Research on Repeated Control Integral Antisaturation Strategy Based on Model Recovery in Three-phase Inverter

As the key interface equipment between the power grid and the user in the distributed energy, the performance of the three-phase inverter plays a crucial role in ensuring the safe, stable, efficient and intelligent operation of the microgrid and the main grid. Affected by the three-phase load imbalance and the nonlinear components of the inverter itself, current harmonics will be introduced in the process of AC network access or load use, causing grid pollution, increasing line losses, affecting the service life of transformers, capacitors and loads in the line. In this paper, Model Recovery Anti-windup (MRAW) strategy is introduced on the basis of traditional repetitive controller to solve the shortcoming of slow dynamic response of repetitive controller. The repetitive control integral anti-saturation strategy based on model recovery not only achieves the steady-state tracking performance, eliminates harmonics and has fast dynamic response speed, so as to effectively improve the grid-connected power quality of three-phase inverters.