Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 3, Pages 3403-3420Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3108877
Keywords
Modulation; Harmonic analysis; Capacitors; Pulse width modulation; Phase modulation; Voltage control; Multilevel converters; Analytical modelling; full bridge (FB) submodule (SM); harmonic spectrum; modular multilevel converter (MMC); negative-voltage states
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Funding
- U.K. EPSRC Prosperity Partnership A New Partnership in OffshoreWind [EP/R004900/1]
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This article presents a new closed-form analytical solution for analyzing the operation of a full-bridge modular multilevel converter in boost mode. The effects of modulation index, number of submodules, and upper/lower arm carrier phase shift angle on the output voltage harmonics are investigated.
This article develops a new closed-form analytical solution to the harmonic spectrum of the full-bridge (FB) modular multilevel converter (MMC) with phase shifted carrier pulse width modulation. It considers FB-MMC operation in boost mode where the negative-voltage states of the FB submodules (SMs) are utilized to extend the ac operating voltage range and/or reduce the dc link voltage which is known to reduce the energy storage requirement. The solution is based on double Fourier series expansion in two variables. The harmonic distribution of the output voltage is analyzed and the effects of the modulation index and the number of SMs on the output voltage harmonics are revealed. The influence of the upper/lower arm carrier phase shift angle is also investigated. Using the analysis, selection of the number of SMs, the modulation index and the upper/lower arm carrier phase shift angle are specified for output voltage harmonic minimization. The findings are verified by simulation and experimental results.
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