Journal Articles (All Issues)

Abstract

The variations caused by the distributed generation (DG) results in fast changes in the overall load composition and have a significant impact on the power response during voltage fluctuations. The Smart Transformer is a power electronic based distribution transformer accompanied with advanced control technologies that can analyze the dependence of load on voltage for improving the quality of power supplied to the transmission and distribution grids. The high control capability of the smart transformers makes it an ideal choice for optimizing the power flow management and control of the DG system. The deployment of smart transformers enables the control of voltage in the DC bus and thereby manages the system operation under fault occurrences. During faults, the smart transformer can swiftly reduce the voltage which is in phase and thereby ensures the safety of the DC bus and can operate with other phases to prevent interruption with faulty phases. However, the effects of harmonics in the DC voltage reduces the lifespan of the capacitors and increases the flow of high current in the system. These issues can be mitigated by increasing the maintenance of the smart transformer in order to prevent dynamic faults in the system. This paper presents a flexible control strategy for smart transformers based on DG in a DC bus. The performance of the proposed approach is evaluated in terms of load power, PV power, wind power, fuel cell power and power transfer between grid and the transformer.

References

1. Rezaei, F., &Esmaeili, S. (2017). Decentralized reactive power control of distributed PV and wind power generation units using an optimized fuzzy-based method. International Journal of Electrical Power & Energy Systems, 87, 27-42. 2. Lakshmi, S., &Ganguly, S. (2018). Simultaneous optimisation of photovoltaic hosting capacity and energy loss of radial distribution networks with open unified power quality conditioner allocation. IET Renewable Power Generation, 12(12), 1382-1389. 3. Lakshmi, S., &Ganguly, S. (2019). An on-line operational optimization approach for open unified power quality conditioner for energy loss minimization of distribution networks. IEEE Transactions on Power Systems, 34(6), 4784-4795. 4. Dehghani, M., Montazeri, Z., & Malik, O. P. (2020). Optimal sizing and placement of capacitor banks and distributed generation in distribution systems using spring search algorithm. International Journal of Emerging Electric Power Systems, 21(1). 5. Abdel-mawgoud, H., Kamel, S., Ebeed, M., & Youssef, A. R. (2017, December). Optimal allocation of renewable dg sources in distribution networks considering load growth. In 2017 Nineteenth International Middle East Power Systems Conference (MEPCON) (pp. 1236-1241). IEEE. 6. Pegado, R., Ñaupari, Z., Molina, Y., & Castillo, C. (2019). Radial distribution network reconfiguration for power losses reduction based on improved selective BPSO. Electric Power Systems Research, 169, 206-213. 7. Ahmed, M., Meegahapola, L., Vahidnia, A., &Datta, M. (2020). Stability and control aspects of microgrid architectures–a comprehensive review. IEEE access, 8, 144730-144766. 8. Rosso, R., Wang, X., Liserre, M., Lu, X., &Engelken, S. (2021). Grid-forming converters: Control approaches, grid-synchronization, and future trends—A review. IEEE Open Journal of Industry Applications, 2, 93-109. 9. Sarfi, V., &Livani, H. (2020). Optimal Volt/VAR control in distribution systems with prosumer DERs. Electric Power Systems Research, 188, 106520. 10. Liang, B., Kang, L., He, J., Zheng, F., Xia, Y., Zhang, Z., ...& Zhao, Y. (2019). Coordination control of hybrid AC/DC microgrid. The Journal of Engineering, 2019(16), 3264-3269. 11. Yoo, H. J., Nguyen, T. T., & Kim, H. M. (2019). Consensus-based distributed coordination control of hybrid AC/DC microgrids. IEEE Transactions on Sustainable Energy, 11(2), 629-639. 12. Liang, X. (2016). Emerging power quality challenges due to integration of renewable energy sources. IEEE Transactions on Industry Applications, 53(2), 855-866. 13. Kumar, C., Zhu, R., Buticchi, G., &Liserre, M. (2017). Sizing and SOC management of a smart-transformer-based energy storage system. IEEE Transactions on Industrial Electronics, 65(8), 6709-6718. 14. Gao, X., Sossan, F., Christakou, K., Paolone, M., &Liserre, M. (2017). Concurrent voltage control and dispatch of active distribution networks by means of smart transformer and storage. IEEE Transactions on Industrial Electronics, 65(8), 6657-6666. 15. Zhu, R., Andresen, M., Langwasser, M., Liserre, M., Lopes, J. P., Moreira, C., ...& Couto, M. (2020). Smart transformer/large flexible transformer. CES Transactions on Electrical Machines and Systems, 4(4), 264-274. 16. Liserre, M., Buticchi, G., Andresen, M., De Carne, G., Costa, L. F., & Zou, Z. X. (2016). The smart transformer: Impact on the electric grid and technology challenges. IEEE Industrial Electronics Magazine, 10(2), 46-58. 17. Hrishikesan, V. M., Deka, A. K., & Kumar, C. (2020). Capacity enhancement of a radial distribution grid using smart transformer. IEEE Access, 8, 72411-72423. 18. Giacomuzzi, S., Langwasser, M., De Carne, G., Buja, G., &Liserre, M. (2020). Smart transformer-based medium voltage grid support by means of active power control. CES Transactions on Electrical Machines and Systems, 4(4), 285-294. 19. Gupta, A., Doolla, S., & Chatterjee, K. (2017). Hybrid AC–DC microgrid: Systematic evaluation of control strategies. IEEE Transactions on Smart Grid, 9(4), 3830-3843. 20. Zou, Z. X., De Carne, G., Buticchi, G., &Liserre, M. (2017). Smart transformer-fed variable frequency distribution grid. IEEE Transactions on Industrial Electronics, 65(1), 749-759. 21. Gabbar, H. A., & Sayed, K. (2016, August). Smart distribution system Volt/VAR control using the intelligence of smart transformer. In 2016 IEEE Smart Energy Grid Engineering (SEGE) (pp. 52-56). IEEE. 22. Costa, L. F., De Carne, G., Buticchi, G., &Liserre, M. (2017). The smart transformer: A solid-state transformer tailored to provide ancillary services to the distribution grid. IEEE Power Electronics Magazine, 4(2), 56-67. 23. Zou, Z. X., De Carne, G., Buticchi, G., &Liserre, M. (2016, March). Frequency adaptive control of a smart transformer-fed distribution grid. In 2016 IEEE Applied Power Electronics Conference and Exposition (APEC) (pp. 3493-3499). IEEE. 24. De Carne, G., Buticchi, G., Liserre, M., &Vournas, C. (2018). Real-time primary frequency regulation using load power control by smart transformers. IEEE Transactions on Smart Grid, 10(5), 5630-5639. 25. Hrishikesan, V. M., & Kumar, C. (2020, October). Smart transformer based meshed hybrid microgrid with mvdc interconnection. In IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society (pp. 4961-4966). IEEE. 26. Chen, J., Liu, M., De Carne, G., Zhu, R., Liserre, M., Milano, F., & O'Donnell, T. (2021). Impact of smart transformer voltage and frequency support in a high renewable penetration system. Electric Power Systems Research, 190, 106836. 27. Kumar, C., Manojkumar, R., Ganguly, S., &Liserre, M. (2021). Impact of optimal control of distributed generation converters in smart transformer based meshed hybrid distribution network. IEEE Access, 9, 140268-140280. 28. AbdelHady, R. (2017). Modeling and simulation of a micro grid-connected solar PV system. Water Science, 31(1), 1-10. 29. Fara, L., &Craciunescu, D. (2017). Output analysis of stand-alone PV systems: modeling, simulation and control. Energy Procedia, 112, 595-605.