A Novel Synchronous Time Error Correction Method for Distribution Network Equipment

In this paper, a novel synchronous time error correction method is proposed for the distribution network equipment. According to the principle of time synchronization of distribution network equipment, the time synchronization error is analyzed between the station concentrator equipment and the distribution network equipment. Considering the influence of the uncertainty of the communication delay between the station concentrator and the distribution network equipment, the synchronization time of the distribution network equipment is employed to establish the time synchronization error matrix between each equipment. For filtering out the abnormal data of the error matrix, the multi-dimensional scaling (MDS) method and local outlier factor (LOF) method are utilized. Then, a corrected time synchronization error matrix is built without the corresponding data of the abnormal equipment. According to the corrected error matrix, the synchronization error of distribution network equipment is calculated, and the corrected synchronization time is defined for distribution network equipment. Simulation shows that the proposed method can achieve the filtering of abnormal data of synchronization error and reduce the impact of communication delay uncertainty on time synchronization.