A Novel Design of Digital Filter for the Measurement of Power Frequency Signal

In an electrical power system, measurement of power frequency signals such as voltage and current is of paramount importance in monitoring the system operation and protecting equipment from damage due to system faults. This paper addresses a new algorithm to calculate discrete Fourier transform(DFT). It was used to capture the power frequency signal from a distorted input, reduce the computing time of signal magnitude and angle, and also make effective use of memory resource of a microcontroller. The results of the case studies are analysed to evaluate the availability of the algorithm under the different conditions. Finally the design of hardware circuitries is also presented to illustrate how to condition the analogue input signal for the digital signal processing