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Centrifugal pumping systems are the common hydraulic devices mainly driven by electric drives. Their efficiency varies significantly with the change of working point location that depends on the positions of the performance and system curves. This paper is devoted to the study of the pumping system efficiency at throttling and speed control. A model-based calculation method for the single-drive centrifugal...
The loss contribution of a 2.3 kW synchronous GaN-HEMT boost converter for an input voltage of 250 V and an output voltage of 500 V was analyzed. A simulation model which consists of two parts is introduced. First, a physics-based model is used to determine the switching losses. Then, a system simulation is applied to calculate the losses of the specific elements. This approach allows a fast and accurate...
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
The European Project “Batteries 2020” unites nine partners jointly working on research and the development of competitive European automotive batteries. The project aims at increasing both the energy density and lifetime of large format pouch lithium-ion batteries towards the goals targeted for automotive batteries (250 Wh/kg at cell level, over 4000 cycles at 80% depth of discharge). Three parallel...
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
This paper demonstrates a workflow for multi-physical simulation and design optimization of electrical machines using open-source tools. The workflow demonstrates applicability of open-source tools for all steps of complex 3D Finite Element Method modelling of an electrical machine — geometry production, meshing, pre-processing, solving (even in massively parallel environment), and post-processing...
this paper presents an effective and appropriate method to calculate the “hot lumens” of a street-lighting luminaire. The proposed multi-domain LED model is described here with testing simulation results. The practical need for such simulations is demonstrated through an application example.
This paper refers to the dynamic simulation of multiphase permanent-magnet motor drives featuring independent-phases structure. Based on the co-simulation approach with a finite element analysis, a circuital model is developed in which the usual inductive parameters and back-EMF coefficient are replaced by current and rotor position dependent functions, so that the exact electromagnetic nature and...
Inhomogeneous current sharing between parallel IGBTs can compromise the capability of power modules to withstand short circuit events. Especially if the gate voltages are influenced by coupling effects, single IGBTs will carry excessive currents. This paper analyzes the effects of different parameters on the maximum short circuit current of a 1.7kV power module composed of three parallel half bridge...
Rail corrugation is a common rail roughness phenomenon that can deteriorate the reliability, availability, maintainability, and safety of rail transportation. Detection of rail corrugation via the human eyes are labour-intensive and time-consuming. Furthermore, treatment of rail corrugation through routine rail grinding does not stop corrugation from recurring. To better control and monitor rail corrugation...
Voltage source converter (VSC) have achieved rapid development in Power grids all over the world, due to its independent active power and reactive power control ability and other various functions. However, small time-steps are needed for VSCs simulation, because VSCs includes large number of power electronics switches. VSC modelling is studied on the small time-step, using a two-level convertor and...
In this paper the method for managing a line topology and estimating the topological parameter (length of bridge taps and direct line) are investigated. The method will be evaluated in a simulation environment. With the method and system for managing a line topology and related apparatus it is possible to provide a PLC system with information about network and line quality for performing quick diagnosis,...
Technical investigations continuously evaluate the possibility to recover significant amount of braking energy. The application normally involve conventional tramways, characterized by several stops in short-range routes. However, this possibility is becoming more and more attractive also when high-speed trains are considered. In fact, braking energy can be recovered during entry in the station, and...
Electrified guided vehicles are normally equipped with regenerative braking devices, while traction lines are supplied by non-reversible substation, thus allowing braking energy recovery only if nearby other vehicles are absorbing power. To enhance the effectiveness of regenerative braking, some energy storage can be installed along the line. Evaluation of its cost effectiveness requires time domain...
A hardware-in-the-loop model of a centrifugal pump is proposed. The new simulator consists of the pump and pipeline imitators built on the basis of the variable speed drives connected via the programmable logical controller and Profibus communication components. The mathematical description of the flow maintenance represents a core of the simulation methodology. To study the system, a series of tests...
This paper examines dynamics of escalator energy consumption in different passenger volumes with a simulation model of an existing escalator pair installation. The model segregates the energy consumption into components by operation mode and carried passenger mass. The simulation results emphasize the energy consumption of an intermittent escalator to depend highly on the passenger traffic volume...
The paper deals with adaptive component-based control systems following the Architecture Analysis and Design Language (denoted by AADL). A system is assumed to be a network of software and hardware AADL components that share the control of corresponding physical processes. A component is composed of a set of algorithms encoding the control after any reception of external events and data signals. The...
This paper describes a graphical user interface (GUI) tool designed to support cell design and development of manufacturing processes for an automotive battery application. The GUI is built using the MATLAB environment and is able to load and analyze raw test data as its input. After data processing, a cell model is fitted to the experimental data using system identification techniques. The cell model's...
The main objective of this study is to generate an optimum solution for capacity planning and appointment scheduling issues, which are frequently encountered in clinical flows with various route and treatment periods at dental hospitals. With this study, given the flow of different existing treatment processes belonging to patients are optimized, and also the continuity of the system is ensured by...
This paper presents a novel control scheme for seven levels diode clamped multilevel inverter (DCMLI) topology based shunt hybrid active power filter which can compensate both dynamic reactive power and current harmonics in three phase three wire medium voltage distribution power systems as against many literatures that compensate fixed reactive power. It is on account of this novel control method,...
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