In the field of photovoltaic (PV) power generation control

inverter control plays a crucial role. In dual-loop control strategies

linear control methods such as proportional-integral (PI) control are widely used in the outer voltage loop and inner current loop. However

traditional PI and other linear control methods do not consider the nonlinear characteristics of PV inverter systems

resulting in poor dynamic and static performance and robustness. This paper proposes a dual-loop control strategy combining an improved linear active disturbance rejection controller (LADRC) with PI control. To avoid oscillations in the PV inverter system and improve system stability

an improved LADRC is designed by adding an output error compensation term to the linear state error feedback control law

and is applied to the outer voltage loop

while PI control is used in the inner current loop. After parameter tuning and controller performance analysis

it realizes the control on a 1.2 kW single-phase PV inverter system. The system is modelled and simulated in Matlab/Simulink to analyze the influence of the improved LADRC-PI control strategy on single-phase photovoltaic inverter performance. Simulation results show that compared with the traditional dual-loop PI control

the improved LADRC-PI dual-loop control has better system stability

faster response speed

and the improved dynamic and static performance and robustness.