Electric energy quality early warning system and method thereof

The invention relates to an electric energy quality early warning system and a method thereof. The system comprises an electric energy quality monitoring and early warning subsystem and an electric energy quality evaluation and early warning subsystem. The method comprises an electric energy quality monitoring and early warning method and an electric energy quality evaluation and early warning method. According to the electric energy quality monitoring and early warning subsystem, the dynamic analysis and predication of grid electric energy quality can be realized, an electric energy quality problem can be discovered as early as possible and a preventive measure is proposed, thus the electric energy quality level of a grid is raised comprehensively. The electric energy quality evaluation and early warning subsystem can evaluate the electric energy quality before load access and evaluate the influence of grid operation, an existed problem or a potential problem is discovered in advance, early warning information is given and the corresponding prevention measure is promoted, the influence of a power transmission grid by electric energy quality disturbance is reduced, and the grid safety and economic operation levels are raised.