| Abstract |
This work provides an overview of all possible arm energy regulation techniques for the Modular Multilevel Converter (MMC). This research aims to identify all degrees of freedom (manipulated inputs) and possible combinations to regulate the arm energies of the MMC. Further, it offers a new generalized analytical toolchain to compare and evaluate the stability and performance of these balancing techniques. This toolchain includes normal operation, failure operation, and different three-phase and single-phase frequency conditions such as equal and unequal frequency applications (AC/AC, DC/AC). The common-mode voltage plays an essential role in regulating arm energies of the MMC for equal frequency operation. The proposed toolchain can also help to validate dimensioning of the converter analytically. Any existing energy balancing technique for MMC could be linked directly or indirectly to all derived energy balancing methods. |
