DING Chen,WANG Peng,ZHAO Haoran,et al.Online Impedance Identification and Stability Analysis Method for Wind Farm Based on Annulus Theorem[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20251229006.
DING Chen,WANG Peng,ZHAO Haoran,et al.Online Impedance Identification and Stability Analysis Method for Wind Farm Based on Annulus Theorem[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20251229006.DOI:
Online Impedance Identification and Stability Analysis Method for Wind Farm Based on Annulus Theorem
Due to the rapid time-varying operation status of wind power generation and the usual unknowns of unit structures and parameters
there is an urgent need for an online small-signal stability analysis method for grid connection to assess stability. This paper proposes an on-line impedance construction method based on piecewise affine and a fast stability judgment method based on annulus theorem. In terms of impedance identification
an off-line affine modeling and online linear calculation method is proposed. The agglomerative hierarchical clustering algorithm is used to optimally partition the parameter space
and within each partition
the impedance is expressed as a first-order explicit function of operation status variables and complex variables. On-line
it is only necessary to measure the real-time operation working point to quickly locate the parameter partition and determine the corresponding impedance. In terms of stability judgment
an eigenroot search method based on the annulus theorem is proposed
which can quickly search for the dominant oscillation mode on-line. The proposed method uses the coefficients of the characteristic equation to judge the position of the annulus where eigenroots are located
avoiding the complex calculations caused by directly solving the characteristic equation. Through case study analysis
it is verified that the proposed method has high computational efficiency and accuracy
and can be applied to the on-line oscillation stability analysis of wind turbines.
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references
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