Study on the Improvement of the Special Protection Scheme (SPS) in the Korean power system

Jeonghoon Shin, Suchul Nam, Seung-Tae Cha, Jaegul Lee, Taekyun Kim, Junyoen Kim, Taeok Kim, Hwachang Song

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper deals with the improvement of the special protection scheme (SPS) which has been applied to the low probability and high impact contingencies in the Korean power system since 2004. Simulation results about the recent event occurred on 765kV lines show that the current setting values of the SPS have to be revised and enhanced. In addition, by applying response-based undervoltage load shedding (UVLS) schemes with multi-step to severe contingencies in the system, we can have more effective results than those of the existing SPS. A centralized and a distributed UVLS schemes are considered in the simulation. ULTC based load recovery models and over excitation limiters (OXL) for the Korean power system are also included in the long term voltage stability analysis.
Keyword: Voltage Stability Analysis,Under Voltage Load Shedding,Special Protection Scheme
Original languageEnglish
Title of host publicationPower Systems Transients
Publication date2009
Publication statusPublished - 2009
Externally publishedYes
EventInternational Conference on Power Systems Transients 2009 - Kyoto, Japan
Duration: 2 Jun 20096 Jun 2009


ConferenceInternational Conference on Power Systems Transients 2009
Internet address


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