A Hybrid Islanding Detection Technique Using Average Rate of Voltage Change and Real Power Shift

The mainly used islanding detection techniques may be classified as active and passive techniques. Passive techniques don´t perturb the system but they have larger non-detection zones, whereas active techniques have smaller non-detection zones but they perturb the system. In this paper, a new hybrid technique is proposed to solve this problem. An average rate of voltage change (passive technique) has been used to initiate a real power shift (active technique), which changes the real power of distributed generation (DG), when the passive technique cannot have a clear discrimination between islanding and other events in the system. Simulation results show that the proposed method is effective in detecting islanding of distribution systems with DGs.