| The urban power system with the character of high dense load, large quantity of load, and high level of reliability and power quality requirement, is an important part of the electrical power system, and also a major load center. Operators can get the best on line guidance by the optimization of configuration under various system operating conditions using developed data optimization techniques, and by developing the advanced intelligent decision-making software based on the abundant data accepted from the integrated automation system for Substation. Developing default diagnosis software and power system restauration software becomes significant for ensuring system's security and economy.To analyze power system, past(history) data, current(real-time) data and future (planned) data are needed. The future data will be obtained from the load forecasting, i.e. Load forecasting is set up from the real-time data gathered from SCADA and operated on it to get results. Enhancement of load forecasting will enhance the system safety and economy.Being a part of the project of the Intelligent Decision-making Supporting Systems in Urban Power System (IDSS) for Electric Power Bureau Nanyang Henan, This thesis mainly contains two parts. The first one is to analyze the need of application software to the graphic interface and functions that the graphic platform should have, to study principle of the separation between graph and data, and graphic hierarchical structures, and to introduce method of Object Oriented Design(OOD)and the ActiveX skills. Another one is to study algorithm of load forecasting, and to adopt multinomial regression model as the basic model to forecasting load data for IDSS.As an intuitionistic, friendly, convenient and effective man-machine intercourse method, graphic interface has been widely used in power system software and becomes necessary for online tide power flow, relay protection setting, power system planning and the SCADA system. As a main method of man-machine intercourse, it should be considered such problems as friendly interface, clear structure, convenient operation as well as property of protracting graph. Comprised of electric connection figure, total net flow, all kind of stick figure, the man-machine interface reflect not only' device configure and network configuration, but also the online and simulated operating status.As a public platform, the graphic platform not only fulfils the demands of many kinds of software nowadays, but also suites the coming demands. Combined with the development of graphic platform, this thsis mainly deals with problems as follows:(1) Application of Object Oriented Technique Techniques of OOP, COM, Automation and database are used in developing man-machine interface.(2) Separation of Graphic Functions Functions that graphic platform should possess the relationships of the platform to graphic interface, data, application program are analyzed. The separation of graphic functions is realized and consequently the system becomes more universal, open and expansible.(3) Control and Interface The necessity of setting up a real-time database as well as how to make ActiveX interface and expanding the control function is discussed.(4) Expansion of Graphic Functions Some new graphic functions such as for basic data recording function, power system component information amending function and virtual switch are expanded.Load forecast information is imperative for controlling, running and planning of power systems. Correct load forecast is important to both secure and economical system operation. Load forecast in DDSS is mostly used in analyzing the system security and economy, hi this system, two modes are considered, i.e. the practical mode and the simulated mode. Load forecasting is used for the later one. In this mode, we need to correct the current running mode. First we should simulate system component status and related load forecasting value under new system running condition, then analyze the security and economy. At last giving some o... |
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