For the problem of external network estimation error caused by time differences existing between measurement sections provided by different control centers when distributed state estimation of the entire network is started

this paper proposes a correcting method for sampling errors in external network measurements based on predictor-corrector. The method can be used prior to the calculation of distributed state estimation. According to the feature that the same measuring point in the modeling overlap region of adjacent control centers may own different measurement values

the time difference between two control center measurement sections is predicted. Then the control center measurements in the external network are corrected according to the time difference

so as to ensure the state estimation correctness of the control center launching calculation(main subsystem). Finally

data on Xingtai grid is used as an example to verify the validity and performance of the method. This work is supported by National Natural Science Foundation of China(No. 51277070).