REAL-TIME ALGORITHMS FOR ACTIVE POWER MEASUREMENTS ON PWM-BASED ELECTRIC DRIVES

Two real-time algorithms for active power measurements on Pulse Width Modulation (PWM) electric drives are proposed, The former is an off-li ne algorithm reducing truncation error through an accurate signal peri od estimation and a proper window, The second is an on-line algorithm based on a low-pass IIR digital filter with an optimized transient pha se, Numerical results of the metrological characterization of such alg orithms, aimed to suggest criteria for their use, are presented, The e xperimental results of tests carried out on an actual drive confirm nu merical simulations and are in perfect agreement with those of a well- acclaimed algorithm.