Abstract
A decentralized expert system for voltage control of a large scale power system is proposed in this paper. The expert system is useful in dealing with modern large scale interconnected power systems which are characterized by complex and large computational burdens. The expert system consists of multiple local expert systems. Each local expert system is concerned with a part of the global system. The local expert systems work in parallel to perform their jobs: checking the existence of the violation and finding the most suitable control action. The sensitivity tree technique is adopted in finding the controller. The area of the system treated by a local expert system depends on the place of the violation and the place of the controller. The expert system makes use of the necessary system information and, at the same time, has the advantages of decentralized approaches, such as small computing time and small computer memory. This makes the expert system suitable for on-line applications. The expert system was tested, and encouraging results were obtained.
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