Abstract: According to the operation situation of the state estimation function of the PAS, the power application software of the Dispatch Center in Shantou Power Bureau, starting from the problems, which are encountered in daily maintenance and influencing on the calculation accuracy of the state estimation, the method to increase the calculation accuracy of the state estimation was expounded. The method is greatly helpful for increasing the calculation accuracy of the state estimation.

Key words: state estimation, power application software (PAS), fundamental, calculation accuracy, data processing