The Modular Commercial and Industrial Power Conversion System (PCS) adopts a modular design with a standard 3U form factor and wide input voltage range. By precisely controlling the turn-on and turn-off of switching devices, it achieves efficient energy conversion and bidirectional flow between the energy storage battery and the grid. As a device capable of bidirectional energy conversion, it delivers high-efficiency energy conversion to reduce the operating cost of the energy storage system, precise power regulation to safeguard grid stability, seamless coordination with EMS to optimize energy management, and adaptability to diverse environments for flexible deployment across various application scenarios.