Title :
Real-time algorithms for active power measurements on PWM-based electric drives
Author :
Arpaia, Pasquale ; Avallone, Franceso ; Baccigalupi, Aldo ; De Capua, Claudio
Author_Institution :
Dipartimento di Ingegneria Elettrica, Naples Univ., Italy
fDate :
4/1/1996 12:00:00 AM
Abstract :
Two real-time algorithms for active power measurements on Pulse Width Modulation (PWM) electric drives are proposed. The former is an off-line algorithm reducing truncation error through an accurate signal period estimation and a proper window. The second is an on-line algorithm based on a low-pass IIR digital filter with an optimized transient phase. Numerical results of the metrological characterization of such algorithms, aimed to suggest criteria for their use, are presented. The experimental results of tests carried out on an actual drive confirm numerical simulations and are in perfect agreement with those of a well-acclaimed algorithm
Keywords :
IIR filters; PWM invertors; error detection codes; motor drives; power engineering computing; power measurement; power system harmonics; recursive estimation; recursive filters; signal sampling; synchronisation; variable speed drives; PWM-based electric drives; accurate signal period estimation; active power measurements; forced voltage PWM invertor; low-pass IIR digital filter; metrological characterization; numerical simulations; off-line algorithm; on-line algorithm; optimized transient phase; quasisynchronous sampling; real-time algorithms; recursive implementation; three-phase variable speed drive; truncation error reduction; zero crossings; Distortion measurement; Electric variables measurement; Finite wordlength effects; Frequency; Power harmonic filters; Power measurement; Power system harmonics; Pulse measurements; Pulse width modulation; Sampling methods;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
