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A complete solution to the harmonic elimination problem

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4 Author(s)
J. N. Chiasson ; Electr. & Comput. Eng. Dept., Univ. of Tennessee, Knoxville, TN, USA ; L. M. Tolbert ; K. J. McKenzie ; Zhong Du

The problem of eliminating harmonics in a switching converter is considered. That is, given a desired fundamental output voltage, the problem is to find the switching times (angles) that produce the fundamental while not generating specifically chosen harmonics. In contrast to the well known work of Patel and Hoft and others, here all possible solutions to the problem are found. This is done by first converting the transcendental equations that specify the harmonic elimination problem into an equivalent set of polynomial equations. Then, using the mathematical theory of resultants, all solutions to this equivalent problem can be found. In particular, it is shown that there are new solutions that have not been previously reported in the literature. The complete solutions for both unipolar and bipolar switching patterns to eliminate the fifth and seventh harmonics are given. Finally, the unipolar case is again considered where the fifth, seventh, 11th, and 13th harmonics are eliminated along with corroborative experimental results.

Published in:

IEEE Transactions on Power Electronics  (Volume:19 ,  Issue: 2 )