摘要： Harmonic stability problems caused by the resonance of high-order ?lters in power electronic systems are ever increasing. The use of passive damping does provide a robust solution to address these issues, but at the price of reduced ef?ciency due to the presence of additional passive components. Hence, a new method is proposed in this paper to optimally design the passive damping circuit for the LCL ?lters and LCL with multituned LC traps. In short, the optimization problem reduces to the proper choice of the multisplit capacitors or inductors in the high-order ?lter. Compared to existing design procedures, the proposed method simpli?es the iterative design of the overall ?lter while ensuring the minimum resonance peak with a lower damping capacitor and a lower rated resistor. It is shown that there is only one optimal value of the damping resistor or quality factor to achieve a minimum ?lter resonance. The passive ?lters are designed, built, and validated both analytically and experimentally for veri?cation.