The micro-grid islanding detection based on the principle of impedance voltage divider

The micro-grid is a kind of special form of active power distribution network, it provides a kind of effective method of the control of the distributed power for large-scale, and it is the beneficial supplement of the power grid. The power grid can run on the two conditions of parallel grid and islanding, and electricity can be absorbed by it from grid or provide grid with electricity when the condition of parallel grid; When the events of main power quality occur, the power grid can run separately from the main from. To test the transformation of two kinds of states fast and accurately, this paper introduces a kind of test methods of islanding based on the principle of impedance points pressure, and this detection circuit model of the micro-grid islanding is simulated by the software of MATLAB/Simulink, and the simulation results show that the islanding detection method does achieve the effect of the micro-grid islanding detection.