Hybrid Islanding Detection Method based on ROCOF over Reactive Power and d-Axis Current Injection

Abstract

On the occurrence of an unintentional islanding in an inverter-based DG system, an effective islanding detection method is mandatory to ensure safe operation of loads in the system. This work proposes a hybrid islanding detection method (IDM) which combines a passive and an active IDM for a rapid, secure and dependable islanding detection. ROCOF over reactive power is employed as the passive IDM which enables the active IDM, where injection of d-axis disturbance current to analyse d-axis voltage component at the point of common coupling (PCC) takes place on a standard UL1741 test configuration. MATLAB/SIMULINK is the simulation platform employed to validate the proposed hybrid method. An FPGA based NI LabView PXI with SbRio 9606 interface hardware setup is employed for the hardware validation of the proposed work.