【SMM analysis】Power conversion system (PCS) is a part of energy storage system that converts direct current (DC) to alternating current (AC) and interacts with the grid or load. Technically, PCS can be further classified into centralized inverters, string inverters, distributed inverters, and micro inverters. At present, the large-scale energy storage systems in the industry mainly adopt centralized PCS. However, through cluster management, string PCS can enhance the system life and the discharge capacity over its entire life cycle, and the trend of its large-scale application has begun to take shape.