Synchronous Condenser’s Loss of Excitation and Its Impact on the Performance of UHVDC

Zhilin Guo, Liangliang Hao, Junyong Wu, Xingguo Wang, Hong Cao and Guang Wang
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Zhilin Guo: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Liangliang Hao: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Junyong Wu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Xingguo Wang: State Key Laboratory for Power Grid Safety and Energy Conservation (China Electric Power Research Institute), Beijing 100192, China
Hong Cao: State Key Laboratory for Power Grid Safety and Energy Conservation (China Electric Power Research Institute), Beijing 100192, China
Guang Wang: Nari Electric Co., Ltd., Nanjing 211102, China

Energies, 2020, vol. 13, issue 18, 1-16

Abstract: The synchronous condenser (SC) has a broad application prospect in ultra-high-voltage direct current (UHVDC) systems. The SC’s loss of excitation (LOE) is an important grid-related fault that may cause damage to the UHVDC. However, as the premise of the scientific protection configuration, knowledge of the SC’s LOE feature and its impact on UHVDC is still missing. This article first analyzes the SC’s LOE feature, offering a basic cognition of this fault. Secondly, the LOE SC’s reactive power response to system voltage variation is studied in the single-machine infinite-bus system. This lends a foundation for transient UHVDC research. Finally, the LOE SC’s impacts on steady and transient UHVDC are evaluated, respectively, considering different AC strengths and system faults through PSCAD/EMTDC (V4.6, Manitoba HVDC Research Center, Winnipeg, MB, Canada) simulations. The results show that: (1) LOE the SC absorbs reactive power while maintaining synchronous operation, its excitation current declines monotonically; (2) the LOE SC has an insignificant effect on steady-state UHVDC; (3) the LOE SC can restrain the overvoltage and benefit the rectifier’s transient stability; and (4) to reduce the inverter’s commutation failure, keeping LOE SC is more effective than separating it beforehand, while separating the LOE SC after the system voltage drop performs best. These conclusions could provide insights for the protection’s criterion and operation mode selections.

Keywords: UHVDC; dynamic reactive power; synchronous condenser; loss of excitation; commutation failure (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: 2020
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