Islanding detection for PV plant using instantaneous power theory

Islanding detection is a distributed generation system is an important protective measure. Islanding detection is generally divided into two types, one is the active islanding detection, and the other is passive islanding detection. Islanding detection of power quality disturbance signal will always cause pollution; passive islanding detection has a long detection time and a large dead zone. Various existing detection methods have blind spots, resulting in test failure. In this paper, islanding detection blind, it raised the wavelet coefficients energy distribution and energy fluctuation coefficient analysis. Then combined with passive islanding detection, reduce or even eliminate blind spots. In this paper, MATLAB simulation and verification method proposed introduction of a device. The simulation results show that verification, islanding detection algorithm proposed in this paper has a good real-time performance, reliability and stability. The outcome can be applied to a large number of islands to detect the actual PV power plant, or micro-grid islanding detection system.