{"title":"Fast automatic contingency analysis and ranking technique for power system security assessment","authors":"I. Musirin, Titik Khawa Abdul Rahnian","doi":"10.1109/SCORED.2003.1459698","DOIUrl":"https://doi.org/10.1109/SCORED.2003.1459698","url":null,"abstract":"One of the essential aspects of modern power system security assessment is the consideration of any contingencies arise due to planned or unplanned line outages leading to system overloads or abnormal system voltages. Several techniques have been developed in the past few years to address this problem but computation time has been identified as the constraint making the process inefficient. This paper presents a new algorithm for automatic contingency analysis and ranking caused by line outage in a power transmission system. All steps in the algorithms including the load flow analysis; removal and reinsertion of line and overall ranking process were accommodated in one complete programme making it a complete and effective solution for contingency analysis and ranking. A pre-developed line-based voltage stability index is used as a tool in determining the severity of the contingencies. Results from experiments showed that this technique is much faster than the existing technique while reducing human error constraint.","PeriodicalId":239300,"journal":{"name":"Proceedings. Student Conference on Research and Development, 2003. SCORED 2003.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130254560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance evaluation of solid state fault current limiters in electric distribution system","authors":"M. Hannan, A. Mohamed","doi":"10.1109/SCORED.2003.1459700","DOIUrl":"https://doi.org/10.1109/SCORED.2003.1459700","url":null,"abstract":"The expansion of electric distribution system has resulted in an increasing need of fault current limiter in so as to limit fault currents to the downstream protection devices as a means of improving power quality. Considerations in the use of fault current limiter are that it must be reliable in operation, compact and inexpensive. This paper presents a comprehensive performance evaluation on the use of solid-state fault current limiters (FCL) in a distribution system. The FCL simulation model has been developed using the electromagnetic transient program PSCAD/EMTDC and a new control strategy for the FCL has been proposed for instantaneous detection of over current. The FCL is evaluated in terms of its performance in limiting fault current to the tolerable limit of the system, as well as the response of the FCL within a fraction of a cycle of about 2 ms. The effects of varying circuit parameters such as R, L, and C as part of the FCL device has been investigated. It has been noted that the inductive reactor, which is part of the FCL device, is suitable for limiting the fault current. The impact of induction motor loads on the FCL has also been analyzed. Simulation results show that the FCL is effective for reducing short circuit currents and also can be used to protect bus bars from voltage sag when the system is subjected to various types of faults.","PeriodicalId":239300,"journal":{"name":"Proceedings. Student Conference on Research and Development, 2003. SCORED 2003.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116891051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}