有源电力滤波器的自抗扰控制研究

针对采用PI控制器控制有源电力滤波器时存在谐波或基波电流指令而无法实现无静差调节,且数字化后会进一步增大稳态误差,使有源电力滤波器的补偿性能降低的问题,提出一种有源电力滤波器的自抗扰控制策略。该策略利用自抗扰控制器的非线性跟踪-微分器和扩张状态观测器分别处理参考输入和输出,并选择适当的状态误差,实现了对滤波的自动、精确补偿。仿真和实验结果表明,有源电力滤波器采用自抗扰控制策略后具有很强的鲁棒性、稳定性和适应性,控制性能有较大改善。

Research of active disturbance rejection control for active power filter

For problem that using PI controller to control active power filter can not realize floating control because of harmonic or fundamental current,and digitization will further increase steady-state error,so lead to reduce compensation performance of active power filter,a control strategy of active disturbance rejection control was proposed.The strategy uses nonlinear tracking differentiator and extended state observer of the active disturbance rejection controller to process reference input and output,and selects appropriate state error to achieve automatic and accurate filter compensation.The simulation and experiment results prove the filter has strong robustness,stability and adaptability,and improves control performance with the active disturbance rejection control strategy.