Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

State-Space Modelling and Stability Analysis of Solid-State Transformers for Resilient Distribution Systems

Version 1 : Received: 27 December 2023 / Approved: 28 December 2023 / Online: 28 December 2023 (11:23:33 CET)

A peer-reviewed article of this Preprint also exists.

Mishra, D.K.; Abbasi, M.H.; Eskandari, M.; Paudel, S.; Sahu, S.K.; Zhang, J.; Li, L. State–Space Modelling and Stability Analysis of Solid-State Transformers for Resilient Distribution Systems. Appl. Sci. 2024, 14, 1915. Mishra, D.K.; Abbasi, M.H.; Eskandari, M.; Paudel, S.; Sahu, S.K.; Zhang, J.; Li, L. State–Space Modelling and Stability Analysis of Solid-State Transformers for Resilient Distribution Systems. Appl. Sci. 2024, 14, 1915.

Abstract

Solid-state transformer (SST) is a promising technology for smart grids due to its flexible power control (better reliability) and high efficacy (by decreasing losses) compared with traditional transformers. The SST is designed in tandem with three stages, i.e., the input, isolation, and output stages. As three converter stages are used to design the SST to make a more reliable device in practice, it is highly prone to instabilities. Moreover, the key objective of SST design is to implement a modern power distribution system to make it more intelligent and reliable. The stability issue can be even more complicated by the presence of distributed energy resources in the distribution system. Thus, the stability of SST must be measured prior to /during the design, and to determine, a state-space model is used, which is developed in this paper. Each stage of SST is modeled with its controller, and the system's stability is measured through the controllability and observability test. Further, the conversion from state-space to transfer function model is done, and the stability of SST is shown using frequency and time-domain diagrams. With these, the different plots, namely, the Bode plot, Nyquist plot, Nichols chart, Root locus, pole-zero plot, and Eigen plot, are used to ascertain the relative and absolute stability. Finally, the SST Simulink model is tested and validated through hardwate-in-the-loop simulation, i.e., OPALRT, to show its effectiveness and applicability.

Keywords

solid-state transformer; smart grid; stability analysis; state space model; resilience 

Subject

Engineering, Electrical and Electronic Engineering

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.