Abstract: Abstract:The fundamental of the interpolation algorithm commonused for intelligent substation was introduced. The error of the amplitude and the deviation of the phase angle of the interpolation algorithm were analyzed. The correctness of the theoretic analysis had been verified by simulation. Combining with related applications, the concrete implementation method of the algorithm was given, which provides reference for both engineering practice and theoretic research.

Key words: Key words:intelligent substation, interpolation algorithm, amplitude gain, phase angle deviation