In the process of accelerating the realization of dual carbon goals and building a new power system, energy storage technology is gradually becoming one of the key technologies to support the stable operation of the new power system and optimize resource allocation. Among them, PCS (Power Conversion System) energy storage converter is the core equipment of the energy storage system, and its performance and application directly affect the overall efficiency and stability of the energy storage system.        PCS energy storage converter, full name Power Conversion System, is a key equipment in the energy storage system, used to realize energy conversion and bidirectional flow between energy storage batteries and power grids. It can convert DC power into AC power or AC power into DC power to meet the charging and discharging requirements of the power grid for the energy storage system. PCS energy storage converter plays the role of "bridge" in the energy storage system, connecting the energy storage battery and the power grid to ensure the efficient and stable operation of the energy storage system.         The working principle of PCS energy storage converter is mainly based on power electronics technology, and realizes the conversion and bidirectional flow of electric energy by controlling the on and off of switching devices. When the grid needs the energy storage system to discharge, the PCS energy storage inverter converts the DC power in the energy storage battery into AC power and outputs it to the grid; when the grid needs the energy storage system to charge, the PCS energy storage inverter converts the AC power in the grid into DC power and stores it in the energy storage battery. During the charging and discharging process, the PCS energy storage inverter also needs to perform precise power control and energy management according to the needs of the grid and the status of the energy storage battery to ensure the stable operation and efficient utilization of the energy storage system.