Identification Of Flicker Sources

To identify the sources of power quality disturbances is a relatively critical demandof power monitoring and control. It has great significance on changing the relationshipbetween the customers and utilities and improving power quality. At present the researchon identification of flicker sources, voltage sags and so on has just begun, no efficientmethod is proposed. Until now no instrument can be used for field test.Based on the research of complex wavelet whose phase information can be used toanalyze flicker frequency and amplitude, a novel algorithm is proposed in this paper todetect the system frequency and analyzing flicker signal. A digital flicker meter isdeveloped according to the national standards for measuring the flicker level. In order toidentify flicker sources, two methods based on the correlativity of busbar voltage andload current and the direction of power flow are proposed in this paper, after analyzingthe flicker transform among different voltage levels and the characteristics of flickersource loads. Then some simulations were carried on to verify the efficiency of the twomethods. Finally, flicker source identification system is developed under LabVIEW,RTDS and field tests have been done to prove the feasibility of the system.