Planning Of Solid State Transformer Considering Multiple Connection Modes And Control Methods For The Hybrid Ac/Dc Distribution Network

This paper proposes an optimal method to determine the siting and sizing of solid state transformer (SST) for the hybrid AC/DC distribution network. Considering the active power losses and multiple control methods, an equivalent model of multi-port SST was devised. In view of the multiple ports and optional installed locations of SST, a bi-level planning model was firstly established considering diverse topologies of SSTs in different locations. The upper level optimized the location and capacity of SST and the 24-hour coordinated operation of the hybrid AC/DC distribution network was optimized in the lower level. To solve the bi-level mixed-integer nonlinear problem, a parallel modified differential invasive weed optimization algorithm with the master-slave architecture was proposed. Finally, the superiority of the proposed method was validated on a 50-node hybrid AC/DC distribution network.