power systems have come into concern in the experts' community the recent years. In several occasions, modern advanced electrical rail vehicles have been a source for low-frequency power oscillations leading to an unstable power system due to lack of damping, and as a consequence operational problems. Traditionally the dynamical behaviour...
Electromagnetic interference (EMI) in adjustable speed drives (ASD) with long feeders are of great significance today. Various simulation models have been developed for inverter, cable and motor. Also different simplifications degrees were adopted to ease the simulation burden. In this paper simplified time domain simulation models for inverter, cable and motor are analyzed, implemented and connected...
Simulation tools for learning power electronics are grounded aimed to study the circuit structure and execution and to evaluate the working possibilities in different duty modes of operation. The power converter estimation factors, features and characteristics are evaluated. Detailed explanation of the models of AC/DC, DC/AC, AC/AC AND DC/DC power converters and their control circuits is given. The...
A free SPICE version allowing general circuit simulation is used teaching power electronics. There is no lock on the circuit size, stabile and user friendly operation is experienced. A collection of transformer, converter and drive system models are implemented to investigate the usability of the programme in high power electronics.
This paper focuses on the effects of voltage sags, both symmetrical and unsymmetrical, on the three-phase synchronous machine (SM). Voltage sags on SM cause speed variations, current and torque peaks and hence may cause tripping and equipment damage. The consequences of voltage sags on the machine behaviour depend on different factors such as sag's magnitude (or depth), duration, initial point-on-wave...
A library of components for simulation and analysis of large vehicular electrical power systems using Modelica language is presented. Components are described using different levels of model complexity, catering for both detailed high fidelity transient switching dynamics and averaged value descriptions which, being time invariant, are a computationally efficient and useful tool for design, stability...
The paper derives an analytical state-space average-value model of the direct symmetric topology of an 18-pulse AC-DC rectifier. The dynamic characteristics of the rectifier are fully represented while the model is time invariant and computationally efficient. The developed model, validated with comparison of the resultant transient and steady state behaviors with those obtained from detailed simulations...
The goal of this research is to reduce the common mode current in inverter system. To reach the goal, it is important to understand the behavior of common mode current precisely in the inverter circuits. Recently, computer simulation is widely used for this issue according to create good simulation model for individual electric component in used inverter system. The simulation results/accuracies are...
In this paper a DC power plant for base transceiver station power supply is investigated. The supply system employs clean alternative energy sources, namely photovoltaic (PV) modules, wind turbines, a fuel cell as backup generator and a storage battery bank. A detailed description is made and experimental data are shown of a prototype system where the PV modules are directly connected to the DC bus...
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.