LEs based framework for transient instability prediction and mitigation using PMU data. Issue 14 (1st November 2016)

• Record Type: Journal Article
• Authors: Rashidi, Mehran; Farjah, Ebrahim
• Is Part Of: IET generation, transmission & distribution. Volume 10:Issue 14(2016)
• Page Start: 3431
• Page End: 3440
• Publication Date: 2016-11-01
• Subjects: phasor measurement -- power system transient stability -- support vector machines -- power engineering computing -- distributed power generation; transient instability prediction -- transient instability mitigation -- PMU data -- Lyapunov exponent -- LE‐based framework -- post‐fault voltage magnitudes -- support vector machines -- phasor measurement units -- power grids -- optimal PMU placement -- network topology -- measurement errors -- LE‐based controlled islanding scheme -- boundary circuits -- generation‐load imbalance; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2015.1482
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : This study presents a Lyapunov exponent (LE)‐based framework for transient instability prediction and mitigation using wide area measurement systems data. For transient instability prediction, maximum LEs calculated using post‐fault voltage magnitudes are used as input features to support vector machines to predict the transient stability status. To ensure that the proposed transient instability prediction approach does not rely on full network observability and is effective even if limited numbers of phasor measurement units (PMUs) are installed across large power grids, an optimal PMU placement from the transient stability point of view is also proposed. The robustness of the proposed instability prediction scheme is verified with respect to network topology change and measurement errors. For transient instability mitigation, an LE‐based controlled islanding scheme is proposed. The proposed controlled islanding scheme determines the coherent generators, identifies proper load buses that should remain inside each group of coherent generators, specifies the boundary circuits and finally partitions the system into different islands while placing the coherent generators in the same island, maintaining connectivity inside islands and minimising the generation–load imbalance of islands.