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 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...
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...
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...
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...
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...
This paper presents detailed models and simulators for an electrical on-board marine network. A one machine network is considered, and loads are described, initially, as equivalent RL circuits based on active and reactive powers, which results in a 5th order dynamic system. Then a more refined model with capacitances is proposed, which results in a 9th order dynamic system. This model represents the...
In this paper we present a novel modelling method of the permanent magnet motor. This method depends on the combination of the singular value decomposition (SVD) on the mathematical framework and the energy function method on the physical framework. We take the SVD-based macromodel approach to derive the static characteristics of the motor using only the co-energy. The co-energy is calculated as a...
The paper presents basics to use a compact menu-driven freeware bond graph block library for teaching power oriented modelling. Such energy domain independent modelling methods preserve the physical system structure, are applicably on conventional software and offer furthermore the use of common control structures or analysis tools. Models of electrical machines illustrate the features.
A modeling approach of a power factor correction circuit operating in boundary conduction mode is presented. The PFC is controlled by a constant on-time of the switch. The effect of valley switching is simplified and taken into account as dead-time to generate a large signal model. On the basis a small signal model for the constant on-time controlled PFC voltage loop is derived. The large and small...
This paper presents an educational tool that enables exploring key aspects on semiconductor theory and power circuit analysis. With this tool it is possible to examine with accuracy the influence of device parameters and circuit parameters on circuit dynamic behavior, analyzing switching waveforms and typical switching parameters. The tool invokes an electrical circuit simulator (IsSpice) in order...
When an electric machine is designed, a dynamic model of the machine is advantageous in order to predict the electromagnetic, electric and mechanical behavior. In this paper a new modeling method of the dynamic behavior of the switched reluctance motor is presented. It bases on the macromodelling approach, which gives the advantages of minimum input data for the simulation and acceptable flexibility...
This paper presents the results of the modeling of the HEV with an electric power splitter (EPS) and simulation of the fuel efficiency of this type of vehicle. The new innovative technological approach is presented by using the special type of synchronous machine that splits the mechanical power on two separate power transmission parts and therefore it is called electric power splitter. EPS is based...
This paper presents a comprehensive assessment of small-signal stability for a ldquomore-electricrdquo aircraft power system consisting of a synchronous variable-frequency generator which supplies several power electronic controlled loads via an 18-pulse autotransformer rectifier unit (ATRU) for AC-DC conversion. Functional models for key power system components and loads are derived. Numerical tools...
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.