A hybrid method and its applications to analyse the low frequency oscillations in the interconnected power system

In this study, a hybrid method is proposed to calculate oscillatory parameters and the approximate mode shapes (AMSs) of low frequency oscillations based on the measured signals from wide area measurement system. This method not only overcomes the limitations of the single algorithm, but also integr...

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Bibliographic Details
Published in:	IET generation, transmission & distribution Vol. 7; no. 8; pp. 874 - 884
Main Authors:	Yang, Dechang, Rehtanz, Christian, Li, Yong, Yang, Deyou
Format:	Journal Article
Language:	English
Published:	Stevenage The Institution of Engineering and Technology 01.08.2013 Institution of Engineering and Technology The Institution of Engineering & Technology
Subjects:	Algorithms Applied sciences Approximation benchmarking Decomposition Electrical engineering. Electrical power engineering Electrical power engineering Exact sciences and technology generalised reduced gradient algorithm generator bus voltage control Gibbs phenomenon gradient methods GRG Heat treatment IEEE 118‐bus test system IEEE 1211‐bus system IEEE 14‐bus test system IEEE 2975‐bus systems IEEE 300‐bus test systems IEEE 30‐bus test system IEEE 57‐bus test system IEEE standards load flow control Low frequencies Mathematical models Miscellaneous mixed complementarity formulation approach Newton‐Raphson method Newton‐Raphson solution method numerical robustness optimisation optimisation‐based model Oscillations power flow problem Power networks and lines reactive power control reactive power limit robust control voltage control voltage recovery processing IEEE 14-bus test system IEEE 2975-bus systems Newton-Raphson method IEEE 30-bus test system benchmarking NR generator bus voltage control IEEE 1211-bus system generalised reduced gradient algorithm IEEE 57-bus test system Newton-Raphson solution method voltage recovery processing optimisation IEEE 118-bus test system robust control IEEE standards gradient methods numerical robustness optimisation-based model IEEE 300-bus test systems mixed complementarity formulation approach load flow control reactive power limit power flow problem PF reactive power control GRG voltage control Performance evaluation Electrical network Decomposition method Empirical method Interconnected power system System simulation Vibrational mode Algorithm Low frequency Shape detection Hilbert transformation
ISSN:	1751-8687, 1751-8695
Online Access:	Get full text
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Summary:	In this study, a hybrid method is proposed to calculate oscillatory parameters and the approximate mode shapes (AMSs) of low frequency oscillations based on the measured signals from wide area measurement system. This method not only overcomes the limitations of the single algorithm, but also integrates the advantages of the used techniques. First of all, two-level decomposition is presented to minish the scale-mixing influence in the empirical mode decomposition. Then, the Gibbs phenomenon of traditional Hilbert transform (HT) is reduced by using the normalised HT. Next, the relative phase calculation algorithm is introduced to realise the generator grouping and mode shape identification. Finally, the AMSs of dominant oscillation at different time ranges and frequency distributions are determined. The EPRI–36 bus simulation model and actual measured signals are used to evaluate the performances and validities of the proposed hybrid method.
Bibliography:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-2 content type line 23
ISSN:	1751-8687 1751-8695
DOI:	10.1049/iet-gtd.2012.0291