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Recent Advances in Electrical & Electronic Engineering

Recent Advances in Electrical & Electronic Engineering

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ISSN (Print): 2352-0965
ISSN (Online): 2352-0973

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Research Article

Stability Analysis of Direct-drive Wind Turbines Connected To Weak Grid Using Linear Immunity Impedance Modeling

Author(s): Can Dingorcid of author, Houjun Yang*orcid of author, Yudong Shi and Ying Bo Ji

Volume 18, Issue 10, 2025

Published on: 06 January, 2025

Article ID: e23520965333575

Pages: 13

DOI: 10.2174/0123520965333575241024063350

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Abstract

Background: With the direct-drive wind turbine connected to the weak grid, subsynchronous oscillation (SSO) problems occur frequently. The use of traditional control strategies to inhibit it has a poor effect and will seriously threaten the stability of system operation.

Methods: This paper initially analyzes the factors that give rise to subsynchronous oscillation (SSO) based on the established sequential impedance model for direct-drive wind power grid connection. Through impedance sensitivity analysis of the control parameters, it is found that the proportional gain of the current loop and that of the phase-locked loop are the dominant factors generating the risk of SSO. Secondly, considering that Linear Active Disturbance Rejection Control (LADRC) has a faster response speed and stronger anti-disturbance ability compared with the traditional Proportional Integral (PI) control, this paper replaces the phase-locked loop and currentloop PI control with the self-resistant controller. The second-order extended state observer is employed to perform real-time estimation and compensation of system perturbations.

Results: After performing simulation and frequency domain analysis on the MATLAB/Simulink platform, it is found that compared with traditional PI control and voltage feedforward control strategies, the direct-drive wind power grid-connected system using LADRC control can effectively suppress oscillations under different weak grids and possess better robustness.

Conclusion: The direct-drive wind power grid-connected system equipped with LADRC control can effectively suppress oscillations under different weak grid conditions and shows good robustness.

Keywords: Weak Grid, LADRC, sequential impedance model, direct drive, permanent magnet, synchronous generator, SSO, sensitivity analysis.

Graphical Abstract

Graphical abstract illustrating key findings of the study

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