基于一阶LADRC控制的直驱风机次同步振荡抑制策略

针对直驱式风电机组接入弱交流电网诱发次同步振荡 (subsynchronous oscillation, SSO) 问题，提出一阶线性自抗扰控制(linear active disturbance rejection control, LADRC)策略抑制该现象，从而提高系统稳定性。首先，建立直驱式风电机组的并网数学模型，分析次同步振荡频率扰动分量的传播机理；然后，进行一阶LADRC电流内环控制器设计以及参数优化整定，分析表明：控制器对于次同步频率扰动分量有较强的抑制作用。最后，基于PSCAD/EMTDC仿真软件，建立传统PI和一阶LADRC控制的直驱式风电机组电磁暂态仿真模型。结果表明：所提方法能够阻断次同步频率扰动分量传播，有效抑制SSO。

Subsynchronous Oscillation Mitigation Strategy Based on First-Order LADRC for Direct-Drive Wind Turbines

Aiming at solving the problem of subsynchronous oscillations (SSOs) induced by direct-drive wind turbines connected to the weak AC power grid, this paper proposes a first-order linear active disturbance rejection control (LADRC) strategy to suppress this phenomenon, thereby improving system stability. Firstly, the grid-connected mathematical model of direct-drive wind turbines is built, and the propagation mechanism of frequency disturbance components of SSOs is analyzed. On this basis, we design the first-order LADRC inner-loop current controller and optimize and tune the parameters, and the analysis indicates that the controller has a strong inhibitory effect on the frequency disturbance components of SSOs. Finally, using PSCAD/EMTDC simulation software, we build an electromagnetic transient simulation model of direct-drive wind turbines controlled by traditional PI and first-order LADRC. The results demonstrate that the proposed method can block the frequency disturbance components of SSOs and effectively suppress SSOs.