This paper proposes a novel bus voltage control strategy based on LADRC, taking the grid-connected DC microgrid as the backdrop and the bidirectional grid-connected inverter as its research object. The PI regulation of voltage and current double closed-loop control is the standard control technique for grid-connected inverters. However, the control effect of the PI regula-tor often depends on the precision of the established system mathematical model. For the nonlinear and strongly coupled system of the grid-connected inverter, satisfactory control effects are often difficult to achieve. This paper's proposed control scheme, with its minimal voltage drop and short recovery time when confronted with DC-side power disturbances, as well as its strong anti-interference ability, is improved by the design of first-order and second-order LADRC controllers. The simulation experiment demonstrates this superiority over traditional PI control.