OALib Journal期刊

ISSN: 2333-9721




2019 ( 85 )

2018 ( 706 )

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匹配条件: “Power Builder” ,找到相关结果约105734条。
Implementing of Reports in Circulate Subsystem of ASNLIS Using Power Builder
Power Builder实现ASNLIS中的流通统计报表设计

Fu Honghu,

现代图书情报技术 , 2000,
Abstract: This article introduced the background of the study and design of ASNLIS and the developing tool—Power Builder. The design and implementing of the reports in circulation are also discussed.
International Journal on Computer Science and Engineering , 2012,
Abstract: Database Management systems are widely used on industries to administer databases like MySQL. The most common way of managing these databases is via long commands or scripts that need to be entered on a console. In some cases, these commands can be long enough to span 4 lines. The longer the command, higher is thechance of making mistakes. They require the administrator to be highly skilled. In this paper, a Query Builder is proposed and this will be accessible from anywhere in the world. If we compare conventional DB administration procedures and administration using our Web Based Query Builder, we can see that it highly simplifies the task of administration.
基于ArcGIS Model Builder的地形指数提取方法及实践研究
The Study on Terrain Index Extraction Method and Practice Based on ArcGIS Model Builder

肖燕, 解鹏
Geomatics Science and Technology (GST) , 2013, DOI: 10.12677/GST.2013.13003
流域地形指数水文模型TOPMODEL已被应用于陆面模式(Land surface Models, LSMs)以改进陆面模式对水文过程的模拟。地形指数(ln(α/tanβ))是TOPMODEL的核心,是进行水文分析的重要指标。因此,高效的提取地形指数信息非常重要。本文将淮河流域作为案例区,以地形指数单流向算法为理论基础,利用ArcGIS9的Model Builder建模工具,建立地形指数提取模型。在模型设计过程中充分考虑到汇流面积、坡度等参数的有效性,使模型具有较高的通用性。使用者启动模型加载数据即可简单又快速地获得地形指数分布数据。
River terrain index TOPMODEL hydrological model has been applied to Land surface model (Land surface Models, LSMs), to improve Land surface of hydrological process simulation model. The core of TOPMODEL is terrain index (ln(α/tanβ)). And it is an important index on the hydrologic analysis. Therefore, effective extracting terrain index information is very important. In this paper, the huaihe river basin as a case area, the terrain index extraction process model is build, using the ArcGIS9 Model Builder tools. This model is based on a single flow algorithm for calculating process. Model has higher versatility, because of fully considering the effectiveness of the parameters such as the slope and the flow accumulation in the model design process. Using this model can be very simple and quick to get terrain exponential distribution data of terrain index.
Power Distribution Strategy Considering Active Power Loss for DFIGs Wind Farm  [PDF]
Xiao Du, Yigong Zhang, Zhiqiang Dai, Huan Liu, Siming Wei, Jin Liu
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24030
Abstract: With the development of concentrated wind power areas, new energy’s dispatching problems are more prominent with its fast expansion. However, we can maximize the utilization of wind power under power curtailment conditions by optimal wind power dispatching. The paper studies on the basic theories of wind power turbines, and analyses the power’s control and output characteristics of wind turbine, which analyses the double-fed inductor generator’s excellent decoupling control of power and its excellent reactive power output capability. By studying the characteristics of wind power output, this paper provides a strategy for optimal dispatch in wind power generation. The calculation results show that the total active and reactive power output of the wind farm match the request of dispatch center. And the total active loss and total reactive loss is the least in the meantime.
Stability Analysis on Power System with Large Power Source  [PDF]
Huabo Shi, Xiaoyan Zhou
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B099

In this paper, the stability problems of power systems with large power source are analyzed with viewpoint of energy balance. The phenomena are studied when the energy delivery are “blocked” by faults that occur on some key transmission lines of a large power source within a power system, on the transmission lines between the interconnected power systems, or on some key buses. The cases are based on a practical power system and its interconnected systems.

The Optimal Power Flow Calculation of Power System Based on the Annealing Algorithm  [PDF]
Xiaodong Yu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B153

The result of OPF whose task is to compute the voltage and angle of each node in power system is the basic of stability calculation and failure analysis in power system. For this goal, the idea of simulated annealing method is introduced, mixed with the greedy randomized algorithm (GRASP), and then the hybrid SA algorithm is obtained. The algorithm is applied to the multi-objective optimal power flow calculation of power system, and the effectiveness of the algorithm given in this paper is verified by analysis of examples.

Analysis on the Characteristics of Wind Power Output in Hainan Power Grid  [PDF]
Jianfeng Wang, Dongmei Zhao
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B076
Abstract: It is of great importance to study the characteristics of wind power output for the healthy and secure & stable of power grid. Based on the actual operating data, the probability distribution of the power fluctuations of the wind farm in Hainanand the variation of wind power annual, seasonal, daily active output is analyzed. The study showed thatHainanProvincehas obvious seasonal variation of wind power output characteristics, higher levels of output of the year generally in winter or summer, spring and autumn to contribute small. The average wind power output will contribute to “low day and high night”, with certain peaking capacity. Shorter time scales, changes in the wind power to smaller amount, not to bring too much impact on system operation, while a long time fluctuations affect the scheduling and running on the grid.
Virtualization of functioning Ethernet device for operation of power load by existing IP networks
Aksenov Vladislav Yurevich
Vestnik Astrahanskogo Gosudarstvennogo Tehni?eskogo Universiteta. Seria: Upravlenie, Vy?islitel?naa Tehnika i Informatika , 2010,
Abstract: The way of creation of real behavior of virtual Ethernet device for opera-tion of power load by IP networks, using software products LabView and Builder C ++ is considered. As a virtual Ethernet device IP-dimmer is presented, which operates five active loads of 220 volt. The power part of the device is fulfilled on the simistors the operation of which is carried out by the microcontroller. The virtual device and the program of its operation contain network UDP-socket component – the main interface between the device (server) and program support (client). For visual mapping of the state of the virtual device work the voltmeters, the indicator of power change on loads and the window of IP-packages reception are entered in addition. The program part of the client and the server has the unit of time saving of all transferring and accepting commands accordingly. Thus, there is a possibility not only to observe the functioning of the virtual device, but also to spend a calculus of its operation.
To Realize Connecting to Database by Reading and Writing Register Table and INI File in PB

计算机系统应用 , 2002,
Abstract: 本文介绍了注册表和INI文件结构,分析了应用PB对注册表和INI文件进行读写实现数据库连接的基本方法.
Design and Application of Wind Power Peak Control Technology  [PDF]
Songyi Zhu, Xinhua Deng, Shuguang Meng, Fuqiang Tang
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.29004

Wind power control technology is an important part of intelligent control in wind farms. By the automatic calculation and implementation of control strategy, problems such as imprecise of manual control scheduling, slow adjust rate, heavy workload, etc. have been solved. It can improve the capacity of wind power grid, and it also has the important meaning to the safe and stable operation of power grid. This paper introduces wind power control system from certain aspects such as control mode, control principle, and so on.


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