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The ease of expansion of power system and lowered cost made the use of modular converters in Renewable Energy System more common. Different configurations are implemented depending on the applications. Control strategies like fuzzy logic, droop method and charge control scheme are developed for achieving sharing of current and voltages among the converters. In this paper new modularization architecture...
Modular Multilevel Converter (MMC) has great application prospects for the flexible HVDC transmission, high-power motor drive and so on. In this paper, a discrete-time model of the MMC based on the virtual ergodic method is proposed for the typical MMC topology. First, the MMC topology is analyzed and its continuous-time model is established. Then, the state equation in the continuous-time model is...
This paper addresses the generation of stochastic models for dependability and performability analysis of complex systems, through automatic replication of template models. The proposed solution is tailored to systems composed by large populations of similar non-anonymous components, interconnected with each other according to a variety of topologies. A new efficient replication technique is presented...
With the development of electric locomotives in the direction of high speed and heavy load, the problems of negative sequence current and excessive neutral section in traction network have become more serious than before. Thus, a hybrid railway power conditioner (H-RPC) is proposed for co-phase power supply system to solve these problems. In this paper, the topology and compensation principle of the...
Research on critical infrastructures (CI)s deals with sensitive data that demands underlying platform to be secure, in addition, testing of CI resilience strategies requires reproducibility of results. Disruption or natural disaster scenarios can not be tested on the physical systems, thus simulations are used for experimentation on CIs and as they are inherently distributed and interdependent which...
An innovative Y-shape power divider (PWD) model is established based on the Kron-Branin formalism. The equivalent topology of Y-PWD is elaborated by considering the constituting elements of classical transmission line (TL). The S-parameter theoretical model is applied to single-input two-output (1:2) unequal Y-PWD. The unequal level of the outputs is controlled with output quarter wavelength branch...
This paper describes selected issues concerning realization of energy storage system (ESS) designed to operate in power distribution system. This paper presents a modular approach of 300 kVA power converter operating with superconducting magnetic energy storage (SMES), which gives high dynamics together with high power and suitable capability for instantaneous energy storage. Analysis and simulation...
This paper presents a comparative study on two analytical modelling techniques (i.e. Fourier analysis and Tooth Contour Method), applied to a benchmark topology of a linear permanent magnet synchronous motor (LPMSM). The investigated methods are used for obtaining the thrust force of a LPMSM with significantly reduced computation time (from the order of seconds to the order of milliseconds), compared...
Complex networks have become a large area of study due to their pervasiveness in today's society and our dependence on them. While network science enables engineers and scientists to improve resilience of networks, due to lack of realistic data, simplistic assumptions may result in incorrect conclusions. Network service providers optimize their designs and plan for future capacities based on realistic...
Current methods of topology estimation rely on breaker statuses to obtain accurate results. However, due to the lack of availability of time stamped breaker status data in many electric systems, as well as the errors associated with this data, these methods are very limited in their current scope. Additionally, synchrophasor measurements can be used to supplement information on the connectivity between...
The purpose of this paper is to investigate the flux leakage effects in the transverse-flux magnetic gear (MG), in which two typical flux leakage phenomena are identified and analyzed, namely, end leakage and fringing leakage. By using the JMAG 12.1 software, the three-dimensional finite element analysis (3D-FEA) modeling surrounded by some blocks with setting as different material properties are...
When power grid voltage sag occurs simultaneously with some other power quality problems, it will be necessary to install a variety of power quality conditioners. In order to effectively analyze potential interaction resulted from combined operation of the series and shunt compensation devices with no common dc bus. This paper has deeply derived the impedance models of DVR and DSTATCOM, then illustrates...
With the increase of the operation speed and the miniaturization, the power consumption assessment of multilayer printed circuit board (PCB) becomes a crucial task during the design phase. More accurate power integrity (PI) analysis is necessary for the complex multilayer PCB. An unfamiliar modelling of static and dynamic power distributed through a four-layer interconnect structure is introduced...
This paper compares the characteristics of serial, parallel and LCC compensation topologies of secondary-side in wireless powering systems with a constant-current primary-side. The topologies characteristics of power, efficiency and load are carefully analyzed and detailed presented. And the correctness of theoretical analysis is verified by simulations. This study results can guide the selection...
In this paper, we investigate the effect of scale-free structure of a network topology on performance of CCN (Content-Centric Networking). Specifically, we generate multiple scale-free and non-scale-free network topologies by two synthetic network generation models (i.e., scale-free tree and generalized BA model). We compare the average delivery delay and throughput of CCN with scale-free and non-scale-free...
Next-generation power networks will contain large numbers of grid-connected inverters satisfying a significant fraction of system load. Since each inverter model has a relatively large number of dynamic states, it is impractical to analyze complex system models where the full dynamics of each inverter are retained. To address this challenge, we derive a reduced-order structure-preserving model for...
In the opportunistic network with social attributes, message forwarding based on social relations often has good communication efficiency. The existing opportunistic network routing algorithms are based on the static social relations. But in practical application scenarios, the moving nodes make the network social relations dynamic evolution with time, so the social relation of the opportunistic network...
Recently, the need for efficient representations of data conveyed by graphical structures has emerged in many different contexts. While compressing such data one must consider two types of information. The first type is the information carried by the labels embedded in the structure. The second type is the information conveyed by the structure itself. In this extended abstract we address the latter...
Physical topology design of optical networks is a NP-hard problem and is frequently accomplished by using heuristics and metaheuristics. Previous works investigated the suitability of a tunable version of the Gabriel method to represent optical networks regarding performance and cost. In this paper, we study the robustness of a heuristics based on Gabriel graphs deployed in three different backbone...
This paper focuses on the optimization of a fixed-topology MEMS accelerometer sensor using the MOEA/D evolutionary algorithm. Several methodologies have been implemented for the optimization of MEMS sensors. These techniques are either based on sweeping several design parameters to achieve a good performance or focused on the sensitivity analysis to determine the effects of each design parameter in...
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