Digital communication method and device for improving intelligent power grid communication reliability

The invention discloses a digital communication method and device for improving intelligent power grid communication reliability. The method includes utilizing a programmable logic controller (PLC) transceiver as the principal thing and a device capable of receiving and transmitting digital information independently and reliably as the auxiliary thing; conducting PLC physical channel estimation in a longer time period in the site mutual communication and information exchange process, wherein the estimation content includes channel performance change time varying intensity and the average communication capability; judging whether to conduct switching between a PLC and wireless communication between a transmitting and receiving pair according to the corresponding switching mechanism. According to the method, a reliable fixed wireless communication transceiver with small digital bandwidth is adopted as the reserve of a carrier communication transceiver with large bandwidth and with the physical channel performan