PCS energy storage and step-up transformer integrated system includes energy conversion system and step-up transformer system. Its function is to provide energy conversion between the energy storage battery and the power grid. The container-type energy storage system can effectively solve the volatility and randomness of wind and other new energy power generation, improve the power quality of the power grid, improve the utilization rate of renewable energy, and help achieve carbon peak and carbon neutrality. The container-type energy storage system has the advantages of large capacity, strong flexibility, strong reliability, strong scalability, convenient installation, lifting and unloading, and strong adaptability to the environment. Compared with the traditional energy storage power station, the container-type energy storage system also has the characteristics of beautiful appearance, simple debugging, low cost, and is especially suitable for the off-grid energy storage requirements in complex and harsh environments such as high altitude, cold, seaside, desert, etc.