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© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The use of a Doubly Fed Asynchronous Machine (DFAM) provides attractive characteristics and offers operational flexibility in many variable speed generation applications, such as in a hydroelectric pumped storage plant. In a variable speed hydroelectric pumped storage plant, the start-up process of DFAM is identical to the conventional singly fed asynchronous machine, wherein a significant amount of energy is wasted. This paper introduces an energy-efficient start-up strategy in DFAM based hydroelectric pump-turbine. The back-to-back voltage source converter connected to the rotor side is amenable for speed control (real power), braking (regenerative/dynamic), and starting the unit. Further, in this starting technique, the stator circuit of the machine is injected with a low voltage DC supply at starting instead of short-circuiting the windings. This DC injection reduces the slip losses and cuts down the magnetizing current requirement. The magnitude of the required DC supply is estimated based on the machine’s reactive power requirement. Also, the switching of stator winding between the short circuit connection, DC injection, and grid supply is carried out using a changeover switch and determined by the speed of the rotor. The proposed starting strategy is investigated with 250 MW DFAM in Matlab/Simulink environment and experimented with a 2.2 kW DFAM prototype. Test results show that the proposed starting method can conserve more than 26.1 percent of electrical energy in the example application compared to the conventional V/f start-up strategy.

Details

Title
An Energy-Efficient Start-Up Strategy for Large Variable Speed Hydro Pump Turbine Equipped with Doubly Fed Asynchronous Machine
Author
Rassiah Raja Singh 1   VIAFID ORCID Logo  ; Manickavel Baranidharan 1 ; Subramaniam, Umashankar 2   VIAFID ORCID Logo  ; Mahajan, Sagar Bhaskar 2   VIAFID ORCID Logo  ; Rangarajan, Shriram S 3 ; Abdelsalam, Hany A 4   VIAFID ORCID Logo  ; Collins, Edward Randolph 5 ; Senjyu, Tomonobu 6   VIAFID ORCID Logo 

 Advanced Drives Laboratory, Department of Energy and Power Electronics, Vellore Institute of Technology, Vellore 632014, India; [email protected] (R.R.S.); [email protected] (M.B.) 
 Renewable Energy Laboratory, College of Engineering, Prince Sultan University, Riyadh 11586, Saudi Arabia; [email protected] (U.S.); [email protected] (M.S.B.) 
 Department of Electrical and Electronics Engineering, SR University, Warangal 506001, India; [email protected]; Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634, USA 
 Department of Electrical Engineering, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt; [email protected] 
 Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634, USA 
 Department of Electrical and Electronics Engineering, University of the Ryukyus, Nishihara 903-0213, Okinawa, Japan; [email protected] 
First page
3138
Publication year
2022
Publication date
2022
Publisher
MDPI AG
e-ISSN
19961073
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2663003639
Copyright
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.