Specifies how systems must provide reactive current to support voltage during and after grid faults. 3. Protection & Control
Mandatory for systems with a maximum active power (PAmax) ≥ 135 kW. 2. Grid Connection Requirements
Includes requirements for central grid and system protection to prevent "islanding" (uncontrolled operation of a grid segment after disconnection). 4. Certification Process Summary of the draft VDE-AR-N 4110:2017-02
Requires "Fault Ride Through" (FRT) capability, meaning systems must stay connected during brief voltage dips or spikes instead of immediately shutting down.
