Conclusion This paper presents a new solution for microgrid inverters interms of circuit topology and control structure. The combined three-phase four-wire inverter, which is composed of three single-phase full-bridge inverter circuits, is adopted. The control structure is divided into three main parts: the is landing detection unit, thegrid-connected controller, and the is landing controller. The inver-ters automatically operate in the grid-connected or the is landing mode using the is landing detection unit. In the grid-connected mode, the controller is composed of the sliding-mode current inner loop and the constant power control outer loop. The inverter effectively rejects the grid voltage disturbances and the param-eter uncertainties. Moreover, the inverter also provides constant currents to the grid. In the is landing mode, the controller is based on the sliding-mode voltage inner loop, the virtual resistive output-impedance loop, and the improved P/Q sharing control loop. The controller guarantees the parallel operation of the micro-grid inverts with robustness performance and a good power sharing accuracy. The dynamic characteristics and the high disturb-ance rejection performance during the transition is ensured. The theoretical analysis and test results validate the proposed control strategy effectiveness.