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This paper proposes a comprehensive approach for the multi-objective design optimization of switched reluctance machines (SRMs). An analytical model that predicts the electromagnetic (EM) behaviors of SRMs with arbitrary geometries, materials or current profiles is first developed and validated by its finite-element analysis (FEA) counterpart in terms of various performance indices. Then, a hybrid...
This paper presents the modeling of variable inductors (VI) following an analytical procedure. Usually, in a VI a dc magnetic flux is injected into the structure in order to provide a bias level that allows for magnetic permeability modulation. The ac magnetic flux is superposed to this dc level, thus making it possible that a variable inductance can be seen from the ac windings. Under the assumption...
A short-circuit fault protection strategy based on the direction of bus-side capacitor discharge current for a high-surety power supply, known as Super Uninterruptable Power Supply (Super UPS), is studied in this paper. It consists of multiple energy sources and storage components. All energy sources and storage components are connected to a common DC bus through converters in the system. If a short-circuit...
This paper analyzes the stator windings turn-to-turn fault tolerant capability on inverter-fed permanent magnet (PM) machines. By adding a secondary neutral point (NP) in stator windings, both the fault detection and tolerant capability can be improved considering a small turn-to-turn short at early stage. From the perspective of fault detection, the proposed two NP's windings increase the equipment...
This paper proposes a scheme to improve the system transient performance by implementing a power command compensation structure in a single phase transformer less photovoltaic inverter with dynamic power decoupling. The drawback of the original control scheme in the transient performance is analyzed and shown in simulation results. The mechanism of the proposed control scheme is discussed in detail...
Increased installation of PV panels in residential areas has resulted in rising incidents of partial shading, where a part of the solar photovoltaic panel is shaded. This not only reduces the output but can also cause deteriorating hot spots on the shaded panels. To understand the phenomenon of partial shading, a detailed model including subcell level behaviour analyses the output of PV panels under...
Power cycling in semiconductor modules contributes to repetitive thermal-mechanical stresses, which in return accumulate as fatigue on the devices, and challenge the lifetime. Typically, lifetime models are expressed in number-of-cycles, within which the device can operate without failures under predefined conditions. In these lifetime models, thermal stresses (e.g., junction temperature variations)...
Due to the continuous demands for highly reliable and cost-effective power conversion, the quantified reliability performances of the power electronics converter are becoming emerging needs. The existing reliability modelling approaches for the power electronics converter mainly focuses on the predictions of lifetime, accumulated damage, constant failure rate or Mean-Time-To-Failure (MTTF), while...
A novel modification of the Z-source circuit breaker topology is presented for low voltage applications. An ultra-fast mechanical switch has been used in place of the solid-state switch (thyristor) in the Z-source circuit breaker to reduce the energy loss utilizing the very low resistance of mechanical contactors. The proposed modification also facilitates bi-directional current flow for distributed...
This paper presents an analytical model of air gapped inductor considering the nonlinear magnetic behavior of the core along with temperature variation. First, a nonlinear magnetic behavior is represented by a mathematical function, which contains three coefficients and defines magnetic flux density (B) as a function of magnetic field strength (H). Using Matlab curve fitting toolbox, these coefficients...
With the widespread use of internet in the age of information, there has been a continuous growth of social networking which enables people to share breaking news and document personal ideas. Such a significant stream of data enables scientist to conduct research that provides an insight into online social discussions. Aim of this study is to investigate the possibility of summarizing and prioritizing...
In this paper, computer engineering education in Turkey were examined on different perspectives. The current model of engineering education was analysed, and then some suggestions were presented. Also, some curriculum changes were suggested to increase the quality of education on undergraduate and graduate educations basis. To be able to have well qualified computer engineers, some methods which can...
Inverters are widely applied in industrial fields. To acquire the analytical solution of sinusoidal pulse width modulation (SPWM) Single-phase inverters, a traditional harmonic balance based method is extended, in which the double Fourier transform is used to describe the nonlinear switching function of the converter. Thus the steady-state periodic solution of the inverter can be obtained by our approach...
With the rapid development of the business and the continuous improvement of the level in SGCC, the security research in the mobile field has been paid more and more attention. Although mobile work terminals can improve the efficiency of field operations, but a large number of mobile terminal access, leading to the terminal management difficult to increase, security has been greatly challenged. Therefore,...
Common modeling in interdisciplinary contexts, such as innovation management, is a challenge, given that different disciplines often do not fully understand each other's models and paradigms. Building on the work of an interdisciplinary research collaboration, we explore, in which way interdisciplinary modeling can enrich innovation management. We show that models can be described on a general level...
This paper proposes the design of an adaptive e- learning system with gamification elements. In the context of the increasing need to keep learners motivated among so many distractions, our project aims to help a user acquire knowledge at his own pace, in a captivating environment and as flexible as possible. To achieve that the solution focuses on the course model, adaptive questions and a reward...
For complying with power distributor regulation, the electric car chargers have to address the line current harmonic mitigation problem. The conventional solution is a proportional integral controller on the rectified current with a feed-forward anticipation action on the input network current. In this work we take advantage of a harmonic description of the electric car charger in order to propose...
As doubly fed induction generator (DFIG) based wind turbines (WTs) have already become a kind of significant generators in modern power systems, a reliable parameters design method for an excellent dynamic performance in rotor current control is a basic requirement for outer control loops design and system analysis. Due to the amplitude characteristic is neglected in conventional frequency domain...
Electrical energy generation is evolving from centralized towards distributed energy resources (DER) like wind and solar power plants. In such power systems, new challenges arise for the design of voltage source converter (VSC) control strategies. In the last few years synchronverters have gained interest from the research community due to their capability of emulating synchronous machines (SMs) and...
Multi-phase magnetically coupled resonant (MCR) wireless power transfer (WPT) technology, which can effectively reduce the limits of coils spatial locations on power transfer, has become one of the most promising technologies in the mid-range applications. In this paper, a three-phase MCR WPT system was investigated and the equivalent circuit model was built and simplified. Based on the theoretical...
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