Multirate digital power metering

This paper describes an innovative adaptive approach to the metering of power and RMS voltage and current. The metering engine adjusts the number of points per cycle to be processed and the location of these points to satisfy overall power metering error criteria while minimizing the number of points actually employed in the metering computation. This results in a reduction in the metering computational effort which frees up the processor for other tasks such a communication or power quality measurements, The algorithm has been implemented on a MOTOROLA MC68HC16-based industrial power metering system which operates under a multi-tasking operating system which exploits the efficiencies achieved by the reduced metering rate. Experimental evaluations of the system have demonstrated excellent accuracy in the metered power system quantities. This paper describes an innovative adaptive approach to the metering of power and RMS voltage and current. The metering engine adjusts the number of points per cycle to be processed and the location of these points to satisfy overall power metering error criteria while minimizing the number of points actually employed in the metering computation. This results in a reduction in the metering computational effort which frees up the processor for other tasks such a communication or power quality measurements. The algorithm has been implemented on a MOTOROLA MC68HC16-based industrial power metering system which operates under a multi-tasking operating system which exploits the efficiencies achieved by the reduced metering rate. Experimental evaluations of the system have demonstrated excellent accuracy in the metered power system quantities