Modern distribution networks are large-scale, structurally complex and interconnected, a comprehensive distribution automation system is required to monitor, manage and protect the distribution network. This paper foc...
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The probable route sets in the network diagram were calculated by adjacency matrix method, and based on the assumption that activity becoming the key obeyed 0-1 distribution, a probable route matrix was established. A...
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ISBN:
(纸本)9783037858578
The probable route sets in the network diagram were calculated by adjacency matrix method, and based on the assumption that activity becoming the key obeyed 0-1 distribution, a probable route matrix was established. A random variable matrix was structed by monte carlo simulation under condition of activity time independent distribution. A matrix algorithm model was built by isolating activity time's impact on activity becoming the key for the first time. This model with a simple and optimal algorithm avoided the computation complexity of network planning time parameter, to evaluate project duration risk rapidly and statistical analyze the probability of activity becoming the key and the influence degree of activity time fluctuation impacting on project duration, providing theoretical and data support for decisions. Empirical research on a tunnel engineering project verified its practicability and feasibility, providing a new powerful tool for assessing project duration risk in the network diagram quickly.
With the increasing penetration of distributed power sources, the fault location of distribution networks after short-circuit faults becomes more complicated. Therefore, it is of great significance to study the fault ...
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ISBN:
(数字)9781728152813
ISBN:
(纸本)9781728152813
With the increasing penetration of distributed power sources, the fault location of distribution networks after short-circuit faults becomes more complicated. Therefore, it is of great significance to study the fault location methods after the access of distributed power sources. This paper proposes a new fault location algorithm for distribution networks based on the abrupt current direction. The fault location is determined based on the abrupt direction of the short circuit current and the magnitude of the short circuit current. The matrix algorithm is used to locate the fault, and direction of the short circuit current of detection terminal in the network is taken as the research object. Based on the directivity of the distribution network, the continuity and directivity of the fault overcurrent are combined to determine the fault location.
This paper presents the design of a processor for the computation of 8x8 two dimensional Discrete Cosine Transform (2D-DCT) in analog domain. In the implementation, current mode modules are used. Suitable architecture...
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ISBN:
(纸本)9781728118956
This paper presents the design of a processor for the computation of 8x8 two dimensional Discrete Cosine Transform (2D-DCT) in analog domain. In the implementation, current mode modules are used. Suitable architectures for analog implementation with optimal power and hardware usage have been selected for the implementation of the DCT processor design. A digital design of the DCT processor using components such as flip flops, multiplexers which are inferred from the hardware description in behavioral model is done for performance comparison. The analog design is found to be suitable for power-constrained applications whereas digital design is suitable for accuracy-specific applications.
Distribution network is the closest power supply service terminal in power system to power customers,and its construction level has a great impact on the quality of power supply *** research of fault location in distr...
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Distribution network is the closest power supply service terminal in power system to power customers,and its construction level has a great impact on the quality of power supply *** research of fault location in distribution network can improve the self-healing level of distribution network,help to quickly find fault segments and isolate them,and realize the restoration of power supply in fault *** this paper,a fast fault location method without RTU information is proposed for the non-measurement and control area of distribution *** on the coordinate information provided by the hotline telephone,other fault nodes are searched from the base point to both sides by using the dynamic hierarchical method of power network,and then all the equipment in the whole dispatching area is *** different fault membership functions of all devices are *** synthesizing the information of several hotlines,the comprehensive membership degree of each switch element is *** the comprehensive membership degree of a component is greater than the preset threshold,the fast fault location can be *** simulation results show that the algorithm is feasible and effective.
Based on the analysis of the LiNbO3 Mach-Zehnder interferometer (MZI), a MZI with three optical switch functions (direct connection, cross connection and multicast connection) is demonstrated in this paper. With this ...
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Based on the analysis of the LiNbO3 Mach-Zehnder interferometer (MZI), a MZI with three optical switch functions (direct connection, cross connection and multicast connection) is demonstrated in this paper. With this MZI, a 4 x 4 optical switch is then proposed. The optical switch not only switches optical signal from one channel to another (1:1), but also from one channel to several channels (1: k) with non-blocking and duplex communication. Later, a matrix analysis on the optical switch proposed is given. In the end of this paper, an example of the transmission path and the controlling state of the optical switch is demonstrated. (C) 2017 Elsevier GmbH. All rights reserved.
Island-capable microgrids can potentially enhance the efficiency of distributed generations. In general, protection schemes in traditional distribution network cannot meet the requirements of microgrid internal protec...
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Island-capable microgrids can potentially enhance the efficiency of distributed generations. In general, protection schemes in traditional distribution network cannot meet the requirements of microgrid internal protection. In order to solve the problem, this paper proposes the positive-sequence fault component of current as the starting criterion. And a graph model describing the overall structure of a microgrid is established. The information about fault currents, including amplitude and direction, is acquired to locate fault branch. Furthermore, a new matrix algorithm is used to locate the fault point, so that the fault can be isolated. Finally, a microgrid model is simulated in the PSCAD/EMTDC software environment to illustrate the validity of fault location principle in microgrid protection. (c) 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
The least squares problems have wide applications in inverse Sturm-Liouville problem, particle physics and geology, inverse problems of vibration theory, control theory, digital image and signal processing. In this pa...
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The least squares problems have wide applications in inverse Sturm-Liouville problem, particle physics and geology, inverse problems of vibration theory, control theory, digital image and signal processing. In this paper, we discuss the solution of the operator least squares problem. By extending the conjugate gradient least squares method, we propose an efficient matrix algorithm for solving the operator least squares problem. The matrix algorithm can find the solution of the problem within a finite number of iterations in the absence of round-off errors. Some numerical examples are given to illustrate the effectiveness of the matrix algorithm.
The problem of integer balancing of a three-dimensional matrix with constraints of the second type is studied. The elements of the inner part (all three indices are greater than zero) of the three-dimensional matrix a...
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The problem of integer balancing of a three-dimensional matrix with constraints of the second type is studied. The elements of the inner part (all three indices are greater than zero) of the three-dimensional matrix are summed in each direction and each section of the matrix;the total sum is also found. These sums are placed into the elements where one or more indices are equal to zero (according to the summing directions). The problem is to find an integer matrix of the same structure, which can be produced from the initial one by replacing the elements of the inner part with the largest previous or the smallest following integer. At the same time, variations of the sums of elements from those in the initial matrix should be less than 2 and an element with three zero indices should be produced with standard rounding-off rules. Heuristic algorithms for this problem are suggested: layering algorithm obtained as a generalization of a similar algorithm for the problem with constraints of the first type and a new matrix algorithm. The latter consists of three parts: search for the basic matrix, search for the maximum matrix, and matrix correction. Each of them is a cyclic change of the integer matrix using from one to three elements from the inner part. A modification of the matrix algorithm is suggested. The algorithm is directed to more uniform filling of the inner part of the integer matrix. Also, the complexity of all three algorithms is estimated. The comparative analysis of matrix algorithms based on the results of computing experiments is adduced.
During the last decade, Model Checking has proven its efficacy and power in circuit design, network protocol analysis and bug hunting. Recent research on automatic verification has shown that no single model-checking ...
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During the last decade, Model Checking has proven its efficacy and power in circuit design, network protocol analysis and bug hunting. Recent research on automatic verification has shown that no single model-checking technique has the edge over all others in all application areas. So, it is very difficult to determine which technique is the most suitable for a given model. It is thus sensible to apply different techniques to the same model. However, this is a very tedious and time-consuming task, for each algorithm uses its own description language. Applying Model Checking in software design and verification has been proved very difficult. Software architectures （SA） are engineering artifacts that provide high-level and abstract descriptions of complex software systems. In this paper a Direct Model Checking （DMC） method based on Kripke Structure and matrix algorithm is provided. Combined and integrated with domain specific software architecture description languages （ADLs）, DMC can be used for computing consistency and other critical properties.
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