Research on control strategy of double closed-loop single-phase photovoltaic inverter based on error compensation LADRC

In the field of photovoltaic power generation control, the control of photovoltaic inverters is an important part. Traditional PI and other linearization control methods do not consider the nonlinear characteristics of photovoltaic inverter systems, resulting in poor dynamic and static performance and robustness of inverters. This paper proposes a double closed-loop control strategy combining error compensation linear active disturbance rejection controller (LADRC) and PI control. In order to avoid the oscillation of the photovoltaic inverter system and improve the stability of the system, the output error compensation term is added to the LADRC control in the linear state error feedback control law, it is applied to the double closed-loop control of the voltage outer loop, and the current inner loop adopts PI control. Realize the control of single-phase photovoltaic inverter system. A 1.5 kW single-phase photovoltaic inverter system model is established in MATLAB/Simulink. The simulation results show that the single-phase photovoltaic inverter system with error compensation LADRC-PI double closed-loop control has good stability, fast response speed, good dynamic and static performance and robustness.