How should the power ground and signal ground of a power storage system PCS be separated?

In a PCS (Preinstallation System), separating power ground and signal ground is crucial for controlling noise coupling. Power ground carries high currents with high dv/dt and di/dt, resulting in high noise voltage; signal ground, on the other hand, requires cleanliness and stability to provide a reference for control circuits. The purpose of separation is to prevent noise on power ground from coupling to signal ground through common ground impedance.

Method: On the PCB layout, physically separate power ground (e.g., inverter bridge, DC-Link capacitor ground) and signal ground (e.g., control chip, sampling circuit ground) into different copper areas. Then, connect them through a single point (usually the negative terminal of the DC-Link capacitor or the grounding point of a filter) to provide a path for quiescent and low-frequency currents while blocking the propagation path of high-frequency noise. When separating, ensure that signal lines do not cross the separation gap; use bridging or isolation devices if necessary.