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Energy Balancing in the Modular Multilevel Converter under Unbalanced Grid Conditions
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| Author(s) |
Markus SCHROEDER |
| Abstract |
A comprehensive energy balancing concept for the Modular Multilevel Converter (MMC) under unbal-anced grid conditions was proposed. Grid supporting converters need to be able to fed unbalanced gridcurrents; grid failures lead to unbalanced grid voltages. Both unbalanced grid conditions generate energyunbalance inside the MMC. In order to handle these critical operating points, an analytical descriptionof the energy distribution inside the MMC - depending on the grid currents and voltages and basedon a double synchronous reference frame (DSRF) approach - was derived. The obtained mathematicalrelations were presented in a compact representation using matrix notations and an energy balancingconcept was deduced. An implementation to a hardware setup in power electronics laboratory has beenperformed. The proposed concept has been proven and verified with measurement results. |
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| Filename: | 0482-epe2017-full-17084938.pdf |
| Filesize: | 714.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2018-04-17 by System |
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