Aiming at the problem that multi-compensation devices work at the same time when voltage sags or interruptions occur in load-side multi-sensitive devices, which results in the interaction between devices and reduces the voltage recovery ability, a new structure of high-power dynamic voltage recovery device with centralized compensation at bus-side is proposed. The structure combines dynamic voltage restorer (DVR) with uninterruptible power system (UPS), and based on double power supply mode, by controlling the switching of islanding and grid-connected operation modes of compensation devices, the micro-grid works in three states: islanding operation mode, islanding and grid-connected mutual switching mode and grid-connected operation mode, the cross-supply of two-section buses is realized, and the reliability of sensitive loads in the micro-grid is ensured. The simulation results show that the structure can greatly improve the output capacity of the device, realize the long-term centralized compensation of voltage sag and interruption at bus side, and further improve the reliability of power supply for sensitive loads.