How to reduce impedance in the grounding copper busbar layout of an energy storage system PCS?

Reducing the impedance of the grounding copper busbar within the PCS cabinet is crucial for improving EMC and safety. Layout considerations:

1. Short and Thick: Use flat copper busbars with a sufficiently large cross-sectional area (calculated based on fault current) and minimize their length to reduce resistance and inductance.

2. Straight and Low-Inductance Path: Avoid bends and detours, providing a direct, low-inductance return path for high-frequency noise currents. If bends are necessary, use rounded corners instead of right angles.

3. Multiple Points and Surface Contact: Use multiple screws or solders to connect the copper busbar to the cabinet housing and equipment grounding terminals to ensure a large, tight contact area and reduce contact resistance.

4. Star or Grid Structure: For large systems, a star-shaped grounding busbar (radiating from a center point) or a grounding grid can be used to provide independent low-impedance grounding paths for different devices, avoiding common impedance coupling.