一种用于弱电网和畸变电网下并网逆变器谐波抑制与鲁棒性提升的新型RC-ESO-ADRC

Repetitive control-based extended state observer (RC-ESO) enhances the estimation accuracy of periodic harmonic disturbances. However, it exhibits a slow convergence rate of disturbance estimation, limited steady-state estimation accuracy, and a lack of systematic design. An improved active disturbance rejection control (ADRC) current control scheme based on a novel RC-ESO (NRC-ESO) is proposed in this article. An ideal compensation filter is used to design the NRC-ESO, achieving a faster convergence rate for disturbance estimation. In addition, a zero-phase low-pass filter is embedded in the NRC-ESO to reduce the current steady-state error and mitigate the impact of sensors high-frequency noise. The antidisturbance ability, tracking performance, system stability, and detail parameter optimization design of the NRC-ESO-based ADRC (NRC-ESO-ADRC) are presented. The experimental results reflect the effectiveness of current harmonics suppression and robustness.