Total harmonic power method for harmonic source detection in distribution system

Nonlinear loads are common in power systems and they cause current and voltage harmonic distortions. In power systems, harmonics are important to be considered in terms of energy efficiency and power quality. Harmonics at any point of common coupling (PCC) of a power system are generally induced by several harmonic loads. It is very important to determine the location of harmonic loads, so as to apply harmonic reduction methods to mitigate them afterwards and to let it stay within operational limits specified in international standards. In this study, analyzes were made to determine the location of harmonic loads. For this purpose, widely used Total Harmonic Active Power (THP) method has been examined, compared with the critical impedance method, and shown to give more accurate results. For the analysis, IEEE 13 bus balanced distribution test system is used. DIgSILENT Power Factory is used for harmonic power flow analysis in the test system and calculations related to THP method are performed in MATLAB.