A new high-speed and high accuracy measurement method for power grid

A new high-speed and high accuracy measurement method for power grid is invented. The new method employs recursive discrete architecture to transform the measurands from time domain to frequency domain, followed by a new measurement method to calculate the frequency of measurands recursively at a rate of sampling rate of measurands using the frequency domain data. The recursive measurement method has extremely low computational complexity while maintain high level of measurement accuracies. Further, the recursive method can be also applied to calculate the rate of change of frequency at a rate of sampling rate of measurands. Without sacrificing measurement accuracies, the method allows high-speed grid measurements, or low-speed grid measurements with minimum computational resources.

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