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access icon free Fast predictive technique for reverse power detection in synchronous generator

© The Institution of Engineering and Technology
Received 05/08/2017, Accepted 04/01/2018, Revised 11/12/2017, Published 05/01/2018

Reverse power relays are utilised to trip turbine generators to avoid prime mover damage and directional relay is most widely used as the main protection for these conditions. An intentional time delay is ordinarily utilised to overcome the possible maloperation of these relays. However, the intentional time delay to prevent maloperation is not an ideal solution. As this time delay increases the reverse power relay operation time, which means that the motoring action of the synchronous generator persist for a longer time, making the prime mover more vulnerable to active power drawn by the generator. This study proposes a new flux-based approach to detect reverse power condition in the synchronous generators. The proposed scheme uses the analysis of angular velocity and acceleration data that are calculated from the estimated magnetic flux at the machine stator terminals. The basic idea of the technique stems from the principle that the stator and rotor magnetic fluxes rotate together at synchronous speed and will not be affected by system disturbances for a short interval according to highly inductive characteristics of the synchronous machine. The main advantage of this predictive algorithm is its speed, security and sensitivity to detect the reverse power conditions.

Inspec keywords: synchronous generators; data analysis; stators; magnetic flux; rotors; prediction theory

Other keywords: machine stator terminal; angular velocity data analysis; directional relay; predictive algorithm; synchronous generator; security; turbine generator; fast predictive technique; rotor; synchronous machine; reverse power detection; prime mover damage; stator; acceleration data analysis; reverse power relay operation time; magnetic flux estimation; flux-based approach

Subjects: Synchronous machines

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