地理信息系统网络应用电力系统毕业论文中英文资料对照外文翻译文献综述

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 and wind parks reduce the cost per KWh.

3. CREATION OF GIS

The 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 Access 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 substation 2. Number of busses 3. Type of the substation 4. Transformer data 5. Capacitor banks 6. Load Demand data

For the transmission lines the elements that were imported in the database and can be viewed on the map are: 1. Circuit type 2. Circuit length

3. electrical data such as R,X,B 4. 1st,2nd and 3rd loading limits

For the renewable sources and the power plants the elements that were imported in the database were: 1. location

2. Installed Power 3. Electrical data

After 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 programs. One simple program which presents system?s data is cmd01(fig.9). It has been developed by EPSL using ESRI?s 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 PART

On 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 Server 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 maps 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 different 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 design. 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 deployed 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 animation 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 were 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 ANALYSIS

The Last part of the project is the creation a Load Flow Analysis of the network where the user can interact with 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 able 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 elements (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. CONCLUSIONS

GIS applications are very helpful in displaying a variety of data for power systems? characteristics 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 model 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 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. ACKNOWLEDGEMENTS

This work is a part 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