A new secure method for the transmission of protection information between substations based on compressed sensing

Wide-Area protection uses the global information to detect faults and to achieve stability control, which is a hot research topic nowadays. However, wide-area protection system needs to use information from a number of substations. Therefore, communication´s reliability requirement is high. To ensure reliability of the information transmitted between substations, this paper presents an encoding method based on compressed sensing (CS). This method creates sparsity for the data to be transferred and maps the information to the frequency domain before transmission. At the receiving end, an orthogonal matching pursuit (OMP) reconstruction algorithm is used to reconstruct the original information. The simulation results show that even with the worst case bit change, or when the communication channel has noise, the normalized root mean square error (NMRSE) is still acceptable. The method simplifies the encoding and decoding complexity, greatly improves efficiency.