Aiming at the measurement error caused by non-synchronous sampling in power parameter measurement

the non-synchronous error can be effectively suppressed by averaging the intermediate signals successively in the cal-culation process.The successive average measurement theory of the mean type power parameters is studied in theform of continuous time and discrete time respectively

and the measurement error is analyzed with the help of thestandard deviation of the measurement results varying with time. Based on the fact that the weighted coefficients areequal in each recursive average process

a fast recursive algorithm for the measurement of mean type power parame-ters is proposed.The algorithm has the advantages of simple calculation and high accuracy

and the non-synchronousmeasurement error decreases exponentially with the increase of recurrence times.The recursive calculation of the volt-age RMS of a power signal with higher harmonic is simulated

and the correctness of the successive average theoryand the effectiveness of the recursive algorithm are verified.