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

Abstract

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

Influence of electromagnetic transient physical models considering characterization characteristics on capacitive voltage transformers

“…Gao et al scholars proposed a modular structure that can accelerate. The results showed that the acceleration model carried a larger order of magnitude while ensuring accuracy [7]. Ying et al scholars proposed an electronic transformer based on coupling capacitors, and designed a self-maintaining duty cycle circuit to achieve load and power regulation.…”

Multi-port DC-DC converter modelling

“…It is a viable option because it combines high flexibility with energy flow, provides network infrastructure, and connects DC networks to Media-Voltage (MV) and Low-Voltage (LV) networks (LV). [5]- [6]. Although additional power functions are required, the solid-state transformer (SST), primarily composed of power electronics and a highfrequency magnetic link (HFML), represents significant potential for resolving current energy-quality issues.…”

Modeling for Complex Modular Power Electronic Transformers Using Parallel Computing

“…In [13], the circuit analysis is changed to a matrix solution, and the modeling method becomes applicable for arbitrary multi-port PMs. Relying on the research of [3], [14], and [15], the method in [14] is now applicable to various kinds of multiport PM topologies and can be used for PETs and other PE equipment.…”