On-line monitoring of eigen-frequency and stability of power system by use of SMES |
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Affiliation: | 1. University of Wuppertal, School of Mathematics and Natural Sciences, Gaußstraße 20 42119 Wuppertal, Germany;2. Martin-Luther-University Halle-Wittenberg Halle (Saale) 06099, Germany;3. Institut für Numerische und Angewandte Mathematik, Georg-August-University Göttingen, Lotzestr. 16-18, D-37083 Göttingen, Germany;4. Martin-Luther-University Halle-Wittenberg, Faculty of Natural Sciences II, Institute of Mathematics Halle\n06099, Germany |
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Abstract: | It is useful to grasp power system stability margin from on-line data in real time. We have proposed to estimate the system operating conditions from on-line data by use of superconducting magnetic energy storage (SMES) system. In this paper, we developed the proposed method to monitor the eigen-frequency of the power system in real time, which changes with time due to the system operating conditions (such as, generator output change), by use of a SMES and a lock-in amplifier. Basic experiments were carried out on an analogue-type power system simulator and a model SMES for the simulator. By use of the SMES, the eigen-frequency change according to the operating condition change was successfully measured, tracked and monitored on-line. The stability margin can be estimated by the monitored eigen-frequency. The availability of the proposed method is discussed on the experimental results. |
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