NDLI: Mitigation of three-phase unbalancing for distribution feeders by rephasing of laterals and distribution transformers

Content Provider	IEEE Xplore Digital Library
Author	Lin, C.H. Chen, C.S. Ku, T.T. Ho, C.Y.
Copyright Year	2010
Description	Author affiliation: Department of Electrical Engineering, I-Shou University, Ta-Hu Hsiang, Kaohsiung County, Taiwan (Chen, C.S.) \|\| Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan (Ku, T.T.) \|\| Department of Electrical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan (Lin, C.H.) \|\| Department of Electrical Engineering, Kao Yuan University, Lu Chu, Taiwan (Ho, C.Y.)
Abstract	In this paper, an expert system is designed to derive the rephasing strategy of laterals and distribution transformers to enhance three-phase balancing of distribution systems. The heuristic rules adopted by distribution engineers are incorporated in the knowledge base of the expert system in the problem-solving process. The neutral current reduction algorithm is developed to support the inference engine to derive the rephasing strategy to reduce the neutral current of distribution feeder so that the tripping of over-current relay can be prevented and the customer service interruption cost and labor cost to execute the rephasing strategy can be justified by the power loss reduction obtained. To demonstrate the effectiveness of the proposed expert system to enhance three-phase balance, a practical distribution feeder in Taiwan Power Company (Taipower) is selected for computer simulation. By minimizing the objective function subjected to the rephasing rules, the rephasing strategy has been derived to identify the laterals and distribution transformers for phasing adjustment. After executing the proposed rephasing strategy by Taipower engineers, the phase currents and neutral current of test feeder has been collected by the SCADA system to verify the reduction of neutral current. The power loss reduction obtained by three-phase balancing has been solved by three-phase load flow analysis, which is then used to justify the customer service interruption cost and labor cost for rephasing of test feeder.
Starting Page	1
Ending Page	6
File Size	890390
Page Count	6
File Format	PDF
ISBN	9781424465460
e-ISBN	9781424465484
DOI	10.1109/TDC.2010.5484542
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-04-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transformers Costs Expert systems Customer service Knowledge engineering Problem-solving Inference algorithms Engines Power system relaying Computer simulation customer information system expert system outage management system
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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