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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...
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...
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...
Widely distributed single-phase power electronic rectifier loads are increasing source of harmonics in power distribution system. These harmonics have many well known adverse impacts on the power system. So it is necessary to improve the power quality of the rectifiers. This paper presents a novel single phase rectifier in which capacitors are used in parallel with diodes in one leg of the rectifier...
Flowering is a key process that determines yield in fruit trees, and a negative relationship between crop load and floral induction has been observed in many species. In apple tree, hormonal signals coming from seeds, which are assumed to be transported within the tree, are suspected to inhibit floral induction. To analyze the intertwined effects of tree architecture, crop load and inhibitory signal...
Topologies with strong invulnerability and high reliability has become an important issue in the development of Wireless Sensor Networks (WSNs). In this paper, WSNs is modeled as a weighted network which the load of nodes is considered as the weight of nodes. Thus, the problem of balancing the load turns into the problem of balancing the weight of the network. A load-aware and energy-aware local world...
Because of some reasons such as machining error and assembly clearance, the loading device will produce kinematic error during movement. While kinematic error will have a great significance on the position accuracy of the loading device. For the above reasons, firstly, the topological structure of the loading device was described based on lower body arrays. The kinematic error matrices of adjacent...
Transmission Expansion Planning (TEP) is an optimization problem that has a non-convex and combinatorial search space so that several solution algorithms may converge to local optima. Therefore, many works have been proposed to solve the TEP problem considering its relaxation or reducing its search space. In any case, relaxation and reduction approaches should not compromise the quality of the final...
Computer planning and simulation of power systems requires system components to be represented mathematically. A method for building a dynamic phasor model of an Interline Dynamic Voltage Restorer (IDVR) is presented, and the resulting model is tested in a simple radial distribution system. Mathematical analysis is carried out for each individual component of the IDVR as modular models, which are...
This paper describes a methodology and an automated process to implement node-breaker capabilities for representing major stations within Con Edison's footprint. This process creates a “hybrid” power flow model of Con Edison's system such that the user-defined stations are represented using the node-breaker model and the rest of the system is modeled using bus-branch representation. The process is...
This paper is to compare the loss of the each 3 level topologies for four-leg voltage converters. In case of the power conditioning system connected to the grid without a transformer, 4 leg topology is essential to cover the unbalanced three phase loads. Using simulations with real loss data table of the power switches, loss analysis of the each 3 level topology with 4 legs according to the different...
The boost inverter presents an interesting topology for solar photovoltaic (PV) applications as a single stage that provides regulated, boosted, and inverted output voltage from a nonlinear dc input. While the boost inverter has been previously addressed from design, implementation, and control perspectives, this paper analyzes its fault modes, failures, and reliability. The inverter is first experimentally...
To achieve software integration and information sharing, the International Electro technical Commission promulgates IEC61970 standard. The standard has created a Common Information Model (CIM). And the Common Information Model (CIM) provides a logical view of the physical aspects of energy management system (EMS) information. With the introduction of CIM model, power system has set off a wave of reform...
Mobile Adhoc Network (MANET) is a collection of mobile nodes with dynamic topology. Such networks are of interest because they do not require any prior investment in fixed infrastructure. Instead, the network nodes agree to relay each other's packets and hence act as routers and automatically form their own cooperative infrastructure. The primary responsibility of a medium access control (MAC) protocol...
The mounting bracket is one of the most important connecting components in commercial vehicle cab. The FEM provides guidance for maximizing the effectiveness of weight reduction efforts on condition that the structure meets the requirements for strength, stiffness and vibration performance. The work presents two kinds of structural optimization methods, which are topology optimization and size optimization...
The key problem of simulating the security events in parallel network is how to partition the simulation duty reasonably to enhance the events simulating performance. This paper improved the pretreatment algorithm of topology partition, analyzed METIS from time complexity and space complexity, and obtained the best partition result. It achieved minimum long-distance routers and maximum time windows...
In this paper, we study the efficiency of inter-domain state advertising in multi-domain networks, in which the intra-domain topology is substituted with a full-mesh topology of abstract links interconnecting the border nodes of the domain. The advertising trigger rate of individual abstract link is taken as the metric of efficiency. We present an analytical model that reveals the contributions of...
HLA-based simulations can experience performance degradation due to communication latencies between simulation federates, which generate significant cumulative overhead. Even though the HLA standard provides mechanisms to decrease the misuse of network resources, it does not present any tool to diminish the communication latencies between interactive federates. Moreover, the interaction dependencies...
Given a large and complex plant to operate, a real-time understanding of the networks and their situational reliability is important to operational decision support. This paper introduces using a unified model to help operators to minimize real-time problems, and also provide a mimic-real time play-back mechanism for system planners on how to upgrade the grid. Real-time simulation architecture is...
This paper presents a novel method of contour reconstruction from dexel data solving the shape anomalies for the complex geometry in virtual sculpting. Grouping and traversing processes are developed to find connectivity between dexels along every two adjacent rays. After traveling through all the rays on one slice, sub-boundaries are connected into full boundaries which are desired contours. The...
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