Inhibition of Subsynchronous Oscillation of Direct-Drive Wind Turbine by Improved LADRC in Weak Grids

doi:10.11930/j.issn.1004-9649.202206135

Abstract

Abstract: As the direct-drive wind turbine generator system (WTGS) causes subsynchronous oscillation (SSO) in weak grids, this paper proposes the differential feed-forward linear active disturbance rejection control (LADRC) based on the first-order total disturbance deviation control. It uses the fully improved LADRC strategy to suppress the SSO phenomenon (here, “fully” indicates that the outer loop of voltage, the inner loop of current, and the phase-locked loop (PLL) are all controlled accordingly). Firstly, the mathematical model for the grid connection of the direct-drive WTGS is built. Secondly, the improved LADRC is designed, and its characteristics are analyzed in combination with the grid-connected system of WTGS. The analysis shows that the improved control not only reduces the tracking error of the system but also has stronger anti-interference performance compared with the traditional LADRC. Finally, the proposed strategy is compared with the fully proportional-integral (PI) control and all-traditional LADRC by simulation software PSCAD/EMTDC. The results indicate that compared with the traditional LADRC, the proposed method reduces the overshoot by 1.62% while shortening the system regulation time by 0.129 s, which can effectively suppress the SSO phenomenon and have good adaptability.

Key words: weak grid, direct-drive wind turbine generator system, subsynchronous oscillation, total disturbance deviation control, differential feed-forward, LADRC

LI Bohao, GUO Kunli, LV Jiajun, CAI Weizheng, LIU Luhao, LIU Fengyi, HAO Yifan. Inhibition of Subsynchronous Oscillation of Direct-Drive Wind Turbine by Improved LADRC in Weak Grids[J]. Electric Power, 2023, 56(4): 56-67.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202206135

https://www.electricpower.com.cn/EN/Y2023/V56/I4/56

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