The energy storage converter (PCS) is a distributed energy storage system. It is a two-way current controllable conversion device that connects the energy storage battery system and the power grid. Its main function is to realize energy exchange between the battery and the power grid and to charge the battery: discharge control and management. In the grid-connected mode, peak shaving, peak shaving and frequency modulation, virtual capacity increase and off-grid backup of the power grid can be realized. PCS is one of the most advanced energy technologies currently available and can help achieve sustainable energy management in different industries, including residential and commercial buildings, agriculture, industry and public facilities.