Abstract:

Wind has the characteristics of stochastic intermittence (mainly including the intermittence of wind direction and wind speed). In the process of grid-connected load forecasting, the intermittence of wind speed and wind direction will have a great impact on the power grid (mainly reflected in the frequency and voltage fluctuations of the power grid), seriously affecting the stability of the power system. Based on the characteristics of micro-grid and wind power operation characteristics, the basic load model and wind power model of micro-grid are built, and the load forecasting simulation model is built with MATLAB/Simulink. The simulation results show that the wind power micro-grid can not only resist the influence of wind power integration, but also effectively reduce the peak-valley difference of the load curve of the grid. Participation of wind power micro-grid in load forecasting of power grid can effectively improve the reliability of power supply system.

Key words: micro-grid, load forecasting, grid-connected operation, Matlab/simulink, peak-valley difference