• Title/Summary/Keyword: Yoon-Sang

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AN EXPERT SYSTEM FOR SETTING AND COORDINATION OF PROTECTIVE RELAYS (보호계전기의 정정 협조 전문가 시스템)

  • Lee, Seung-Jae;Kim, Ki-Hwa;Cho, Young-Ik;Yoon, Sang-Hyun;Yoon, Man-Chul;Lee, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.358-362
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    • 1991
  • This paper describes enhancements made on PROSET, an, expert system which can perform setting and coordination of protective relays used in the ultra-high voltage transmission systems. Enhancements include the friendly and convenient environment for rulebase management and system manipulation, expanded setting capability, and faster processing speed which have been achieved through adoption of the new rule representation, rule order independent IE, rulebase editor, local database generator, Interface to PSS/E fault program, RB expansion etc.

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A Simple Method for Identifying Mechanical Parameters Based on Integral Calculation

  • Han, Sang-Heon;Yoo, Anno;Yoon, Sang Won;Yoon, Young-Doo
    • Journal of Power Electronics
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    • v.16 no.4
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    • pp.1387-1395
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    • 2016
  • A method for the identification of mechanical parameters based on integral calculation is presented. Both the moment of inertia and the friction constant are identified by the method developed here, which is based on well-known mechanical differential equations. The mechanical system under test is excited according to a pre-determined low-frequency sinusoidal motion, minimizing the distortion, and increasing the accuracy of the results. The parameters are identified using integral calculation, increasing the robustness of the results against measurement noise. Experimental data are supported by simulation, confirming the effectiveness of the proposed technique. The performance improvements shown here are of use in the design of speed and position controllers and observers. Owing to its simplicity, this method can be readily applied to commercial inverter products.

Development of Expert System for Protection Coordination of Transmission Systems (송전계통 보호 협조 전문가 시스템의 개발)

  • Lee, Seung-Jae;Park, Young-Moon;Shim, Joung-Wook;Yoon, Sang-Hyun;Yoon, Man-Chul;Lee, Sang-Ok
    • Proceedings of the KIEE Conference
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    • 1990.07a
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    • pp.129-132
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    • 1990
  • This paper reports an expert system for coordination of protective relays in the high voltage transmission system. The proposed system consists of five modules and has adopted the frame and production rule representations achieving the efficient data storage and knowledgebases. It has an interface to the fault program PSS/E and has reduced the data retrival time by implementing the local database containg only the minimum information for the process. Different relay parameters and output formats of the setting results can be easily incorporated owing to the rule-based structure. Graphics-based output helps understanding of the process and enhances the practical power.

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