Modular multilevel converter modulation using fundamental switching selective harmonic elimination method.
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SINHA, Y. and NAMPALLY, A. 2016. Modular multilevel converter modulation using fundamental switching selective harmonic elimination method. In Proceedings of the 5th IEEE international conference on renewable energy research and applications (ICRERA 2016), 20 -23 November 2016, Birminham, UK. New York: IEEE [online], pages 736-741. Available from: https://doi.org/10.1109/ICRERA.2016.7884431.
This paper address the issue of low order harmonics in a modular multilevel converter (MMC). Using fundamental switching selective harmonic elimination (SHE), the control angles are calculated from nonlinear equations by Newton-Raphson method. The selective harmonic elimination equations are solved in such a way that the first switching angle is used to control the magnitude of the fundamental voltage and the remaining angles are used to eliminate the lowest odd, non-triplen harmonics components as they dominate the total harmonic distortion of the converter. The concept is validated using a 9-level detailed model of MMC in PSCAD/EMTDC®. The simulation result shows a good agreement with theoretical analysis and in comparison with conventional sinusoidal pulse width modulation (SPWM), the proposed method, eliminates low order harmonics, leading to a low total harmonic distortion.