ITERATIVE METHODS FOR THE EVALUATION OF CURRENT HARMONICS PRODUCED BY MULTIPLE STATIC CONVERTERS

摘要

This paper presents a method for effective evaluation of current harmonics produced by multiple ac/dc static power converters. The calculation of harmonics is carried out using switching functions and considering interaction among converters. To evaluate the amplitude of the resultant current harmonics injected in the ac network, an optimization method proceeds through a few iterations until the ac side voltage harmonics converge to a steady state. Four optimization algorithms are compared and their ability to satisfy fast convergence, accuracy of current harmonic evaluation, robustness, sampling frequency and computational complexity are examined. These are Quasi-Newton, Gauss-Newton, Levenberg-Marquardt and Large Scale Thrust Region Reflective Newton. Simulation results obtained from Power System Blockset show the effectiveness of the proposed methods.