A Semi-Analytical Method for the Identification of DC-Decay Parameters at an Arbitrary Rotor Position in Large Synchronous Machines

Zhenming Lai, Haoyu Kang, Demin Liu (), Zhichao Wang, Yong Yang and Jin Wang
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Zhenming Lai: Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
Haoyu Kang: State Key Laboratory of Advanced Electromagnetic Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Demin Liu: Dongfang Electric Machinery Co., Ltd., Dongfang Electric Corporation, Deyang 618000, China
Zhichao Wang: Dongfang Electric Machinery Co., Ltd., Dongfang Electric Corporation, Deyang 618000, China
Yong Yang: Dongfang Electric Machinery Co., Ltd., Dongfang Electric Corporation, Deyang 618000, China
Jin Wang: State Key Laboratory of Advanced Electromagnetic Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2025, vol. 18, issue 2, 1-14

Abstract: Experimental approaches for the identification of dynamic parameters in synchronous machines mainly include two methods, a three-phase sudden short-circuit (TPSSC) test and a standstill frequency response (SSFR) test. However, the former has significant safety risks, while the latter has a complex implementation process, resulting in insufficient adaptability to large-scale units. To overcome the above obstacles, this paper proposes an improved DC-decay test method that can be performed at an arbitrary rotor position so that the rotor pre-positioning process in the conventional DC-decay test can be neglected. Meanwhile, combining the transient analysis theory and particle swarm optimization algorithm, a semi-analytical parameter identification method is proposed. Finally, the proposed method is applied using a 172 MVA large synchronous machine. Compared to the results obtained by the TPSSC test using the Prony algorithm and other conventional type tests, the error of the parameter calculation results obtained with the conventional method reached a maximum of 16.6%, while that of the proposed method was merely 8.6%, and the experimental period could be shortened from 5 days to half a day.

Keywords: arbitrary rotor position; DC decay; parameter identification; synchronous machine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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