Abstract
Due to the expansion of restructured electricity markets and consequently power network operation approaching dynamic and static margins, the probability of transient instability has remarkably been increased. To reduce the transient instability risk or probabilistic cost of power quality, the present study focuses on determining the optimum location of a flux-coupling type SFCL. To this end, the candidate locations with lower related transient instability risk are selected as the best locations for installing flux-coupling type SFCLs. Nowadays, the type of SFCL employed in this study, which enjoys the benefits of both resistive and inductive type SFCLs, is a suitable means for enhancing the transient stability of electrical grids. Despite being another useful approach in transient stability evaluation, the equal-area criterion is merely restricted to the analysis of the stability of a single-machine power system connected to an infinite bus and also a two-machine power system. The online approach employed in this study is based on the corrected transient energy margin (CTEM), some probabilistic factors, and the cost of transient instability. Furthermore, CTEM index is a useful tool for calculating the critical clearing time (CCT). Therefore, in recent years, this index has become more and more useful. The studies carried out on the IEEE New England 39-bus test system ascertain the high applicability of the proposed method.
Highlights
The stability issue is classified into two main groups: transient and steady-state Stabilities
The lines that are near these buses have more influence on reducing the destructive effects of short-circuits on transient performance; with this in mind, only the lines connected to four abovementioned buses are selected as candidate locations for FSFCL placement
For the sake of addressing the costs imposed by transient instability, the transient instability risk index – a novel, quick, and on-line tool for cost-effective decisions – has been employed for optimum placement of a modified FSFCL to increase the system transient stability and decrease the costs of instability
Summary
The stability issue is classified into two main groups: transient and steady-state Stabilities. The transient stability study is generally formed by evaluating rotor synchronization preservation after the occurrence of a fault or transient disturbance. CTEM is a hybrid method, and one of the most appropriate methods for TSA constitutes the basis of calculating transient instability risk in this paper. In this paper, considering the large-scale and multigenerator IEEE New England 39-bus test system, the optimum location of an FSFCL is determined. This novel SFCL approach, which enjoys the useful characteristics of both resistive and inductive SFCLs has been presented recently. The probabilistic approach of this paper is capable of on-line calculation of the transient instability risk of each operating condition.
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