Mixing Frequency Chain Soft Open Point

The soft open point (SOP), as a sort of promising flexible power electronic device, can improve the operating flexibility of a distribution network. However, the traditional SOP topology requires a large number of modules and passive components, which is costly and bulky. In this paper, a mixing frequency chain soft open point (MF-SOP) topology is proposed. Compared with the traditional SOP topology, this topology can reduce the number of active and passive components. The operation principle and control strategies are introduced. Then the design method of key parameters is proposed. Finally, the correctness and validity of the proposed MF-SOP are verified by RTDS simulation results.