Applications of optimization combination model for medium-long term load forecasting

On the basis of grey theory model for medium-long term load forecasting, the paper improves the traditional grey model and brings forth the grey residual forecasting model for less prediction errors. At the same time, it uses fixed weight method of forecasting model--that is to choose weight with average precision of each model to build a optimization combination forecasting model. It forecasts with the historical load data of some area, and proofs that combination forecasting method is superior to single forecasting model, Its forecasting error is less than 1%. Finally it forecasts future five year loads of some area, and provides a tech support and theoretical foundation for area Power Company.