How can the power circuit of a power storage system (PCS) suppress common-mode noise?

The high dv/dt generated by the fast switching of the PCS inverter bridge produces displacement current through the parasitic capacitance between the power devices and the heatsink, forming common-mode noise. The key to suppression lies in blocking its conduction path and absorbing energy. Connecting a common-mode inductor in series on the AC output side is crucial, as it provides high impedance at high frequencies to impede the flow of common-mode current. Depending on the power rating, CM-L or CM-Z series common-mode inductors can be selected, effectively attenuating noise through the common-mode rejection effect of their cores. Simultaneously, optimizing the drive to reduce the switching voltage change rate and connecting a Y capacitor in parallel between the DC bus and the chassis provide a legitimate high-frequency return path for common-mode noise, thereby significantly reducing interference to the power grid.