Research on Active Disturbance Rejection Based on New Single-Stage Buck-Boost Inverter

In view of the problem that the traditional inverter can't realize the function of lifting voltage and the DC side needs large electrolytic capacitance, a new type of single stage Buck-Boost inverter without electrolytic capacitance is proposed. Based on this, the PR controller and ADRC based on the new inverter are designed. Firstly, the main topology structure of the new inverter is analyzed and its mathematical model is established. Secondly, the characteristics of nonlinear ADRC are introduced. The internal and external disturbances are used as total disturbances, the object states are estimated and controlled and compensated, and the parameter tuning method is given. Through simulation, compared with traditional PR control, it is verified that ADRC can control photovoltaic inverter more effectively and improve the anti-interference ability and robustness of the system.