具有学习功能的专家系统的设计

DESIGH OF EXPERT SYSTEM WITH STUDY FUNCTION

专家系统在电力系统的许多领域已得到广泛的应用。然而，由于电力系统领域知识往往具有经验性知识较多的特点，所以开发具有学习功能的专家系统有一定难度。本文根据继电保护日常运行管理领域知识的固有特点，对本专家系统中模型库和规则库的建立进行了特殊的设计，使知识库（事实库、模型库和规则库）对用户完全开放，并模仿人类专家解决问题的思路，提出了“操作单元”的概念，以代替传统上采用“搜索定位”的概念进行规则设计，从而解决了系统在用户的指导下进行学习的问题，大大地提高了系统应用的灵活性，降低了系统维护费用。

Expert system has been widely applied in many fields of power system.However,since the field knowledge of power system is characterized with a lot of experiential knowledge,it is a bit difficult to develop an expert system with study function.In consideration of the inherent character of field knowledge about everyday operation management of relay protection,the paper makes a special design in the constructures of model base and rule base so that knowledge base (fact base ,model base and rule base)can be open to the general users .At the same time. the paper presents the concept of 'operation unit'to replace the traditional concept of 'searching location'in designing rules by simulating the human experts'ideas. Thus ,the study problem of expert sytem guided by user is properly solved. The flexibility of system's application is largely improved and the cost of system's maintenance is reduced. The method has the value of generalization.