Comparison of various methods for determining direction of harmonic distortion by measuring in point of common coupling

Various methods dealing with determining of harmonic distortion direction are summarized in two groups, as multi point and single point measurement. This paper presents comparison of various methods for determining direction of harmonic distortion by measurements taken in single point of common coupling (PCC). Advance methods require complete system parameters for its calculation and often unavailable tests (harmonic current injection, switching tests) for determining the values of harmonic impedances. In this paper we are dealing with methods that require only measurement of current and voltage value in PCC. Some methods are based on utility and customer impedances modeling, some on calculation of harmonic reactive power and some only on harmonic current and voltage parameters. In this paper five methods will be described and processed through measurement on the simple test system.