A Robust Control Method for Active Dampers Against Filter Parameter Disturbance

Active dampers are effective in suppressing the resonance of grid-connected inverters by forming a virtual resistor with precisely designed control method in high frequency band. However, the inductance parameters of the filter can shift with the variation of power or temperature, which alters the precisely controlled virtual resistor to inductive or capacitive. To deal with the reduction of resonance suppression caused by the variation of the virtual resistor, an <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$H_{\infty}$</tex> robust control method is proposed against inductance parameter disturbance. The proposed scheme's effectiveness is validated through the execution of experimental results.