Real time measurement of power disturbances: Part 1. Survey and a novel complex filter approach

The accurate and real time measurement of power disturbance is a key element of protection, control, fault diagnosis, power quality monitoring and power metering in electric power systems. This paper proposes three criteria for selecting or developing an appropriate measurement technique and, based on these criteria, the performance of the measurement techniques in common use or newly developed are analysed. A novel complex filter and the associated recursive algorithm are further presented in this paper, which achieve both high measurement accuracy in all service conditions and low computational complexity. The potential applications of the proposed method are also addressed briefly, its effectiveness and superiority are ascertained in Part 2 of the series using both simulated and practical power disturbance waveforms.