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Pengfan Xu,Yue Wang,Taiyuan Yin,Shiyuan Yin,Zhang Wang,Kai Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
With the development of new energy sources, more and more isolated islands are interconnected to grid through MMC. However, isolated islands systems are easily influenced by harmonic disturbances. The analytical analysis of the harmonic transfer characteristics between AC/DC side of the Modular Multilevel Converter (MMC) is of great significance for understanding the harmonic issues and stability analysis. In this paper, the quantitative analysis method of the harmonics on the DC-side excited by the AC-side harmonics of MMC is presented in this paper. First, the influence of harmonics on MMC electric system and control system is analyzed. Second, the equivalent MMC harmonic transfer model is established based on the average switching function. Finally, the analytical expression of DC-side harmonic transferred from AC-side is derived. A 232-level simulation model was built in MATLAB/Simulink. The accuracy and validity of the proposed analytical expression were verified by comparing the simulation results with the analytical results.