Performance of multiple passive islanding detection technique for synchronous type of DG

Abstract

Placing DG closer to the load in the system can improve the grid reliability and power quality, however it can lead to some technical issues such as islanding which requires attention from utility and Independent Power Producer (IPP). One of the important issues in power system distribution is islanding detection for protecting the DG when islanding operation occurred. The detection technique is employed so that the islanding event can be detected within the time frame. The main reason of detecting islanding situation at distribution level is to monitor the DG output or system parameters thus can determine the occurrence of islanding situation from the change of these parameters. Therefore, this paper presents the performance of multiple parameters of passive islanding detection technique in distribution system connected with synchronous type of DG. Sixteen passive parameters including rate of change of frequency (df/dt), rate of change of voltage (dv/dt), rate of change of active power (dp/dt), and rate of change of reactive power (dq/dt) are evaluated. The sensitivity analysis of these parameters are determined via simulation in terms of variation of loads, fault events and load switching on various events that are islanding and non-islanding events. The analysis indicates that each parameter displays a different pattern of sensitivity towards islanding event.