A Multi-site Information Synchronization Scheme Based on Hankel Matrix Singular Value Decomposition

[Objective] The synchronization of information in intelligent substations is of great significance for the intelligent diagnosis and protection of power system faults， of which the satellite clock synchronization method is widely used. However， the satellite clock synchronization method is dependent on dedicated communication channels or satellite synchronization clocks， which can easily lead to the loss of synchronization signals. In addition， several synchronization signal transmission channels must be installed， and damage to transmission channels will cause synchronization errors between the master and slave clocks. Information synchronization technology based on the mutation detection algorithm that does not rely on clocks and communication channels， and is not limited by synchronous communication， can effectively avoid the problem of information synchronization caused by communication. [Methods] A multiplant information synchronization scheme based on the mutation detection algorithm is proposed. It compares the performance of typical outlier detection algorithms， such as the wavelet transform and singular value decomposition， in terms of pulse width， boundary effects， and phase-shift effects. [Results] The results show that the Hankel matrix singular value decomposition algorithm has the advantages of a narrow pulse width， no influence of boundary effects， zero phase shift， and has significant advantages in fast signal singularity detection compared with wavelet transform. Accordingly， a signal synchronization scheme based on the Hankel matrix singular value decomposition algorithm was proposed. The feasibility and advantages of the proposed information synchronization scheme were verified through an analysis using a large amount of on-site recorded data. [Conclusions] The results indicate that the proposed information synchronization scheme can achieve the precise synchronization of information between various protection devices and recorders within and between plant stations.