The PCS energy storage converter is a bidirectional power module for AC-Dc power conversion that supportsboth gridconnected mode and off-grid mode. lt can control the battery charging and discharging according toEMS instructions, perform intelligent mode switching, and adapt to large capacity cells such as 280Ah, 314Ah.and 320Ah. PCS has the functions such as overvoltage protection, overcurrent protection, overload protection,short circuit protection, over temperature protection, high/low voltage crossing, and island protection. Whencombined with STS, it can achieve seamless switching between grid connection and off-grid, which is suitablefor peak shaving and valley filling in commercial and industrial parks, responding to demand, and buildingmicrogrids with wind and photovoltaic power generation equipment and diesel generators.