Micro-current signal identification method based on single-frequency signal

The invention relates to the technical field of automation of a low-voltage power distribution network, and discloses a micro-current signal identification method based on a single-frequency signal, which comprises the following steps of: generating two pulse signals with equal frequency and an initial phase difference of 180 degrees; starting from a power frequency voltage zero crossing point, two pulse signals are switched in the positive half cycle and the negative half cycle respectively, and micro-current is output; encoding the micro current; a receiving end collects voltage and current; the voltage zero crossing point is used as a starting point, current intensity is analyzed through DFT, and micro-current is decoded; and if the decoded sequence is the same as the preset feature sequence, the micro-current identification is successful. Aiming at the problem of energy dispersion caused by the existence of two effective frequencies in a micro-current signal, a switching scheme is improved, so that signal