Locking frequency band detection method for grid-tied PV inverter islanding protection

Islanding is an undesired event in which a portion of utility system containing both load and distributed resources remains energized while it is isolated from the remainder of the utility system. In case of islanding, successful detection is required to protect the equipment, and provide safety of the maintenance service workers. This paper shows an implementation of a novel algorithm named Locking Frequency Band Detection (LFBD) method on a distributed PV inverter architecture. Fast detection, easy implementation, no impact on the power quality and zero Non Detection Zone (NDZ) are among many benefits of the proposed algorithm.