Design of dynamic voltage restorer based on double-tuned filter

In view of problems of unstable voltage in DC side and harmonic pollution of power grid caused by dynamic voltage restorer with uncontrolled rectifier as energy storage device, a method using low-pass filter and voltage closed-loop control strategy to stabilize DC side voltage was given. Double-tuned filter paralleled before the uncontrolled rectifier to filter harmonic was proposed, so as to reduce the harmonic pollution of power grid from the energy storage device, and design principle of the double-tuned filter parameters was introduced in details. The simulation and experimental results verify rationality of the design.