How to suppress lightning-induced overvoltage in a PCS energy storage system?

The PCS system's suppression of lightning-induced overvoltages primarily targets transient overvoltages induced by nearby lightning strikes on long cables (such as power grid lines and communication lines). Suppression measures are multi-layered:

1. Port SPD installation: Install appropriate surge protection devices at the power and signal line entrances. For example, use MOVs (such as the 14D series) or GDTs for power lines, and low-capacitance TVS diodes or semiconductor discharge tubes (TSS) for signal lines. This is the most direct energy absorption and voltage clamping method.

2. Good shielding and grounding: All incoming and outgoing cables use shielding layers and are grounded at both ends, providing a low-impedance shielding return path for induced currents and reducing the energy coupled into the core wires. The cabinet itself should also be well grounded.

3. Line filtering: After the SPD, use filters such as common-mode inductors to further attenuate high-frequency oscillation components that are not completely absorbed by the SPD. 4. Internal circuit protection: Add TVS or filtering circuits to the power and signal pins of critical chips as a last line of defense.