| Filling in switching operation sequences is a usual job for substation staffs, and it is very important to ensure the correct switching operations. As it is easy to omit or redundantly add some operation items, as well as write items that may mismatch operation criterion, it is difficult to fill in a correct and clear switching operation sequence. So it becomes a very critical problem to solve for substation operators.To tackle this challenge, lots of work and solutions have been done or designed. However, these solutions have certain shortcomings. Some solutions can only be applied to a particular substations. As the structure of substation was determined during design, if we want to apply such solutions to other substations, then perhaps we must rewrite them totally, thus it will greatly increase the software cost. Some solutions can only use typical operation sequences, but not check devices' logic of locking and actual operating mode. When line's actual operating mode is not consistent with the typical sequence, it will lead to serious consequence. To remove these faults, based on the analysis of current solutions, combining the theory of expert system, this paper presents a new operation sequence expert system with graphical user interface. The system is mainly developed by Visual C++ and Microsoft Access database, and it is object-oriented.The main features of this system are as follows:1.based on the analysis of production rule representation method's insufficiency, a new knowledge representation method has been proposed. It combines the"rule skeleton + rule body"group and object-oriented knowledge representation method, which makes it easy to modify and expand the whole knowledge base, and thus greatly decreases the maintenance workload. It adopts an inference technology that can combine RBFNN neural network and fuzzy control search strategy, which improves the efficiency of inference largely.2.it adopts object-oriented technology to realize substation devices' graphic metaclass based on factory mode, which improves code's reusability and maintainability. On the base of the model of devices' graphic metaclass, it adopts some computer graphic algorithms to accomplish graphical operation functions, such as write, read, delete, move and so on.3.it has powerful privilege management. It can set different password for operators, guardians and administrators.. It can give distinct privilege according to user's name. It can control all the operations of users, such as limitation to access certain directory, file or other resources. Through such clearly privilege mechanism, it provides effective protection to the system and facilitates the normalization of management.4.it adopts whole graphical user interface to produce operation sequence. It can produce various correct operation sequences according to running mode and practical situation of power system. It can produce operation sequence not only in real system, but also when system is off line. It can employ the experience of senior on-duty operator and it has strict measure to prevent fault. It has intelligent producing, single step producing function and self-definite maintenance function of typical sequence. Operation sequences can be saved as text file or in database, and operator can examine, classify, number, inquire, count or print the sequences.The operation sequence system in power system is an important measure. It is very necessary to develop an operation management system which is highly reliable, easy to use and maintain. In this paper, we introduce such an intelligent operation sequence expert system which adopts"rule skeleton + rule body"group knowledge representation method, combines RBFNN neural network with fuzzy control inference technology, and uses object-oriented technique. The system's interface is friendly, and it is simple and reliable. It is easy to master and maintain for operator, and it has highly general utilization, so it can be used in various voltage grade substations. |
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