Optimum line reclosing time for the enhancement of interconnected power system stability
Author(s): CAI Guowei, k.w.chan, SUN Zuo, XIE Dongyan
Pages: 422-428
Year: 2003 Issue: 4
Journal: JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY(NEW SERIES)
Keyword: power system stability; automatic line reclosing scheme; network transient energy; optimumreclosing time;
Abstract: Automatic line reclosing schemes used in an extra-high-voltage power system is an economical and effective means to maintain transient stability. A novel method is proposed in the paper to adaptively optimize the automatic line reclosing time after a transient fault for enhancement of interconnected power system transient stability. Both the study on the transient energy over network and the structure-preserving multi-machines power system model illustrate that the excessive convergence of potential energy on the lines with a certain cutset deteriorate power system stability, and therefore, an optimum line reclosing strategy can be established by minimizing the change in transient potential energy distribution across a cutsct lines in the vicinity of the faulty line as an optimization target, and the optimal reclosure time is set to the time of minimum line phase angle difference.Without any pre-determined knowledge, the method is adaptive to various power system operation modes and fault conditions, and easy to implement because only a limited number of data measured at one location on a tieline linking sub-networks are required. Simulations have been performed with the OMIB( One Machine and Infinite Bus System) and a real inter-connected power system to verify the applicability of the method proposed.
Pages: 422-428
Year: 2003 Issue: 4
Journal: JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY(NEW SERIES)
Keyword: power system stability; automatic line reclosing scheme; network transient energy; optimumreclosing time;
Abstract: Automatic line reclosing schemes used in an extra-high-voltage power system is an economical and effective means to maintain transient stability. A novel method is proposed in the paper to adaptively optimize the automatic line reclosing time after a transient fault for enhancement of interconnected power system transient stability. Both the study on the transient energy over network and the structure-preserving multi-machines power system model illustrate that the excessive convergence of potential energy on the lines with a certain cutset deteriorate power system stability, and therefore, an optimum line reclosing strategy can be established by minimizing the change in transient potential energy distribution across a cutsct lines in the vicinity of the faulty line as an optimization target, and the optimal reclosure time is set to the time of minimum line phase angle difference.Without any pre-determined knowledge, the method is adaptive to various power system operation modes and fault conditions, and easy to implement because only a limited number of data measured at one location on a tieline linking sub-networks are required. Simulations have been performed with the OMIB( One Machine and Infinite Bus System) and a real inter-connected power system to verify the applicability of the method proposed.
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