A Theoretical and Experimental Analysis of N+1 and 2N+1 Phase-Shifted Carrier-Based PWM Strategies in Modular Multilevel Converters

Conference: PCIM Europe 2014 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/20/2014 - 05/22/2014 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2014

Pages: 8Language: englishTyp: PDF

Personal VDE Members are entitled to a 10% discount on this title

Liu, Xudan; Lindemann, Andreas; Amiri, Hadi (Otto-von-Guericke Universitaet Magdeburg, Magdeburg, Germany)

This paper presents a detailed theoretical and experimental analysis of N + 1 and 2N + 1 phase-shifted carrier-based PWM strategies (PSPWM) in modular multilevel converters (MMC). The reason why N + 1 and 2N + 1 voltage levels can be generated with different shifted phase angles and sub-module numbers is explained via theoretical analysis, and the harmonic contents of different PWM strategies are analyzed and compared by analytical double Fourier analysis method. To verify the validity of the above analysis, inverter models were built in MATLAB/Simulink. Moreover, a small-scale prototype has been developed so as to provide detail experimental results.