为提高风电并网系统中电网侧逆变器直流母线电压的稳定性和动态响应速度，文中设计一种无对象模型辅助的二阶线性自抗扰控制技术（linear active disturbance rejection control, ADRC）以取代电压外环的PI控制器，从而形成一种新的双闭环控制结构。文中利用频域分析法分析了ADRC控制器的稳定性、跟踪性和抗扰能力；最后在3.6 MW直驱永磁同步风力发电机组的物理实验平台中验证了该控制结构的可行性，将传统PI控制和文中所提出的控制模式在不同工作条件下的控制效果进行比较。实验结果表明，该文章设计的控制方案优于传统的PI控制器，具有良好的抗干扰性和鲁棒性，大大减少直流侧母线电压波动所造成的影响。
英文摘要:
In order to improve the stability and dynamic response speed of the DC bus voltage of the grid side inverter in the wind power grid-connected system, a second-order linear active disturbance rejection control (LADRC) without object model assistance is designed to replace the PI controller of the voltage outer loop, thus forming a novel double closed-loop control structure. In this paper, the frequency domain analysis method is utilized to analyze the stability, tracking and anti-interference ability of ADRC controller. Finally, the feasibility of the proposed control structure is verified in the physically realized mechatronic systems of 3.6MW direct drive permanent magnet synchronous wind turbine, and the control effect of traditional PI control and the control mode proposed in this paper is carried out comparison under different working conditions. The experimental results show that the control scheme designed in this paper is superior to the traditional PI controller, and has good anti-interference and robustness, greatly reducing the impact of DC side bus voltage fluctuation.