The stored energy require-ments for the MMC topologies is 40 J/kVA, according to . Therefore, the energy storage is 40,000 J and 45.5 J for capacitor and inductor, respectively. The number of semiconductors is smaller for the 2 L con-verter. The MMC presented higher number of semiconduc-tors due to the various cells.
The analysis of the losses associ-ated to the isolation transformer in the MMC converter (MMC + ITx) shows that it is two times higher than the MMC directly connected to the grid, which demon-strates the impact of the use of a connection transformer.
The converter topologies in each stage are classi-fied in topologies with transformer or transformerless. If low voltage switches are employed in the dc/ac stage for two or three level topologies, a step-up transformer is required to connected the BESS to the MV grid .
It can be concluded that, although the two-level and three-level topologies present a step-up transformer for the con-nection with the medium voltage grid, which means higher losses, they are still preferable due to their physical and con-trol simplicity if compared with the MMC topologies.
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The connection of these sys-and wind electricity generation, among other alternatives, tems in MV grids can contribute with various services, account for a significant part of the electric power gener- such as peak shaving, time shifting and spinning reserve ation matrix all around the world. However, in this sce- [4, 5].
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Several power converter topologies can be employed to connect BESS to the grid. There is no defined and standardized solution, especially for medium voltage applications. This work aims to carry...
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Several power converter topologies can be employed to connect BESS to the grid. There is no defined and standardized solution, especially for medium voltage applications. This work aims to carry...
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