Improvement of loss of excitation protection of an alternator in the presence of shunt-FACTS – A comprehensive review

Nandkeolyar, Shobhit

doi:10.1016/j.ijepes.2019.105397

Cited by 6 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a synchronous generator (SG) with a similar structure to SC, LOE has always been a research hotspot which has seen a great deal of progress. Besides the reactive power absorption, the LOE SG would be out of step and even lead to system oscillation [18]. Using this asynchronous feature, Yaghobi [19] proposes the most popular criteria based on the impedance technique, for example, the asynchronous limit impedance circle and steady-state stability limit impedance circle, to detect the LOE fault.…”

Section: Introductionmentioning

confidence: 99%

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

Guo

et al. 2020

Energies

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%