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VSC-HVDC transmission line fault location based on transient characteristics

Zhang Yanxia, Bi Anlu, Wang Jian, Zhang Fuhe, Lu Jingyi

Archives of Electrical Engineering

2021

Vol. 70, nr 2

381--398

Accurate and reliable fault location is necessary for ensuring the safe and reliable operation of the VSC-HVDC transmission system. This paper proposed a single-terminal fault location method based on the fault transient characteristics of the two-terminal VSCH-VDC transmission system. The pole-to-pole transient fault process was divided into three stages, the time-domain expression of the DC current during the diode freewheel stage was used to locate the fault point, and a criterion for judging whether the fault evolves to the diode freewheel stage was proposed. Taking into account the enhancing effect of the opposite system to the fault current, the DC side pole-to-ground fault networkwas equated to a fourth-order circuit model, the relationship of fault distance with the characteristic roots of fault current differential equationwas derived, and the Prony algorithmwas utilized for datafitting to extract characteristic roots to realize fault location. A two-terminal VSC-HVDC transmission system was modelled in PSCAD/EMTDC. The simulation result verifies that the proposed principle can accurately locate the fault point on the VSC-HVDC transmission lines.

A Novel Prony Approach for Synchronous Generator Parameter Estimation

Santana D. M. M, Ferreira N. R, Costa F. F, Lima A. C.

Przegląd Elektrotechniczny

2015

R. 91, nr 1

50-54

In this paper we propose to use a novel Prony’s approach, relying on suitable time-segmentation of current oscillograms and proper model order choice, to estimate transient and sub-transient parameters of synchronous generators associated to sudden three-phase short-circuit tests. Comparison between the proposed approach and a traditional graphical method, described in the IEEE-115 standard, has been performed. The current data used here have been generated from characteristic equations of short-circuit armature current. Based on these results, we conclude that the Prony’s algorithm is a suitable alternative to the graphical method for parameter estimation in synchronous machines, providing more accurate estimates than the later approach.

W artykule zaproponowano system, bazujący na algorytmie Prony, służący do analizy stanów przejściowych w generatorze synchronicznym poddanym testom trójfazowego zwarcia. Porównano tę metodę z tradycyjną metodą bazującą na normie IEEE-115. Algorytm wykorzystujący metodę Prony był bardzie dokładny.