HARMONIC LOAD IDENTIFICATION AND DETERMINATION OF LOAD COMPOSITION USING A LEAST-SQUARES METHOD

Presently, the process of harmonic load identification is limited to i dentification of one load at a time since it uses measurements of volt age and current at that load bus. Given measurements of the current at any load bus that has one or more loads attached at that bus, this pa per addresses two issues. First, a simple method for identifying diffe rent types of loads on line is described. Second, a quantitative metri c that describes the contribution of each individual load type to the total load at that bus is developed (load composition). A least square s algorithm is then used to perform the task of correctly identifying different load types on line and to obtain a value for the metric that describes the individual contribution of each load type to the total load seen at that bus. This concept of harmonic load identification ca n naturally be extended to include the case of using substation measur ements.