Accelerated Electromagnetic Transient (EMT) Equivalent Model of Solid-State Transformer

Accurate and efficient electromagnetic transient (EMT) simulation of various types solid-state transformers (SSTs) is extremely time-consuming due to the complex module structure, flexible topology connections, large number electrical nodes, time steps limited in range microseconds. Therefore, it urgent develop EMT equivalent modeling fast SSTs for system-level studies. Taking modular multilevel converter (MMC)-based SST as an example, this article proposes accelerated model, which focuses on equivalence dual-active-bridge (DAB)-based high-frequency link (HFL) SST. Compared with existing algorithms, two critical factors proposed method that contribute most efficiency improvement are preprocessing nodal admittance equation conversion short-circuit parameters. The model verified PSCAD/EMTDC by comparing detailed model. results show one-to-two orders magnitude faster than without sacrificing accuracy. experiment validation also confirms validity