<p>Addressing the issues of uncertainties and disturbances in LCL-type grid-connected converters, a current control strategy for single-phase LCL grid-connected inverters based on linear active disturbance rejection control (LADRC) is adopted. Based on the mathematical model of the single-phase LCL grid-connected inverter, and considering that both the reference signal and disturbance signal in the grid-connected inverters are sinusoidal signals, it is known from the internal model principle that adding a resonant internal model to the controller can achieve zero steady-state error tracking of sinusoidal signals. Drawing on the idea in LADRC of compensating for total disturbances to correct the controlled object into a standard integrator form, an improved LADRC(IM-LADRC) is proposed. This method corrects the controlled object into a standard resonant form, enabling the control system to track sinusoidal signals effectively. Through simulation and experimental comparisons between LADRC and the IM-LADRC, the correctness and effectiveness of the IM-LADRC are demonstrated.</p>