Abstract
High-speed auto-reclosing is used in power system protection schemes to ensure the stability and reliability of the transmission system; leader-follower auto-reclosing is one scheme type that is widely used. However, when a leader-follower reclosing scheme responds to a permanent fault that affects a transmission line in the proximity of a generation plant, the reclosing directly impacts the turbine-generator shaft; furthermore, the nature of this impact is dependent upon the selection of the leader reclosing terminal. We therefore analyzed the transient torque of the turbine-generator shaft according to the selection of the leader-follower reclosing end between both ends of the transmission line. We used this analysis to propose an adaptive leader-end reclosing algorithm that removes the stress potential of the transient torque to prevent it from damaging the turbine-generator shaft. We conducted a simulation in actual Korean power systems based on the ElectroMagnetic Transients Program (EMTP) and the Dynamic Link Library (DLL) function in EMTP-RV (Restructured Version) to realize the proposed algorithm.
Highlights
Power system disturbances that are followed by circuit-breaker switching can cause transient phenomena in transmission lines that are located near generation plants, whereby the electromechanical forces in the turbine-generator are changed
A leader-reclosing end selection algorithm for a leader-follower reclosing scheme is is proposed to reduce turbine-generator shaft stress for reclosing into a permanent fault in proposed to reduce turbine-generator shaft stress for reclosing into a permanent fault in transmission transmission lines that are in the proximity of a generation plant
The receiving-end leader reclosing attempt into the permanent fault subjected the turbine-generator to less mechanical stress compared with a sending-end leader reclosing attempt
Summary
Power system disturbances that are followed by circuit-breaker switching can cause transient phenomena in transmission lines that are located near generation plants, whereby the electromechanical forces in the turbine-generator are changed. When reclosing attempt into a permanent fault is inevitable, it is determine In this apaper, we propose a novel protection algorithm that evaluates the necessary preferabletoleader reclosing which leader reclosing end is less harmful to the generator shaft to prevent accumulated shaft stress terminal according to the fault location. We propose a novel protection algorithm that evaluates the necessary preferabletoleader reclosing which leader reclosing end is less harmful to the generator shaft to prevent accumulated shaft stress terminal according to the fault location Through this protection scheme, the turbine-generator can from the transient torque. Korean kV and transmission systems including turbine-generator can avoid potential damage from critical and accumulative transient shaft torque turbine-generators, and assumed two types of permanent fault in a transmission line located in that is caused by the selection of an unsuitable leader end for reclosing into the permanent fault. Influence of the reclosing a novel reclosing algorithm for mitigation turbine generator shaft stress caused endleader on the end turbine-generator-shaft torque is presentedof in the
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