Three phase power system harmonic penetration.

Abstract

Three phase harmonic penetration software is developed and tested using measured results from the New Zealand power system. The unbalanced nature of the impedances, currents and voltages usually present in a power system is illustrated. The versatility of the algorithm to provide accurate information for studies of convertor interaction and single phase traction supplies is clearly indicated. Practical problems encountered in harmonic modelling are discussed, particularly the adequacy of available component data and the validity of models using this data. Harmonic spillover interference to load management equipment operating above fundamental power frequencies is of practical significance, and the levels of such interference for a proposed frequency change are investigated. A commitment to three phase modelling must be justified, and situations are determined where simpler single phase modelling is acceptable.