English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This paper proposes a new procedure for out-of-step protection through the combination of a three-impedance element model with equal area criterion. The P   curve of the system is transferred into Pt  curve and then Pt  curve is applied to forecast whether the oscillation between the generator and the power system is out-of-step or stable. The forecasting results determine the operation of the out-of-step protection: If the oscillation is unstable, the signals will be sent during the first period of unstable oscillation, and then the number of sliding pole will be counted to achieve a delay action. Otherwise, no response will be made. A three-machine infinite bus system has been used to test the proposed method by simulation with PSCAD software. The simulations test the protection in a variety of faults within the system, including unstable and stable oscillation, loss of excitation and short-circuit faults. Simulation results confirm that this method can work effectively as a backup protection when faults such as loss of excitation and short-circuit fault are not promptly removed. Moreover, the simulations provide a reliable basis for the scheme and design of out-of-step protection in the power plant.

Out-of-step Protection combining Three-impedance Element Model with the Equal Area Criterion