A methodology for assessment of harmonic impact and compliance with standards for distribution systems

The new IEEE Standard 519 specifies maximum harmonic signal levels at points of common coupling to the electric utility. The authors find these standards to be applicable within industrial and institutional sites. A state estimation methodology is illustrated for the calculation of harmonic current and voltage distortion at all buses in a distribution system. It is recommended that these distortion levels are checked for compliance with Standard 519. The authors also give a calculation of the total harmonic distortion of an ideal converter current. New approximations are also introduced for the bus impedance matrix at frequency hω₀. The approximations are developed from power series expansions in either frequency, ω, or inverse complex frequency, (jω)^-1. The convergence of the series is studied in terms of Banach´s lemma