NS protection and grid monitoring

Decentralized energy generation systems, such as battery storage systems, supply electricity to the power grid. To maintain grid stability, the feed-in process must be carefully controlled to ensure consistent frequency and voltage quality.

Each decentralized energy generation system requires grid and system protection, known as NS (Network Support) protection or NA Schutz protection. NS protection ensures that the BESS operates safely within grid regulations, preventing disturbances such as overvoltage, undervoltage, or frequency imbalances. It plays a crucial role in maintaining grid reliability by detecting and responding to abnormal grid conditions, disconnecting the BESS if necessary to avoid damage or instability.

The inverters inside the rack are configured to comply with country- or region-specific grid codes, including response to over- or under-frequency events. However, full compliance requires an external NS protection relay (NA Schutz relay) at the system level. This relay continuously monitors grid conditions and provides an additional layer of safety by ensuring that the entire system, regardless of the number of BAT-80 AC units, meets grid protection requirements. Even in a multi-unit setup, a single monitoring unit is sufficient to ensure proper grid protection and network support functionality.

For more information about NA Schutz requirements, approved components, and configuration guidelines, refer to the NS Protection Reference Manual: https://doc.servicex.dk/xolta/grid-protection/installation-manual/global/en-us/default.htm.