基于MMC的直流变压器电流与磁通直流偏置抑制策略

This letter proposes a current and magnetic flux dc bias suppression strategy for the modular multilevel converter (MMC)-based dc transformers. With this strategy, dc bias can be suppressed within half a switching cycle under different transient conditions, including ac-link voltage amplitude, switching frequency, and phase-shift angle variation. By rearranging the moment and quantity of SMs inser...