Key Technologies for Energy Storage System Network Control

This document discusses key technologies for network control of energy storage systems, focusing on large-scale converter parallel centralized synchronous network construction. It highlights typical application scenarios including main network voltage and frequency support, distribution network active support, and independent system voltage and frequency construction. The document addresses challenges such as transient behavior under grid faults, current limiting mode issues, and the need for voltage source characteristics akin to synchronous machines. Innovative work includes a centralized synchronous network control approach that directly collects high-voltage side signals to shape synchronous network construction characteristics, enabling plug-and-play and hot-swappable capabilities. A hardware-in-the-loop test platform for 16 parallel converters demonstrates a centralized network controller response speed of about 300μs, verifying simultaneous black start and module hot-swapping functions.