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Modeling and Power Transfer Characteristics of MMC-H based Solid State Transformer with Sine-Square Wave Modulation
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| Author(s) |
Yihao DU, Wenqi LIN, Shibo LIAN, Yihui ZHAO, Xiaojie FU, Yujia GUO, Jianyu PAN |
| Abstract |
Compared with traditional solid-state transformers (SSTs) with multiple dual-active bridge modules, the MMC-H based SST only requires one transformer and has high control flexibility and strong fault-tolerant capability. However, existing methods mainly adopt the square-square wave modulation technique in SSTs, rendering high dv/dt voltage stress and large harmonics. This paper takes advantage of the sine-square wave technique with MMCs to enhance the voltage and current performance. An accurate power transfer model for the MMC-H SST with the sine-square wave is proposed. The transferred power and current characteristics are revealed, and the maximum power transfer point is identified. Validated by the simulation results, the proposed model has a high accuracy with an average error of less than 3\%, and transfer current harmonics is reduced by 12\% under heavy load. |
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| Filename: | 0215-epe2023-full-17020408.pdf |
| Filesize: | 766.9 KB |
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| Type |
Members Only |
| Date |
Last modified 2023-09-24 by System |
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