AN OPTIMIZATION-BASED TECHNIQUE FOR POWER-SYSTEM HARMONIC FILTER DESIGN

This paper presents a novel optimization design technique for power sy stem shunt filters to ensure harmonic reduction and noise mitigation o n the electrical utility grid. The proposed filter design is based on the minimization of a composite objective function depicting the three main filter objectives of minimum harmonic current penetration into t he electric grid system, maximum current absorption by the harmonic fi lter and minimum harmonic voltage distortion at points of common coupl ing. In addition to these objectives, near-parallel resonance conditio ns on the combined system/filter configuration are to be avoided. Good knowledge of the driving-point system impedance (measured or estimate d) range, or the actual fitted frequency domain transfer function, is essential for designing the most cost-effective filters to reduce domi nant harmonics in the specified frequency range. Both continuous and d iscrete type constraints can be included in the filter parameter estim ation. The min-max optimization is performed over a specified set of d iscrete dominant offending harmonics.