Adaptive Oscillation Suppression Strategy for Wind Farms Based on Windowed FFT

doi:10.11930/j.issn.1004-9649.202202028

Abstract

Abstract: Regarding the oscillation phenomenon in large-scale wind power transmission systems, the existing suppression strategies can hardly quickly and effectively suppress the oscillation when the oscillation frequency changes. To solve this problem, this paper takes the direct-drive wind farm transmission system as the research object and proposes an adaptive oscillation suppression method combining windowed fast Fourier transform (FFT) with an additional quasi-proportional resonant controller. Specifically, the harmonic linearization method is employed to build an impedance model for direct-drive wind turbines. The oscillation mechanism of the permanent magnet synchronous generator (PMSG) and the effectiveness of the additional quasi-proportional resonant controller in suppressing the oscillation are analyzed. Then, a fast detection and extraction method for oscillation frequency based on windowed FFT is designed, and the design principle of related parameters is presented. Finally, PSCAD/EMTDC electromagnetic transient simulation is conducted to compare the oscillation suppression effect of the controller based on windowed FFT with that of the controller based on traditional FFT. The results show that the controller based on windowed FFT has obvious advantages in oscillation suppression speed and effect, which verifies the effectiveness of the proposed oscillation suppression strategy.

Key words: direct-drive wind turbine, quasi-proportional resonance, oscillation suppression, impedance modeling, fast Fourier transform, window function

CLC Number:

TM712

MIAO Shuo, LI Qinan, ZHA Kunpeng, LI Lanfang, CAO Jianchun, ZHANG Fan. Adaptive Oscillation Suppression Strategy for Wind Farms Based on Windowed FFT[J]. Electric Power, 2022, 55(10): 112-123.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202202028

https://www.electricpower.com.cn/EN/Y2022/V55/I10/112

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