Islanding detection and control in grid based system using wavelet transform

To detect the occurrence of islanding events as it becomes a challenging issue, the wavelet transform technique is approached. This technique has grasped to detect the appearance of islanding events in a highly effective manner. The proposed approach would serve as an efficient aid such that the mains power disconnection can be better distinguished. The islanding occurs when a portion of the distribution system becomes electrically isolated from the remainder of the power system yet continues to be energized by distribution generators. The current industry practice is to disconnect all distributed generator immediately after the occurrence of islands. To achieve such a goal, each distributed generator must be equipped with an islanding detection device, which is also called anti islanding devices. This paper proposes a wavelet based passive islanding detection scheme. This paper utilizes the discrete wavelet transform to detect the islanding contingency on grid with conventional method of voltage change and frequency change detection. Simulation results supported the effectiveness of the method for the application considered. The detection technique results indicate that the method can detect the islanding correctly and promptly.