【作者】 王占朝；

【导师】 王海滨；

【作者基本信息】 西华大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 电力工业是国民经济的基础产业,是国家的经济基础之一,它的安全稳定运行对国民经济的发展有着举足轻重的作用。在电力系统运行中,由于设备的检修和运行方式的改变,必须经常进行系统的倒闸操作。因而由这种频繁的倒闸操作引起的误操作带来的事故比例相当大,给系统安全运行带来很大的威胁。操作票制度就是电力生产管理部门为了防止误操作、保证电网安全稳定运行而采取的一种重要组织措施。随着电力系统的不断发展、电网结构的日益复杂,快速、准确的操作票编写工作面临着前所未有的挑战,显然,传统的操作票编写方式已经不能满足新形势下电力系统的发展要求。这样,一种新的操作票自动生成系统必然将取而代之,成为电力系统运行人员进行电网调度的一个重要辅助工具。本文在分析现有的操作票专家系统的基础上,采用面向对象技术编程,结合专家系统理论和计算机图形学理论,利用Microsoft SQL Server 2000关系数据库和Delphi6.0开发工具,开发出一套基于面向对象的图形化操作票专家系统。本系统具有以下特点:一、提出了产生式知识表示和面向对象知识表示相结合的知识表示方式,使整个知识库易于修改和扩充,维护工作量大大降低;在推理机制的实现上,采用正向推理的推理控制策略和深度优先的搜索策略,大大的提高了推理机制的效率。二、采用面向对象技术,根据工厂模式实现电气设备图元类的设计,提高了代码的重用性和可维护性;在建立设备图元类模型的基础上,利用计算机图形学的相关算法,完成了图形的各种操作功能,如拾取、删除、移动、缩放等。三、引入图库一体化概念,利用关系数据库模型存储设备图形的属性参数信息,开发出来的一次接线图绘图模块具有与图形数据库相互访问的功能,并且数据库可以接受来自SCADA系统的实时数据。四、对不同的用户赋予不同的访问权限,控制用户可以进行的各种操作,限定访问哪些目录、文件和其他资源,建立起明确的责任机制,为系统提供责权分明的有效保护,有利于管理工作的标准化。五、采用三层的C/S网络结构,提高了服务器的运行效率,网络负载得以平衡,系统安全性也提高了。六、除此之外,系统还具有其他辅助功能,如操作票查询统计、演示培训等。更多还原

【Abstract】 Power industry is the basic industry of civil economy, and is the one of economic base of the country. Its secure work is rather important to the development of civil, economy. In the running process of power system, it needs do many switching operations for devices examined and the running way changed. Error operations brought by switching operations done frequently will result in larger percent accidents, this will threaten the power system run greatly. Switch sequence system is an important measure for power management department to avoid the error operations and secure power grid run safely. With the development of power system and the complexity of power grid structure, it is very difficult to write switch sequence correctly and quickly. Obviously, traditional writing way has not been met to the development needs of power, system in this situation. So a new switch sequence system is needed as the aided tool for operators to progress power grid dispatched.According to the analysis of the existed switch sequence expert system, the expert system of graphics aided switch sequence based on object-oriented is presented with the object-oriented programming and the theory of the expert system and computer graphics, the database of Microsoft SQL Server 2000 and the tool of Delphi6.0. The distinguishing features of the system are as followings:1. A new knowledge representation combining the produce style representation and the Object-Oriented representation is proposed in the paper, which facilitates modification and expansion of knowledge rules and reduces the workload of the maintenance. Forward inference control strategy and the deep-prior search strategy are used to realize the inference engine, which improves the efficiency of the inference engine largely.2. The graphic class of devices is designed by the object-oriented technology and factory method, which improves the reuse and maintenance of codes. On the basis of the constructed model of graphic class, many functions of graphics are achieved by the aid of some algorithms of computer graphics, such as: selection, deletion, movement and so on.3. The concept of integration of graph-based database is used in this system, the relation database model is adopted to memory the parameter information of graphics, the drawing module of the main wiring diagram has the accessing function with the drawing database each other, and the database can receive the real-time data from SCAD A system.4. Different users have different accessing permission in the system, in order to control the allowable operations of different users and confine the accessible files and data. Setting up this clear duty, this provides effective protection for the system and promotes management work to be standardization.5. Three-layer network structure is adopted in the system, and it will enhance the efficiency of server and the security of system.6. In addition, some other accessorial functions are provided in the system, such as the inquiring and counting switch sequence, the demonstration and train of the system, and so on.更多还原