According to the problems of micro-grid quality, proposes a new type of power quality regulating device, which combinated with micro-grid energy storage unit and the active power filter, applicable to the design of two-stage converter system of the device. Gives the structure of the system, and analyses the basic working principle. The DC bus voltage predictive control with feedforward correction is used to regulate the DC bus voltage of two-stage converter. The direct power control method without the harmonic current detection is used for the control of active power filter. The device not only realizes UPS function at short-term interruptions but also suppresses the harmonics. The simulation results verify the feasibility and effectiveness of the device.