To solve the demand for long-term and complex compensation for voltage quality problems, a kind of active power injection voltage quality compensation device is proposed. A PWM rectifier is used to provide voltage support for the DC bus of the device, so that the device can effectively compensate for long-term voltage quality disturbance. An algorithm based on instantaneous reactive power theory is used to detect the voltage quality disturbance. The compensation strategy based on the minimum voltage injection method and piecewise compensation logic is adopted, and the composite voltage quality compensation control strategy is proposed. This can realize the multi-objective compensation of voltage sag, swell, harmonic and undervoltage. In PSCAD/EMTDC, the proposed main circuit topology and compensation control strategy are simulated and verified. The simulation results show that the proposed device can realize the long-term compensation and compound compensation for the voltage quality problem, and the main circuit topology and compensation control strategy are feasible and effective. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2015AA050104) and Science and Technology Project of the Headquarter of State Grid Corporation of China (No. SGHB0000KXJS1800411).