Sub-synchronous oscillation suppression strategy for direct-drive wind farm based on current inner loop sliding mode active disturbance rejection control
DOI：10.19783/j.cnki.pspc.240353
Key Words:direct-drive wind farm  weak AC grid  sub-synchronous oscillation  sliding mode active disturbance rejection control
Author NameAffiliation
GUO Cheng Faculty of Power Engineering, Kunming University of Science and Technology, Kunming 650500, China 
YANG Xuanming Faculty of Power Engineering, Kunming University of Science and Technology, Kunming 650500, China 
WANG Linling Faculty of Power Engineering, Kunming University of Science and Technology, Kunming 650500, China 
YANG Lingrui Faculty of Power Engineering, Kunming University of Science and Technology, Kunming 650500, China 
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Abstract:A sliding mode active disturbance rejection control (SM-ADRC) strategy based on the current inner loop of the grid-side converter is proposed to address the problem of sub-synchronous oscillation (SSO) resulting from the amplification of the SSO components. First, considering the issue of high-frequency switching in sliding mode control (SMC) that affects the control performance, an improved exponential reaching law is designed, by replacing the original sign function with a boundary variable power function in the reaching law. Then, an extended state observer with active disturbance rejection control is introduced to estimate the SSO components in real-time and compensate for the current inner loop as observed quantities. This weakens the dependence of SM-ADRC control on the parameters of the grid-side controller and further cuts off the propagation path of the SSO components. Finally, an electromagnetic transient model of the direct-drive wind farm based on grid-side current inner loop SM-ADRC control is established. By comparing the SSO suppression effect with the current inner loop PI control and SMC control, the superiority of the proposed SM-ADRC strategy is verified.
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