volume | PIER Journals

Abstract

Solid State Transformers (SSTs) are emerging as the major component of smart grid system. High Frequency Transformer (HFT) is the key element of SST. The optimum design of SST is a critical task due to the complex design of magnetic, electric and dielectric circuits of high frequency transformer and due to the design of power electronic circuits used at either sides of HFT. The most significant among above is the design of magnetic circuit and the possibility of using different magnetic materials for high frequency application. This paper discusses the performance analysis of HFT for different magnetic materials used for core construction. The magnetic materials considered in this analysis are amorphous, nanocrystalline and si-steel. Optimum HFT design is selected from a set of designs using an iterative algorithm, considering each core material separately. Validation of the design is done in Finite Element Method (FEM) analysis software. The design of a high frequency transformer, which is integrated in 1000 kVA 11 kV/415 V SST, is investigated both analytically and numerically, with optimum designs developed using three core materials.

1. Wang, Q., J. Qu, B. Wang, P. Wang, and T. Yang, "Green technology innovation development in China in 1990-2015," Science of The Total Environment, Vol. 696, 134008, ISSN 0048-9697, 2019, https://doi.org/10.1016/j.scitotenv.2019.134008.
doi:10.1016/j.scitotenv.2019.134008

2. Gao, K., Y. Huang, A. Sadollah, et al. "A review of energy-efficient scheduling in intelligent production systems," Complex Intell. Syst., Vol. 6, 237-249, 2020, https://doi.org/10.1007/s40747019-00122-6.
doi:10.1007/s40747-019-00122-6

3. Sorrell, S., "Reducing energy demand: A review of issues, challenges and approaches," Renewable and Sustainable Energy Reviews, Vol. 47, 74-82, ISSN 1364-0321, 2015, https://doi.org/10.1016/j.rser.2015.03.002.
doi:10.1016/j.rser.2015.03.002

4. Sato, T., D. M. Kammen, B. Duan, M. Macuha, Z. Zhou, J. Wu, M. Tariq, and S. A. Asfaw, "Smart grid standards: Specifications, requirements, and technologies,", ISBN: 978-1-118-65369-2.

5. Hossain, R., M. Amanullah, T. O. Aman, and A. Shawkat, Smart Grid, 2013, 10.1007/978-1-4471-5210-1_2.

6. Shadfar, H., G. P. Mehrdad, and A. F. Asghar, "Solid-state transformers: An overview of the concept, topology, and its applications in the smart grid," International Transactions on Electrical Energy Systems, Vol. 31, 2021, 10.1002/2050-7038.12996.
doi:10.1002/2050-7038.12996

7. Villar, I., U. Viscarret, I. Etxeberria-Otadui, and A. Rufer, "Transient thermal model of a medium frequency power transformer," 2008 34th Annual Conference of IEEE Industrial Electronics, 1033-1038, 2008, doi: 10.1109/IECON.2008.4758096.
doi:10.1109/IECON.2008.4758096

8. Rashidi, M., N. N. Altin, S. S. Ozdemir, A. Bani-Ahmed, and A. Nasiri, "Design and development of a high-frequency multiport solid-state transformer with decoupled control scheme," IEEE Transactions on Industry Applications, Vol. 55, No. 6, 7515-7526, Nov.-Dec. 2019, doi: 10.1109/TIA.2019.2939741.
doi:10.1109/TIA.2019.2939741

9. Nair, K. R. M., Power and Distribution Transformers: Practical Design Guide, 1st Ed., CRC Press, 2021, https://doi.org/10.1201/9781003088578.
doi:10.1201/9781003088578

10. Petkov, R., "Optimum design of a high-power, high-frequency transformer," IEEE Transactions on Power Electronics, Vol. 11, No. 1, 33-42, Jan. 1996, doi: 10.1109/63.484414.
doi:10.1109/63.484414

11. Guerra, G. and J. A. Martinez-Velasco, "A solid state transformer model for power flow calculations," International Journal of Electrical Power & Energy Systems, Vol. 89, 40-51, 2017, ISSN 0142-0615, https://doi.org/10.1016/j.ijepes.2017.01.005.
doi:10.1016/j.ijepes.2017.01.005

12. Paul, A. K., "Practical study of mixed-core high frequency power transformer," Magnetism, Vol. 2, 306-327, 2022, https://doi.org/10.3390/magnetism2030022.
doi:10.3390/magnetism2030022

13. Fouineau, A., G. Martin, L. Bruno, R. Marie, and S. Fabien, "A medium frequency transformer design tool with methodologies adapted to various structures,", 1, 2020, 10.1109/EVER48776.2020.9243104.

14. Joseph, S., A. K. Abraham, P. H. Raj, J. Joseph, and K. R. M. Nair, "An iterative algorithm for optimum design of high frequency transformer in SST application," IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society, 1538-1543, IEEE, 2020.
doi:10.1109/IECON43393.2020.9254914

15. Abraham, A. K., S. Joseph, K. P. Pinkymol, J. Joseph, and K. R. M. Nair, "Optimum high frequency transformer design using iterative algorithm and validation of the design by finite element analysis method," 2022 IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE), 1-6, 2022, doi: 10.1109/PESGRE52268.2022.9715797.

16. Mogorovic, M. and D. Dujic, "100 kW, 10 kHz medium-frequency transformer design optimization and experimental verification," IEEE Transactions on Power Electronics, Vol. 34, No. 2, 1696-1708, Feb. 2019, doi: 10.1109/TPEL.2018.2835564.
doi:10.1109/TPEL.2018.2835564

17. "Super core Electrical steel sheets for high-frequency application," JFE Steel Corporation, [online] Available: https://www.jfe-steel.co.jp/en/products/electrical/catalog/f1e-002.pdf.

18. "FT-3TL core,", data sheet - Hitachi metals, June 2019.

19. "Powerlite amorphous alloy 2605SA1,", data sheet - Metglas Inc., May 2004.

20. IEC 60076-3 "Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air,", 2013.

21. IEC 60076-1 "Power transformers - Part 1: General,", 2011.

22. Montoya, R. J. G., "High-frequency transformer design for solid-state transformers in electric power distribution systems,", University of Arkansas, 2015.

23. Del Vecchio, R. M., B. Poulin, P. Feghali, D. Shah, and R. Ahuja, Transformer Design Principles: With Applications to Core-form Power Transformers, 2nd Ed., CRC Press, 2010, https://doi.org/10.1201/EBK1439805824.

24. IEC 60076-11 "Power transformers - Part 11: Dry type Transformers,", 2018.

Dr. Sherin Joseph

Dr. Shajimon Kalayil John

Dr. Kudilil Prasad Pinkymol

Dr. Jineeth Joseph

Dr. Kappamadathil Raman Muraleedharan Nair