Improvement to observability measures of LFO modes in power systems with DFIGs

Abstract

Observation of the low-frequency oscillation (LFO) modes in power systems is important to design the damping scheme. The state equations of the power system with the doubly-fed induction generators (DFIGs) are derived to find the LFO modes related to the synchronous generator (SGs) and the DFIGs. The definition of the observability measure is improved to consider the initial output and the attenuation speed of the modes. The sensitivities of the observability measures to the control parameters are derived. The numerical results from the small and large-disturbance validate the LFO modes caused by the DFIGs, and different observability measures are compared. Adjustment of the control parameters is chosen based on the sensitivity model to improve the observability and damping ratio of the LFO mode, and the stability of the wind power system.

Key words： wind power system; low-frequency oscillation (LFO); observability measure; sensitivity; doubly-fed induction generator (DFIG)

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51877061).

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