Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

Rotor short-circuited start-up strategy for a doubly fed induction machine-fed large-rated variable-speed pumped storage unit operating in pumping mode

  • Malathy Narayanasamy (Department of Electrical and Electronics Engineering, JNN Institute of Engineering, Anna University) ;
  • Y. Sukhi (Department of Electrical and Electronics Engineering, RMK Engineering College, Anna University)
  • Received : 2023.01.24
  • Accepted : 2023.06.01
  • Published : 2023.11.20
⟨ Previous Next ⟩

Abstract

The starting time of a large-rated variable-speed pumped storage unit (PSU) operating in pumping mode is crucial in the power balancing scenario in a modern power system because it establishes the transition period from generation to pumping modes, and vice versa, which determines the power system stability. Doubly fed induction machines (DFIM) are preferred in large-rated variable-speed PSUs (> 100 MW) because they ensure variable-speed operation through partial-rated power converters. Initiating the DFIM in pumping mode is challenging, but it is overcome by utilizing rotor-side power converters. The start-up of DFIM is preferred through short-circuiting the stator windings and supplying power to the rotor windings via power converters. However, this task can be performed through either short-circuiting the rotor or stator windings. This work detailed the field-oriented vector control strategies of the rotor short-circuited method and compared the results with the conventional stator short-circuited method in a commercial 306 MVA DFIM-fed variable-speed PSU. Results demonstrate that short-circuiting the rotor windings reduces the starting time and power consumption by 27.5% and 27%, respectively, compared with the typical starting method. This reduced starting time is preferred by the grid authorities because it improves the power system stability. Furthermore, experimental results are validated in the laboratory with a scaled-down unit of 7.5 kW DFIM.

Keywords

References

  1. Valavi, M., Nysveen, A.: Variable-speed operation of hydropower plants: a look at the past, present, and future. IEEE Ind. Appl. Mag. 24(5), 18-27 (2018)  https://doi.org/10.1109/MIAS.2017.2740467
  2. Koritarov, V., Veselka, T., Gasper, J.: Modeling and analysis of value of advanced pumped storage hydropower in the U.S. In: Argonne Nat. Lab., Lemont, IL, Tech. Rep. (2014) 
  3. Schlunegger, H., Thoni, A.: 100MW full-size converter in the Grimsel 2 pumped-storage plant. Innsbruck, Hydro (2013) 
  4. Christe, A., Faulstich, A., Vasiladiotis, M., Steinmann, P.: World's first fully-rated direct ac/ac MMC for variable-speed pumped-storage hydropower plants. IEEE Trans. Ind. Electron 70, 6898-6907 (2022) 
  5. Bocquel, A., Janning, J. Analysis of a 300MW variable speed drive for pump storage plant applications. In: 14th European Conference on Power Electronics Applications, Dresden, pp. 56-64 (2010) 
  6. Tiwari, R., Nilsen, R., Mo, O.: Control strategies for variable speed operation of pumped storage plants with full-size converter fed synchronous machines. In: IEEE Energy Conversion Congress and Exposition, Vancouver, BC, Canada, pp. 61-68 (2021) 
  7. Kuwabara, T., Shibuya, A., Furuta, H.: Design and dynamic response characteristics of 400 MW adjustable speed pumped storage unit for Ohkawachi Power Station. IEEE Trans. Energy Convers. 11(2), 376-384 (1996)  https://doi.org/10.1109/60.507649
  8. Joseph, A., Desingu, K., Semwal, R.R., Chelliah, T.R., Khare, D.: Dynamic performance of pumping mode of 250 MW variable speed hydro-generating unit subjected to power and control circuit faults. IEEE Trans. Energy Convers. 33(1), 430-441 (2018)  https://doi.org/10.1109/TEC.2017.2739132
  9. Yuan, X., Chai, J., Li, Y.: A converter-based starting method and speed control of doubly fed induction machine with centrifugal loads. IEEE Trans. Ind. Appl. 47(3), 1409-1418 (2011)  https://doi.org/10.1109/TIA.2011.2125937
  10. Pannatier, Y., Kawkabani, B., Nicolet, C., Schwery, A., Simond, J.J.: Start-up and synchronization of a variable speed pump-turbine unit in pumping mode. In: The XIX International Conference on Electrical Machines ICEM 2010, Rome, Italy, pp. 1-6 (2010) 
  11. Pannatier, Y., Kawkabani, B., Nicolet, C., Schwery, A., Simond, J.J.: Optimization of the start-up time of a variable speed pump-turbine unit in pumping mode. In: XXth International Conference on Electrical Machines, Marseille, France, pp. 2126-2132 (2012) 
  12. Joseph, A., Selvaraj, R., Chelliah, T.R., Sarma, S.V.A.: Starting and braking of a large variable speed hydro generating unit subjected to converter and sensor faults. IEEE Trans. Ind. Appl. 54(4), 3372-3382 (2018)  https://doi.org/10.1109/TIA.2018.2816904
  13. Maendly, T., Hodder, A., Kawkabani, B.: Start-up of a varspeed group in pump mode, practical implementations and tests. In: XXII International Conference on Electrical Machines (ICEM), Lausanne, Switzerland, pp. 1201-1207 (2016) 
  14. Mohale, V., Chelliah, T.R., Hote, Y.V.: Analysis and damping of sub-synchronous oscillations in a 250 MW DFIM hydro unit connected to series compensated 765 kV transmission lines. IEEE Trans. Ind. Appl. 59(2), 2234-2245 (2023)  https://doi.org/10.1109/TIA.2022.3221070
  15. Chen, Y., et al.: Small-signal system frequency stability analysis of the power grid integrated with type-II doubly fed variable speed pumped storage. IEEE Trans. Energy Convers. 38(1), 611-623 (2023)  https://doi.org/10.1109/TEC.2022.3207166
  16. Chen, Y.H., Deng, C.H., Zhao, Y.T.: Coordination control between excitation and hydraulic system during mode conversion of variable speed pumped storage unit. IEEE Trans. Power Electron. 36(9), 10171-10185 (2021)  https://doi.org/10.1109/TPEL.2021.3061268
  17. Kumari, R., Prabhakaran, K.K., Desingu, K., Chelliah, T.R., Sarma, S.A.: Improved hydro turbine control and future prospects of variable speed hydropower plant. IEEE Trans. Ind. Appl. 57(1), 941-952 (2020) 
  18. Joseph, A., Chelliah, T.R.: "A review of power electronic converters for variable speed pumped storage plants: Configurations, operational challenges, and future scopes", IEEE. J. Emerg. Sel. Topics Power Electron. 6(1), 103-119 (2018)  https://doi.org/10.1109/JESTPE.2017.2707397
  19. Selvaraj. R, Desingu. K, and Chelliah. T.R, "Fault tolerant operation of parallel-connected 3L-neutral-point clamped back-to-back converters serving to large hydro-generating units," IEEE Trans. Ind. Appl., 54 (5), 5429-5443, (2018).  https://doi.org/10.1109/TIA.2018.2851581
  20. Lung, J.K., Lu, Y., Hung, W.L.: Modeling and dynamic simulations of doubly fed adjustable-speed pumped storage units. IEEE Trans. Energy Convers. 22(2), 250-258 (2007) https://doi.org/10.1109/TEC.2006.875481