Performance analysis of a new fast negative sequence power injection oriented islanding detection technique for photovoltaic photovoltaic based voltage source converter based micro grid operation

This study presents a new study on islanding detection method for photovoltaic (PV) based voltage source converter (VSC) system incorporated with multiple distributed energy resources-based microgrid. The VSC system is basically controlled by positive sequence power-voltage loop, where dc-link capacitor voltage and point of common coupling power components are measured parameters. During grid disconnection an islanding detection loop is further implemented with existing control, based on negative sequence active and reactive powers of coupling bus. The threshold for the feedback sequence voltage is determined to maintain a negligible non-detection zone and to avoid false detection during other power quality issues. A binary tree classifier is adopted for threshold filter design to perturb disturbance parameters only during islanding events. Worst-case scenario is considered by implementing a PV-based VSC system from IEEE UL 1741 standard. The performance of the proposed islanding detection technique is investigated in MATLAB/ Simulink environment. The efficient detection of islanding with a fast run on time is ensured by the result analysis, where no significant effect in power quality during normal operating condition has been maintained.