基于阻尼复用的逆变器拓扑重构方法用于宽带谐振抑制

ABSTRACT With the increasing penetration of power electronic devices in distribution networks, wideband harmonic resonance poses a serious threat to system stability. Conventional improvements based on a single‐inverter control strategy are insufficient to achieve wideband suppression, while additional devices introduce extra cost and power losses. To overcome these limitations, this paper proposes a damping‐reuse‐based inverter topology reconfiguration method for wideband resonance suppression. First, a unified representation based on RLC branches is established. It reveals the general influence of the auxiliary damping device on port impedance. Based on this insight, an impedance reshaping method using parallel RLC branches is proposed to enhance the port capacitance. However, passive damping devices inherently introduce energy dissipation. To address this limitation, an active module is designed to achieve an equivalent port impedance. The proposed module is integrated into existing inverter structures. Topology reconfiguration and parameter design are then performed. The proposed method effectively suppresses multimode resonance peaks. It also mitigates newly introduced resonance points associated with the auxiliary branches. As a result, wideband harmonic resonance is effectively suppressed over the entire frequency range. Theoretical analysis shows that the proposed method effectively disrupts the original resonance network. It significantly enhances system damping. Meanwhile, it avoids additional hardware cost and active power losses. Simulation and experimental results further confirm the effectiveness and general applicability of the proposed method for wideband harmonic resonance suppression.