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Harmonics, inter-harmonics in power system distorts grid voltage, reduces power quality, affects the security of power grid. Rapid and accurate harmonics separation from grid voltage is the key technology to ensure power system operates safely and stably. Blind Source Separation(BSS) method based on Independent Component Analysis(ICA) is used to separate the different kinds of components in grid voltage. Grid voltage contained with harmonics is acquired in only single channel, and harmonics separation from grid voltage belongs to single channel ICA problem, which is extreme undetermined ICA problem. In order to solve this puzzle, a new method for harmonics separation from single channel grid voltage, which combines EEMD, FastICA and SVD method has been proposed in this paper.