Showing papers by "Chen-Ching Liu published in 1988"
TL;DR: In this article, an expert system is developed which can be utilized as an online aid to system operators in a distribution SCADA (supervisory control and data acquisition) environmental, implemented in Prolog.
Abstract: An application of expert system techniques to the restoration of distribution systems is reported. Primary feeders are typically radial in structure. To increase system reliability, neighboring feeders are connected through a normally open tie switch. When load zones on a feeder interrupted due to a fault, system operators need to identify neighboring feeders and try to restore customers through the tie switches. To restore the maximum number of zones, several steps are followed: group restoration, zone restoration and, if necessary, load transfer. Based on the methodology, an expert system is developed which can be utilized as an online aid to system operators in a distribution SCADA (supervisory control and data acquisition) environmental. The proposed expert system is implemented in Prolog. Knowledge representation, portability of the system, and computational efficiency are discussed. Several examples illustrate the capabilities of the system. >
443 citations
11 Apr 1988
TL;DR: In this article, the authors present a new method for calculating switching time from an accurate and explicit form of the switching condition, hence the step-by-step search for the switching instant can be greatly simplified.
Abstract: Fast long-term dynamic simulation of power converters is discussed. Because of switching actions, the converter can operate in different configurations and, therefore, it can be represented by a state-space time-varying linear system. This paper presents a new method for calculating switching time from an accurate and explicit form of the switching condition, hence the step-by-step search of the switching instant can be greatly simplified. In the proposed algorithm, a converter is partitioned into subsystems, which are simulated in a decoupled manner and coordinated through data exchange. >
51 citations
TL;DR: The proposed expert system ERP (Enhanced Restoration Planner) is implemented in PROLOG and is able to come up with appropriate switching actions within a few seconds and can be a powerful tool in aiding the distribution system dispatchers in emergency situations.
4 citations
01 Jan 1988
TL;DR: This study proposes an analytical method for evaluating the processing time of forward-chaining rulebased systems, and an upper bound on the computations is presented.
Abstract: For real-time applications of expert systems, such as the operation and control of power systems, the success depends on me computational efficiency of the programs. In this study, we propose an analytical method for evaluating the processing time of forward-chaining rulebased systems. An upper bound on the computations is presented. Numerical examples are presented which point out the importance of rule and data structures in the efficient implementation of rule-based systems.