A new method for mitigation of power oscillations with fast reclosing of transmission lines based on SIME

Abstract

The high voltage (HV) and Extra High Voltage (EHV) lines could be reestablished by auto-reclosing operation of transmission switches automatically after a certain time from the first tripping during fault. Successful reclosing is carried out considering a dead time which is usually chosen based on the quenching time of possible secondary arc. However, this is not enough to guarantee the transient and dynamic stability of the system. The reclosing instant is the key factor in acceleration or deceleration of power oscillations, and should be determined carefully to ensure the stability of the system. Power oscillations can be mitigated by adaptive selection of the dead time. In this paper, a new method for dead time calculation is proposed in order to mitigate power oscillations effectively. The proposed method is also capable of utilizing in on-line identification because of low amount of calculation required. In this algorithm, single machine infinite bus equivalent (SIME) method is used for evaluation of power oscillations.