Passive Islanding Detection Technique for Grid-Connected Photovoltaic System
Keywords:
Anti-islanding, distributed generation, passive islanding detection, smart grid, spectral analysisAbstract
With the increased popularity of distributed generation (DG) in power systems, issues such as unintentional
islanding should be efficiently resolved. Islanding condition occurs when part of the electrical power system is
disconnected from the rest of the grid and is still energized by a DG unit. Conventional passive islanding detection
approaches utilize the power system parameters such as the change of voltage magnitude, frequency. a novel and
efficient passive islanding detection technique for grid-connected photovoltaic-based inverters is presented. In this
technique, the ripple content of the inverter output voltage at the point of common coupling is monitored for deviations
using time-domain spectral analysis. Islanding is then detected whenever the ripple spectral content exceeds a preset
threshold level for a certain period of time. The performance of this technique was extensively tested and quantified
under a wide range of operating conditions. It was determined that the proposed technique did not exhibit any nondetection zone and was able to detect all types of islanding cases within 300 ms of the allowed delay time.The
performance of this technique was extensively tested and quantified under a wide range of operating conditions. The
results are presented in this paper using Matlab/simulink).