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1、精选优质文档-倾情为你奉上附录一：英文原文A GIS WEB APPLICATION FOR POWER SYSTEM OF CRETEJ. Syllignakis, C. Adamakis, T.M. PapazoglouThe Technological Educational Institute of Crete (TEIC), GreeceABSTRACTGeographical Information System (GIS) applications are very helpful tools for displaying and analyzing informationfor
2、 several technological fields. The research group of Electrical Power System Lab (EPSL) of TEIC is developing aGIS software application for displaying the operational conditions of the power system of Crete, presenting alsocritical information and statistical data for systems characteristics. This t
3、ool is intended to help training of engineersin the Electrical Department of TEIC to simulate and visualize power system operation and characteristics. Besides,this tool is very helpful for a power system engineer in observing the whole system operations and systems data. Alldata used are derived fr
4、om a database developed by EPSL. Digitalized maps of Crete Island use this database anddisplay them optionally according to users demand or choice. So, an authorized user can decide which data will bedisplayed on the map, and with a simple mouse click on a selected element of the map he can b inform
5、ed about its characteristics. Furthermore, this application is being uploaded on web. This means that this application runson aserver of EPSL, which can serve distant users after authorization procedure. That distance user could be a trainee inhis desk, or an engineer, or a researcher in the lab. On
6、e of the services that application provides is the load flow calculation on a specific part of the system, or for a specific scenario of systems operation.Key-Words:- GIS applications, Power Systems observation, power systems web-applications1. INTRODUCTIONCretes electrical power system is a large a
7、utonomous system with large wind power penetration. The customers power & energy demand is increasing with high rates. The operation of the whole system is in charge of the Greek PPC (public power corporation)control center, located in Iraklion, where a SCADA system has been installed. In terms of i
8、ntegration of dispersed generation new methods and computer applications are adopted toward adaptation of the critical information of systems operational conditions.Mapping and Geographic Information Systems (GIS)are key to a utilitys business. These software applications store and map a vast amount
9、 of information about the utilitys electric system and other outside plants. People and applications across theorganization typically require information from the GIS.The benefits of adaptation of a GIS for a power system are many. Descriptive presentation of data (graphics,maps, tables etc) and pre
10、sentation of data in real space are offered. They offer, also,convenience concerning data processing since, as wellas to examine them in different layers. It analyzes and presents information related to spatial places. It can combine elements data from digital database, GPS for concerning the specif
11、ic definition of places,sampling and distant measurements. The relation between the data basis and the maps give the chance to the user to interact with the system of an interactivecommunication between the user and the system.Moreover many data basis can be connected andcombined improving the flexi
12、bility of the system.Using specific tools of software design (like map objects) we can display the results of a load flow test on the digital map of Crete.Its possible to use GIS to define the number of people as well as forecast of load demand. Further more if we know the density (people, space) we
13、 can rate the placesper load demand.The amount of data can be presented on maps for a quick estimation of the network-system operational condition.The GIS can observe external factors such as weather conditions. For example if we know the temperature of an area, were able to predict the load demand
14、there,for the next hours.GIS is a helpful tool for new types of energymanagement.2. SYSTEM MODELLING TECHNICAL INFORMATION2.1 Power ProductionThe power system of the island of Crete is the largest autonomous power system in Greece with the highest rate of increase nation-wide in energy and power dem
15、and. The conventional generation system consists of three major power plants one in Linoperamata, one in Chania and one in Atherinolakos (the latest). The first two power plants are located near the major load points of the island. There are 20 thermal, oil-fired generating units with a total instal
16、led capacity of about 742MW. The percentage of the participation of each generator type in the total electrical power production and the annual fuel consumption are depicted in figures1 and 2(These two figures correspond to the system in 2001, before atherinolakos installation.The power system compr
17、ises the following power stations: Six steam turbines in Linoperamata Four diesel engines in Linoperamata Four gas turbines in Linoperamata & five gas turbines in Chania. One combined cycle in Chania of 133.4 MW (2gas turbines and 1 steam turbine) Two diesel engines in Atherinolakos2.2 Load demandTh
18、e base load is mainly supplied by the steam and diesel units. The gas turbines normally supply the daily peak load. Until 1988 the annual peak load demand always occurred in winter, from then on it always appears in summer evenings. Figure 3 shows the increase of energy demand and peak load since 19
19、64.One characteristic of the load profile is the large variations (low night valleys high evening peaks).Gas turbines have a high operating cost that increases significantly the average cost of electricity being supplied.2.3 Transmission systemThe transmission network (figure 4) consists mainly of 1
20、50 kV lines. There are only 2 lines of 66kV from Linop33 (production sub) to 1Irak31 (substation). The distribution network consists of 20 kV (21 kV) and 15kV (15.75 kV) lines. The generation system and the transmission network are supervised by a control center located in one of the substations in
21、Iraklio (2IRAK), using a SCADA system.2.4 Wind ParksAbout 15 Wind Parks(WPs) have been installed in Crete since 1995 of total capacity of up to 134.7 MW and there are plans for more WPs in the next years. The peak wind penetration was up to 41.2%. Most of the wind parks have been installed at the ea
22、stern part of the island (Sitia) that presents the most favourable wind conditions. As a result, in case of faults on some particular lines, the majority of the wind parks will be disconnected.Furthermore, the protections of the WPs might be activated in case of frequency variations, decreasing addi
23、tionally the dynamic stability of the system.Extensive transient analysis studies have therefore been conducted in order to assess the dynamic behaviour of the system under various disturbances and with different combinations of the generating units.2.5 Technical constraintsThe start up preparation
24、time of a generator depends on its type. The gas turbines require 6-12 minutes for preparation. The steam turbines require 1-2 hours in hot state, and 8 or more hours for the cold state. The diesels require about 20 minutes. In addition, the increase rate of power of each generator also depends on i
25、ts type. For the steam turbines is low. For the gas turbines it is 16-17 MW/min. Diesel s rate is also high, as they react rapidly to load variations. In order to avoid undesirable frequency increase, the generator is at its technical minimum when it is connected to the system.One of the biggest pro
26、blems of the system is the high fuel cost. Gas turbines consume diesel oil which is expensive and increases the energy cost per KWh. Steam turbines and diesel engines consume crude oil. (diesel engines consume diesel oil only at the start up state and the stop state) Diesel engines, steam turbines a
27、nd wind parks reduce the cost per KWh.3. CREATION OF GISThe first part of this project was the creation of GIS maps that represent the Electrical Power System of Crete. For this reason we created a Geographical Information System (GIS) using ArcGIS and Microsoft Access. Using ArcGIS and Microsoft Ac
28、cess we represented substations, transmission lines, renewable sources, power plants of Crete presented over a digitized map.For every substation the elements that were imported in the database and can be viewed on the map are:1. Name of the substation2. Number of busses3. Type of the substation4. T
29、ransformer data5. Capacitor banks6. Load Demand dataFor the transmission lines the elements that were imported in the database and can be viewed on the map are:1. Circuit type2. Circuit length3. electrical data such as R,X,B4. 1st,2nd and 3rd loading limitsFor the renewable sources and the power pla
30、nts the elements that were imported in the database were:1. location2. Installed Power3. Electrical dataAfter the completion of the first part of the project, the result was the creation of digitalized maps of Crete where the user can work with, using programs such as ArcGIS or other similar program
31、s. One simple program which presents systems data is cmd01(fig.9). It has been developed by EPSL using ESRIs map objects. The user chooses the layers (data) he wants to be displayed on the map of Crete. He can also zoom in or zoom out in order to observe the desired area of the network.4. WEB PARTOn
32、 the second part of this project our aim was to transform the digitized maps that were created with the use of ARCGIS in a format that can be viewed in Web. For this reason we used technologies such as Apache, MySQl and SVG (Scalable Vector Graphics).We developed a Web server on a Linux SuSe 10.0 Se
33、rver where Apache Web Server was installed. The second step was to import the database that was analyzed in step 1 from windows access to MySQL. The choice for MySQL was based on the fact that is a database capable to work on Web environment(figure11).The third step was the transformation of GIS map
34、s in a format that can be viewed in Web explorers. Our choice was by default SVG. SVG is a platform for twodimensional graphics. It has two parts: an XML-based file format and a programming API for graphical applications. Key features include shapes, text and embedded raster graphics, with many diff
35、erent painting styles. It supports scripting through languages such as ECMAScript and has comprehensive support for animation.SVG is used in many business areas including Web graphics, animation, user interfaces, graphics interchange, print and hardcopy output, mobile applications and high-quality d
36、esign. SVG is a royalty-free vendor-neutral open standard developed under the W3C Process. It has strong industry support; Authors of the SVG specification include Adobe, Agfa, Apple, Canon, Corel, Ericsson, HP, IBM, Kodak, Macromedia, Microsoft, Nokia, Sharp and Sun Microsystems. SVG viewers are de
37、ployed to over 100 million desktops, and there is a broad range of support in many authoring tools. SVG builds upon many other successful standards such as XML (SVG graphics are text-based and thus easy to create), JPEG and PNG for image formats, DOM for scripting and interactivity, SMIL for animati
38、on and CSS for styling. SVG is interoperable. The W3C release a test suite and implementation results to ensure conformance. The tool that was used to transform the GIS maps to SVG format was the MapViewSVG from UisMedia. The result was the creation of digitized maps of the Power System of Crete wer
39、e a user using a Web explorer such as IE of Firefox can interact with the map and decide which parts of the Power System to be shown (Power Plants, substations etc).5. LOAD FLOW ANALYSISThe Last part of the project is the creation a Load Flow Analysis of the network where the user can interact with
40、the SVG map and perform a Load flow Analysis of the power system of Crete. This application is under construction and it will be accomplished till May 2007. The Gauss-Seidel Algorithm is used and it has been performed on a simplified 9-buses model of the network. An authorized distant user will be a
41、ble to input in a appropriate form the load demand (P(MW) and Q(MVar) data for the 9 specific high voltage buses (High Voltage/Low Voltage Substations) and generators production. The server will execute the Gauss-Seidel load flow calculations. Results will be displayed on web, on the specific elemen
42、ts (substations) of the map of Crete. The realization of the algorithm is going to be、constructed using PHP and Jscript that will use the data elements of the Mysql database described above.6. CONCLUSIONSGIS applications are very helpful in displaying a variety of data for power systems characterist
43、ics and operation. EPSL has developed a database and a GIS tool for the power system of Crete. This work has been uploaded on web. Students of Electrical Department of TEI of Crete can be training on power systems operation and can observe systems electrical characteristics. There is a complete mode
44、l of a real autonomous power system on web, featuring all related data such as transmission lines, generators, capacitors etc. Besides an authorized user can apply changes to the model in case of changes of the power system (for example new capacitors, transmission lines, substationsetc). The above
45、mentioned system will be capable to support load flow analysis based on real data of the Crete Power System. For the end-user (for example a student) there will be the capability to accomplish that Load Flow Analysis without the need to use specialized software.7. ACKNOWLEDGEMENTSThis work is a part
46、 of a project which is co-funded by the European Social Fund and Greek National Resources, “EPEAEK II ARXIMIDES”.中文译文地理信息系统网络应用电力系统克里特岛j.syllignakis,adamakis, 技术备忘录papazoglou技术教育学院的克里特岛（teic）,希腊摘要地理信息系统（ GIS ）的应用是非常有用的工具，可以展示和分析几个技术领域的信息。电力系统实验室（ epsl ） teic研究小组，是发展地理信息系统软件应用，显示克里特岛的电力系统运行条件的，介绍also
47、critical的资料和统计数据是系统的特点。这个工具是为了帮助培训engineersin电子部teic，模拟并可视化电力系统运行和特点。此外，对于一个电力系统工程师在观察整个系统的运作和系统的数据，这个工具是非常有帮助的。所有的数据使用的是来自一个数据库开发的epsl 。克里特岛的数字化地图使用这一数据库，并且他们根据用户的需求来选择。因此，授权的用户可以决定哪些数据将被在地图上显示，甚至一个简单的点击鼠标在地图上选定的元素，就可以告知其特色。此外，这项申请正在上传于网页。这意味着，这个应用程序运行时就是一个epsl的服务，它可以服务于授权程序后的遥远用户，距离用户在他的桌面上可以是一个教练
48、员，或实验室里的工程师、研究员。其中一个服务提供的应用是就某个特定系统的一部分的潮流计算，或为某一特定情况下的系统的运作。关键词：地理信息系统应用 电力系统观察 电力系统网络应用1概述克里特岛的电力系统是一个大型自动化系统，贯穿于大型风力发电。客户的电力和能源需求是高速增长的。整个系统的运行负责设在设在iraklion的希腊的PPC （公共电力公司）控制中心，在那里一个供电SCADA系统已经安装。在条款一体化的分散发电的新方法和计算机应用是通过对法律适应化的关键信息系统的运行条件。制图和地理信息系统（ GIS ）的关键是实用的业务。这些应用软件和地图存储了大量的有关公用事业的电力系统和其他以外
49、植物的资料，。人们和应用的资料通过整个组织从地理信息系统中获得。适应一个地理信息系统的电力系统的好处很多。描述介绍资料（图形，地图，资料表等）和演示文稿的数据在真实空间的提供。此外，他们提供方便有关的数据处理以来，以及研究他们在不同的层次的数据分析，并提出了相关的信息空间的地方。它可以结合的要素-数据，从数字数据库，全球定位系统有关的具体定义的地方，取样和遥远的测量。基础数据和地图之间的关系提供机会，向用户进行互动的制度，一个互动的沟通，用户和系统。此外，在许多数据的基础上可以连接和联合，提高该系统的灵活性，。使用特定的工具软件设计（如地图对象） ，我们可以显示关于克里特岛负载流试验对数字地图的结果。它可以使用地理信息系统定义有多少人，以及预测的负荷需求。此外，如果我们知道密度（人，空间） ，我们可以得到该地方每负荷的需求比率。数据量可以在地图上介绍了一种快速估计网络系统的运行条件。地理信息系统可