In this paper

four evaluation indexes are proposed to represent the relation between four types of reactive and active power load by way of reactive power load classification of 220 V regional power network. A kind of method of reactive power load predication is proposed based on the stability characteristic of reactive power load index in the same operational mode. The heavy load region and region with power supply of grid is selected typical calulation example. It is shown by the result that each proposed index can reflect the difference of reactive power load distribution feature of different regionas at different operation mode. The reactive power load of 2014 is predicted by the use of reactive power load index of six regional grid at 220 kV during 2011 to 2013 in summer mode. The error analysis of prediction results and the actual reactive power load is made. It is shown by the result that the proposed prediction method has good prediction result

which provides strong data support to the reactive power optimization planning.