Application of the Moving Average Filter for the Tasks of Electrical Power Parameters Measurement

The moving average filter is a popular filter for digital signal processing applications. This filter characterizes several advantages. The recursive approach makes it easy to implement in practice. The frequency response contains a number of frequencies (notch frequencies) for which its value is equal to zero. The disadvantages of this filter are associated with the unevenness of the passband and the presence of so-called "petals" in the stopband. Moving average filters (MAF) are actively used in the tasks of measuring such parameters of electrical power as root mean square value, apparent power, active power, reactive power. The paper proposes a number of modifications that make it possible to increase the efficiency of using MAF in the problems being solved. Analytical expressions are obtained that allows to estimate the measurement error of the required parameter caused by the nonideal filter. Approaches are proposed that allow both to reduce the passband attenuation and to increase the stopband rejection. The effectiveness of the obtained modifications is confirmed by the results of simulation modeling performed in Matlab.