Identification of Dominant Factors of Sub-synchronous Oscillation Energy Based on VMD and Subjective and Objective Weighting

Yanhui XU; Hui LIU; Yundan CHENG; Guanqun SUN; Defu CAI; Erxi WANG

doi:10.12204/j.issn.1000-7229.2024.03.013

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Electric Power Construction ›› 2024, Vol. 45 ›› Issue (3) : 137-148. DOI: 10.12204/j.issn.1000-7229.2024.03.013

Identification of Dominant Factors of Sub-synchronous Oscillation Energy Based on VMD and Subjective and Objective Weighting

Yanhui XU ¹ ,
Hui LIU ¹ ,
Yundan CHENG ¹ ,
Guanqun SUN ² ,
Defu CAI ² ,
Erxi WANG ²

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Abstract

The energy characteristics of sub-synchronous oscillations in new power systems are closely related to operating conditions, control parameters, and the external environment. Therefore, the extraction of the energy characteristics of sub-synchronous oscillations and the identification of the dominant factors based on the measured data under different scenarios can effectively solve the sub-synchronous oscillation problems in practical engineering. In this study, we propose a data-driven method to identify the factors influencing sub-synchronous oscillation energy characteristics. First, it solves the modal mixing problem based on the variational modal decomposition to extract the accurate sub-synchronous oscillation modes; second, it derives the expression of sub-synchronous oscillation energy function based on the port energy and uses the modal extraction results to calculate the energy function; finally, it uses the subjective and objective weighting to establish an evaluation model to identify the dominant factors of sub-synchronous oscillation energy characteristics by considering the subjective and objective weights. The simulation results of the wind farm grid-connected sub-synchronous oscillations built based on the PSCAD/EMTDC platform verified the effectiveness of the proposed method.

Key words

sub-synchronous oscillation / energy characteristics / dominant factors / variational mode decomposition (VMD) / subjective and objective weighting

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Yanhui XU , Hui LIU , Yundan CHENG , et al . Identification of Dominant Factors of Sub-synchronous Oscillation Energy Based on VMD and Subjective and Objective Weighting[J]. Electric Power Construction. 2024, 45(3): 137-148 https://doi.org/10.12204/j.issn.1000-7229.2024.03.013

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