考虑母线电压滤波的逆变器自抗扰控制器设计

在永磁直驱风力发电并网系统中，通常将逆变器直流母线电压作为电压外环控制目标，由于测量误差及噪声的存在，常用惯性环节滤波后的母线电压作为反馈。在典型的电压外环自抗扰控制系统中，因未考虑滤波器的影响，使得控制反馈与实际系统输出存在幅值相位差异，进而影响系统控制性能。文章将通过一阶惯性环节滤波的信号扩张成新的状态变量，由改进的线性扩张状态观测器对滤波前母线电压进行估计并反馈，可消除因惯性环节导致的母线电压纹波。实验仿真表明，系统在观测噪声扰动和电网侧电压故障情况下具有较强的抗干扰性能。

Design of active disturbance rejection controller of inverter considering bus voltage filter

In the grid connection system of permanent magnet direct-drive wind power generation, the DC bus voltage of the inverter is usually used as the voltage outer loop control target. Due to the existence of measurement errors and noise, the bus voltage filtered by the inertial link is often used as feedback. In the traditional voltage outer loop second-order auto disturbance rejection control system, because the influence of the filter is not considered, there is a phase difference in amplitude between the control feedback and the actual system output, which affects the system control performance. In this paper, the signal filtered through the first-order inertial link is expanded into a new state variable, and the improved linear expansion state observer estimates and feedbacks the bus voltage before filtering, which can eliminate the bus voltage ripple caused by the inertial link. The simulation results show that the system has strong anti-interference performance under the condition of observing noise disturbance and grid-side voltage fault.