High-bandwidth Control Structure for Solid-State-Transformers with EtherCAT Protocol
- Authors
- Kim, DongUk; Lee, Jaehong; Lee, Seung-Hwan; Kim, Sungmin
- Issue Date
- May-2023
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- controller; EtherCAT; high-voltage isolation; solid state transformer
- Citation
- 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia), pp 1843 - 1848
- Pages
- 6
- Indexed
- SCOPUS
- Journal Title
- 2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)
- Start Page
- 1843
- End Page
- 1848
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/117950
- DOI
- 10.23919/ICPE2023-ECCEAsia54778.2023.10213674
- ISSN
- 0000-0000
- Abstract
- This paper proposes a high-bandwidth control structure for solid-state-transformers (SSTs). To fabricate a medium-voltage (MV, 25 kVrms) SST, a 42-level AC/DC rectifier and forty-two dual-active-bridge (DAB) converters are required. However, it is challenging to simultaneously control these converters due to synchronization, propagation delay, and complexity. In this paper, an optimized structure for MV high-level SST controller is proposed. An industrial EtherCAT master PC and state-of-the-art micro-control-units (MCUs) TMS320F28388D are employed to fabricate the control environment. Using the serial-peripheral-interface (SPI) and EtherCAT protocols, a 10 kHz bandwidth data communication between controllers was achieved within a 100 μs delay. Based on the fast communication environment, a partially decentralized voltage balance control scheme, which reduces communication data size, is presented. The proposed controller is evaluated with a PLECS simulation model of the 42-level SST system. © 2023 The Korean Institute of Power Electronics.
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