Abstract: For the seasonal power load forecasting with the double trends of increasing and fluctuating,it is proposed first for the combined optimum gray neural network model of seasonal load forecasting We study the problem of complex seasonal load forecasting with double nonlinear trends The optimum model is better than the tow load forecasting models with one development trend An application case of the power load forecasting is given We provide a new and effective method for the seasonal power load forecasting.

Key words: power load forecasting, seasonal load, combined gray ANN, double trends