PR and harmonic compensation control scheme with current state feedback for an single-phase Active Voltage Quality Regulator

In this paper, a new control scheme of a proportional resonant (PR) + harmonic compensation (HC) combined with inductor current state feedback and load current feed-forward for an Active Voltage Quality Regulator is proposed. The inductor current state feedback is used to enhance the stability and increase the damping factor to eliminate the resonant peak of output LC filter. The load current feed forward is implemented to compensate the voltage drop due to the inductor state feedback and suppress the load disturbance. Meanwhile, a combined PR and HC control structure is added into the outer voltage regulation loop to achieve zero steady-state error and compensate harmonics respectively. Theoretical analysis has been achieved and the analytical results are validated by simulation studies and experimental tests on a single-phase 2kVA prototype, which verify the feasibility and effectiveness of the proposed controller.